327 results on '"Waldo AL"'
Search Results
2. Time domain analysis of the signal averaged electrocardiogram in patients with a conduction defect or a bundle branch block
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Gatzoulis, KA Carlson, MD Biblo, LA Rizos, I Gialafos, J and Toutouzas, P Waldo, AL
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cardiovascular system ,cardiovascular diseases - Abstract
Doubts have been expressed about the clinical usefulness of time domain analysis of the signal averaged electrocardiogram in patients with prolonged QRS complex duration. We studied 147 patients using a signal averaged ECG (40-250 Hz) whose QRS complex was longer than 100 ms. A baseline electrophysiology study was also performed in 128 of these patients. Seventy-seven patients had a minor (QRS < 120 and > 100 ms) conduction defect. Thirty-seven of these 77 had either induced or spontaneous sustained ventricular tachycardia (group I) and 40 had no sustained ventricular tachycardia (group II). Seventy patients had a major (QRS greater than or equal to 120 ms) conduction defect, 44 of whom had sustained ventricular tachycardia (group A). The remaining 26 without this condition formed Group B. Group I compared to group II patients had a longer filtered QRS duration (120.8 +/- 14 vs 104.5 +/- 9.5 ms, P < 0.001), a longer low amplitude signal duration (41 +/- 12.1 vs 31 +/- 12.6 ms, P < 0.0001) and a lower root mean square of the last 40 ms of the filtered QRS complex (27 +/- 29.8 vs 35 +/- 25.3 mu V, P = ns). Group A compared to group B had a longer filtered QRS duration (157.7 +/- 20.2 vs 140.7 +/- 15.7 ms, P < 0.001), a longer low amplitude signal duration (57.3 +/- 24.9 vs 37.8 +/- 20.3 ms P < 0.001) and a lower root mean square of the last 40 ms of the filtered QRS complex (14.3 +/- 11.2 vs 22.0 +/- 10.5 mu V, P < 0.01). Using conventional late potential criteria, the sensitivity and specificity of the signal averaged ECG for the detection of sustained ventricular tachycardia patients with a minor conduction defect were 89% and 75%, respectively. The same criteria applied to patients with a major conduction defect were sensitive (sensitivity: 87%) but non-specific (specificity: 50%). However, by using modified late potential criteria, such as the presence of two of any of the following three signal averaged parameters: filtered QRS duration greater than or equal to 145 ms, low amplitude signal duration greater than or equal to 50 ms, root mean square of the last 40 ms of the filtered QRS complex less than or equal to 17.5 mu V, we derived a non-optimal but still acceptable combination of sensitivity (68%) and specificity (73%). We conclude that traditional late potential criteria can be applied in patients with a minor conduction defect, but modification of these criteria is necessary to derive useful clinical information for risk stratification of patients with a QRS complex duration greater than or equal to 120 ms.
- Published
- 1995
3. Catheter Ablation for Cardiac Arrhythmias, Personnel, and Facilities
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SCHEINMAN, MELVIN M., primary, AKHTAR, MASOOD, additional, DREIFUS, LEONARD, additional, EVANS, G. THOMAS, additional, GILLETTE, PAUL, additional, HUANG, S.K. STEPHEN, additional, JACKMAN, WARREN, additional, LANGBERG, JONATHAN J., additional, MALONEY, JAMES, additional, MORADY, FRED, additional, RUSKIN, JEREMY, additional, SAKSENA, SANJEEV, additional, WALDO, AL, additional, and ZIPES, DOUGLAS, additional
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- 1992
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4. Cardioversion: past, present, and future.
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Cakulev I, Efimov IR, Waldo AL, Cakulev, Ivan, Efimov, Igor R, and Waldo, Albert L
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- 2009
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5. Frequency analysis of atrial electrograms identifies conduction pathways from the left to the right atrium during atrial fibrillation - studies in two canine models.
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Ryu K, Sahadevan J, Khrestian CM, Stambler BS, and Waldo AL
- Abstract
Studies of atrial fibrillation (AF) have demonstrated that a stable rhythm of very short cycle length in the left atrium (LA) can cause fibrillatory conduction in the rest of the atria. We tested the hypothesis that fast Fourier transform (FFT) analysis of atrial electrograms (AEGs) during this AF will rapidly and reliably identify LA-to-right atrium (RA) conduction pathway(s) generated by the driver. Methods and Results: During induced atrial tachyarrhythmias in the canine sterile pericarditis and rapid ventricular pacing-induced congestive heart failure models, 380-404 AEGs were recorded simultaneously from epicardial electrodes on both atria. FFT analysis of AEGs during AF demonstrated a dominant frequency peak in the LA (driver), and multiple frequency peaks in parts of the LA and the most of the RA. Conduction pathways from the LA driver to the RA varied from study-to-study. They were identified by the presence of multiple frequency peaks with one of the frequency peaks at the same frequency as the driver, and traveled (1) inferior to the inferior vena cava (IVC); (2) between the superior vena cava and the right superior pulmonary vein (RSPV); (3) between the RSPV and the right inferior pulmonary vein (RIPV); (4) between the RIPV and the IVC; and (5) via Bachmann's bundle. Conduction pathways identified by FFT analysis corresponded to the conduction pathways found in classical sequence of activation mapping. Computation time for FFT analysis for each AF episode took less than 5 minutes. Conclusion: FFT analysis allowed rapid and reliable detection of the LA-to-RA conduction pathways in AF generated by a stable and rapid LA driver. [ABSTRACT FROM AUTHOR]
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- 2009
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6. ACC/AHA/Physician Consortium 2008 clinical performance measures for adults with nonvalvular atrial fibrillation or atrial flutter: a report of the American College of Cardiology/American Heart Association Task Force on Performance Measures and the Physician Consortium for Performance Improvement (Writing Committee to Develop Clinical Performance Measures for Atrial Fibrillation): developed in collaboration with the Heart Rhythm Society.
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Estes NA 3rd, Halperin JL, Calkins H, Ezekowitz MD, Gitman P, Go AS, McNamara RL, Messer JV, Ritchie JL, Romeo SJ, Waldo AL, Wyse DG, and American College of Cardiology/American Heart Association Task Force on Performance Measures
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- 2008
7. Use of fast fourier transform analysis of atrial electrograms for rapid characterization of atrial activation-implications for delineating possible mechanisms of atrial tachyarrhythmias.
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Ryu K, Sahadevan J, Khrestian CM, Stambler BS, and Waldo AL
- Abstract
INTRODUCTION: Different analysis techniques have been developed to help understand and characterize the mechanisms responsible for atrial arrhythmias. We tested the hypothesis that Fast Fourier Transform (FFT) analysis of recorded atrial electrograms (AEGs) will rapidly and accurately identify regular and irregular patterns of atrial activation, and, thereby, may provide evidence suggestive of underlying mechanisms of atrial tachyarrhythmias. METHODS AND RESULTS: During induced atrial tachyarrhythmias in both the canine sterile pericarditis model and canine rapid ventricular pacing-induced congestive heart failure model; 380-404 AEGs were recorded simultaneously from epicardial electrodes on both atria. From AEGs, atrial activation sequences were determined during atrial flutter (AFL), focal atrial tachycardia (AT), and atrial fibrillation (AF). Four-second recording segments of each AEG were subjected to FFT analysis. Frequencies found during FFT analyses in all studies precisely corresponded to the cycle lengths of the AEGs. In AFL and AT, one dominant frequency peak was found throughout both atria. In AF due to multiple unstable reentry circuits, multiple and broad frequency peaks were found in both atria. In AF due to a stable rapid rhythm (driver) in the left atrium with fibrillatory conduction to the rest of the atria, one dominant frequency peak in areas with 1:1 conduction from the driver, and multiple and/or broad frequency peaks in areas with fibrillatory conduction produced by the driver were found. Computation time for all FFT analyses took <5 minutes. CONCLUSION: FFT analysis accurately and rapidly identifies global atrial activation patterns during AFL, AT, and AF, thereby assisting in determining arrhythmia mechanisms. [ABSTRACT FROM AUTHOR]
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- 2006
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8. Role of permanent pacing to prevent atrial fibrillation: Science Advisory from the American Heart Association Council on Clinical Cardiology (Subcommittee on Electrocardiography and Arrhythmias) and the Quality of Care and Outcomes Research Interdisciplinary Working Group, in collaboration with the Heart Rhythm Society.
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Knight BP, Gersh BJ, Carlson MD, Friedman PA, McNamara RL, Strickberger SA, Tse HF, Waldo AL, and American Heart Association Writing Group
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- 2005
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9. A cardiac potential mapping system
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Thomas, Cacil W., primary, Laurita, Kenneth, additional, Sun, Gang, additional, Liebman, Jerome, additional, and Waldo, Al L., additional
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- 1990
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10. Epicardial mapping of chronic atrial fibrillation in patients: preliminary observations.
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Sahadevan J, Ryu K, Peltz L, Khrestian CM, Stewart RW, Markowitz AH, and Waldo AL
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- 2004
11. Lessons learned from the AFFIRM Trial -- treatment of patients with atrial fibrillation at risk for stroke.
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Waldo AL
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- 2004
12. 'Incessant' atrioventricular (AV) reciprocating tachycardia utilizing left lateral av bypass pathway with a long retrograde conduction time.
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Okumura K, Henthorn RW, Epstein AE, Plumb VJ, and Waldo AL
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Two patients with incessant or nearly incessant episodes of atrioventricular (AV) reciprocating tachycardia were studied and were found to he unique because of the location of a slowly conducting retrograde AV bypass pathway in the left lateral position. During the tachycardia in hath patients, negative P waves were present not only in ECG leads II, in, and aVF, but also in leads I and aVL. The R-P'/P'-R ratios were 1.3 and 1.9, respectively. Cardiac electrophysiologic study revealed that in both tachycardias, retrograde ventriculoatrial conduction occurred utilizing a concealed left lateral AV bypass pathway with a long conduction time. Verapamil prolonged conduction over the AV bypass pathway in both patients. One patient was successfully treated with oral verapamil. The other patient underwent successful surgical interruption of the AV bypass pathway. [ABSTRACT FROM AUTHOR]
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- 1986
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13. Subclinical atrial fibrillation and the risk of stroke.
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Bersohn MM, Waldo AL, Halperin JL, Bersohn, Malcolm M, Waldo, Albert L, and Halperin, Jonathan L
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- 2012
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14. Do not stop the warfarin until.
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Cakulev I and Waldo AL
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- 2010
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15. TECHNICAL AND ECONOMICAL ASSESSMENT OF CORN, GRAIN SORGHUM AND MILLET IN SINGLE CROP AND INTERCROPPING MANAGEMENT WITH Urochloa ruziziensis
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WALDO ALEJANDRO RUBEN LARA-CABEZAS and SANDRO ROBERTO BRANCALIÃO
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total operating cost ,leaf analysis ,conversion efficiency of N-fertilizer ,break-even point ,Plant culture ,SB1-1110 ,Agriculture (General) ,S1-972 - Abstract
This work aimed to perform a technical-economic evaluation of the grain production of maize, sorghum and millet, in single-crop and intercropped management systems with Urochloa ruziziensis. The experiment was carried using a randomized blocks design in triplicate, with of six treatments: 1) sorghum single-crop/millet single-crop/maize single-crop (SSC/MILSC/MSC); 2) maize single-crop/sorghum single-crop/millet single-crop (MSC/SSC/MILSC);3) millet single-crop/maize single-crop/sorghum single-crop (MILSC/MSC/SSC); 4) resting/maize intercropped/grass (R/MIC/G); 5) resting/sorghum intercropping/grass (R/SIC/G) and 6) resting/millet intercropping/grass (R/MILIC/G).The variables evaluated were dry matter (DM), rates of production and decomposition, extraction of nutrients byplant shoots, grain yield, harvest index (HI) and conversion efficiency of N-fertilizer (CENF). The final result of totalDM produced after the off-season production in 2008 was, in descending order: MILSC/MSC/SSC > SSC/ MILSC/MSC = R/ MIC/G > MSC/SSC/MILSC = R/SIC/G = R/MILIC/G. No difference in yield was observed between themanagement systems in the 2007/2008 season. Millet had the lowest HI among the grasses and CENF presentedascending order for maize, millet and sorghum.
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- 2012
16. MANAGEMENT OF SOLE AND INTERCROPPED GRASS CROPS WITH Brachiaria ruziziensis AND EFFICIENCY OF SIDEDRESS NITROGEN
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WALDO ALEJANDRO RUBEN LARA-CABEZAS
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Zea mays ,Sorghum bicolor ,Pennisetum americanum ,15N-ammonium sulfate. ,Plant culture ,SB1-1110 ,Agriculture (General) ,S1-972 - Abstract
This work aimed to quantify the efficiency of N-recovered from ammonium sulfate (AS) applied to thegrasses grown on an exclusive basis in sidedressing, to evaluate the performance of maize, pearl millet and sorghumin single-crop and intercropped management systems with Brachiaria ruziziensis, and dry matter production of bothmanagement systems. An experiment was carried out at the Polo Regional Noroeste Paulista, located in Votuporanga, SãoPaulo State, Brazil, during the 2007/2008 season in a moderate eutrophic Argisol of sandy texture. The experiment wasset up in randomized blocks design, in triplicate, consisting of six treatments (crop-management). Each replicate consistedof seven 15 m long plant rows. The efficiency of the N-recovered from AS applied at a rate of 80 kg.ha-1 N split in twoequal times in grasses managed exclusively, grain yield and production of dry matter at.harvest of single and intercroppedgrasses were evaluated. The millet was more efficient in recovering the N-AS compared to maize and sorghum at the firstpart of nitrogen fertilization, being similar for all three grasses after applying the second parcel. The largest proportionof fertilizer-N was observed in shoots of millet and grains in maize. On the other hand, sorghum showed a similardistribution between shoots and grains. Grain yield of maize, millet and sorghum was not affected by the intercroppingwith pasture. Crops with greater plant growth (maize and millet) inhibited the development of B. ruziziensis. The lowestvegetative growth of sorghum favored the highest dry matter yield of the pasture. The management of the intercroppingeffectively increases the soil covering, important in regions with dry autumn/winter.
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- 2011
17. Sulfato de amônio e uréia em cobertura no milho em semeadura direta no Cerrado
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Anderson Lange, Waldo Alejandro Ruben Lara Cabezas, and Paulo César Ocheuze Trivelin
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Zea mays ,pré-semeadura ,N recuperado na planta ,épocas de aplicação ,Agriculture (General) ,S1-972 ,Biotechnology ,TP248.13-248.65 - Abstract
A aplicação de nitrogênio no milho de forma antecipada, tanto na semeadura da planta de cobertura como em pré-semeadura pode otimizar os trabalhos dentro da propriedade. Objetivou-se avaliar a influência nas concentrações foliares e produtividade de grãos do milho do parcelamento do nitrogênio suplementar à semeadura em área de dois anos de soja, em solo de textura média e quantificar a recuperação do nitrogênio do sulfato de amônio e da úreia, utilizando a técnica da diluição isotópica (15N). Os tratamentos constaram da aplicação de 110 kg ha-1 de nitrogênio em épocas distintas: na semeadura do milheto -5 dias antes da semeadura do milho -em cobertura, quando as plantas tinham 5-7 folhas; -e em cobertura quando as plantas tinham 9-10 folhas. Há diferença de produtividade de grãos e concentrações foliares de nitrogênio, fósforo, cálcio e enxofre quando se aplica nitrogênio suplementar à semeadura em diferentes épocas em relação a ausência de fertilização. O parcelamento de 110 kg ha-1 entre pré-semeadura e cobertura ou apenas na cobertura não altera a recuperação total do fertilizante. A recuperação do nitrogênio do sulfato de amônio aplicado em cobertura é maior quando comparada à uréia, sendo ainda que o parcelamento de sulfato de amônio em cobertura apresenta maior recuperação em relação ao fornecimento em uma única aplicação.
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- 2010
- Full Text
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18. La problematización profesional de las disciplinas como vía para lograr la motivación hacia el estudio en las Sedes Universitarias Municipales
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Ariel Díaz Loaces, Waldo Alles Rodríguez, Yanelbys Miranda Camejo, and Camilo Barrios Morejón
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Sports ,GV557-1198.995 - Abstract
El presente artículo tiene el propósito de dar a conocer una alternativa metodológica basada en la problematización profesional de las disciplinas, que conforman el plan de estudio de las carreras, para contribuir a lograr la motivación hacia el estudio, de los estudiantes universitarios formados en las Sedes Universitarias Municipales. Como primera línea de trabajo y atendiendo a las dificultades que se han presentado, se decidió montarlo, primeramente, en las carreras de Ciencias Pedagógicas. Unas de las dificultades más acuciantes que tienen hoy las Sedes Universitarias Municipales es la poca motivación hacia el estudio que tienen los estudiantes de las distintas carreras pedagógicas La alternativa metodológica en cuestión consta de 5 etapas, que describen de manera precisa las acciones de los docentes y de los estudiantes, en aras de apropiarse del contenido de las disciplinas a partir de la problematización profesional de estas. La idea esencial que sigue la investigación es que la problematización profesional de las disciplinas puede ser una vía para incentivar la motivación hacia el estudio. Esta investigación se encuentra en fase preliminar, pero se espera que una vez concluida, aporte una posible vía de solución a la falta de motivación hacia el estudio de los estudiantes de Carreras Pedagógicas, elevando los resultados cuantitativos y cualitativos en los parámetros de eficacia y eficiencia de estas.
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- 2009
19. PRODUCTIVITY OF STRAW AND CORN IN NO TILLAGE SYSTEM ACCORDING TO THE TIME OF NITROGEN FERTILIZER IN CORN
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ANDERSON LANGE, WALDO ALEJANDRO RUBEN LARA CABEZAS, and PAULO CÉSAR OCHEUZE TRIVELIN
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black oat ,nutrient cycling ,soil cover ,Plant culture ,SB1-1110 ,Agriculture (General) ,S1-972 - Abstract
Strategies aiming to increase straw production by crops should be implemented in the Cerrado region in order to consolidate no-tillage cultivation. The objective of the present work was to evaluate the effect of time and splitting of supplementary nitrogen application to maize (in addition to the N-fertilization at seeding) on straw production and several yield components of black oat, a spontaneous native species. Treatments consisted of applying 70 kg ha-1 nitrogen in addition to maize fertilization at seeding, at distinct times: at black-oat seeding; 8 days before corn seeding; in covering in plants in the phases of 4-5 leaves and 6-7 leaves. At seeding, 42 kg N.ha-1 were applied in all plots. The nitrogen fertilization applied at oat seeding did not cause increase in out-of-season straw productivity. An increase in maize straw production was observed with nitrogen supply in addition to fertilization at seeding as well as the application closer to seeding resulted in an increased straw production when compared to fertilization at oat seeding.
- Published
- 2009
20. Volatilização de amônia, lixiviação de nitrogênio e produtividade de milho em resposta à aplicação de misturas de uréia com sulfato de amônio ou com gesso agrícola Ammonia volatilization, leaching of nitrogen and corn yield in response to the application of mix of urea and ammonium sulphate or gypsum
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Waldo Alejandro Ruben Lara Cabezas and Marcos André Souza
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cobertura nitrogenada ,qualidade de produção ,relação N:S foliar ,relação N:S parte aérea ,eficiência de fertilizante ,enxofre ,side-dress fertilization ,production quality ,N:S leaf ratio ,N:S shoots ratio ,fertilizer efficiency ,sulphur ,Agriculture (General) ,S1-972 - Abstract
A adubação em cobertura na cultura de milho, assim como de outras culturas anuais, deve incluir N e S para acrescentar qualidade protéica à produção de grãos. Este trabalho foi desenvolvido na safra 2004/2005, na cultura de milho, na Fazenda Floresta do Lobo - Pinusplan, BR 050, km 93, município de Uberlândia (MG). O estudo foi realizado em Latossolo Vermelho ácrico típico fase Cerrado subcaducifólio muito argiloso (720 g kg-1), objetivando: quantificar as perdas por volatilização de N-NH3 provenientes de algumas das misturas de grânulos utilizadas em cobertura nitrogenada na cultura de milho; determinar a distribuição, até 60 cm de profundidade de solo, do N-mineral (NH4+ e NO3-) e S-SO4(2-) após 37 e 51 dias da aplicação dos adubos em cobertura; e avaliar o efeito na produtividade de milho da aplicação de misturas de grânulos, com diferentes granulometrias e relações N:S, em relação à aplicação exclusiva, em cobertura nitrogenada, de uréia (U) e sulfato de amônio (SA). Foram instalados 11 tratamentos de adubação N:S:K em cobertura, no estádio de 5-6 folhas, em dose de 90 kg ha-1 de N, nas formas exclusivas de U e SA, em misturas físicas de U+SA granulado (U+SAgr), U+SA farelado (U+SAfa), U+Gesso granulado (U+Gesso gr) e U+Gesso em pó (U+Gesso pó), em delineamento de blocos casualizados. As perdas gasosas de N-NH3 foram em ordem decrescente, em relação ao N aplicado: U 76,8 %; U+SA Gr 37,9 %; U+SAfa 27,7 % e SAfa 7,8 %. Os teores de N-amônio e N-nitrato no solo, após 37 dias da aplicação das misturas, mostraram-se similares à testemunha (menos N), evidenciando que o N fornecido via fertilizante foi em parte absorvido pela cultura, nitrificado, lixiviado e, ou, adsorvido em maior profundidade. Aos 51 dias após a aplicação das misturas, o teor de N-mineral total do solo, estava mais evidente nas camadas de 20 a 40 cm de profundidade, indicando lixiviação de N das camadas mais superficiais. Nos tratamentos com aplicação de apenas U ou SA, essa tendência foi mais atenuada. Quanto ao S-sulfato, a camada mais superficial apresentou os menores teores em todos os tratamentos, diminuindo ainda mais na camada de 0 a 10 cm, após os 37 e 51 dias da aplicação dos fertilizantes. Os teores de S-sulfato continuaram expressivos nas camadas mais profundas. No estádio de florescimento, a análise de nutrientes na folha oposta à espiga não mostrou diferença significativa na relação N:S, assim como na parte aérea da planta. As maiores produtividades foram alcançadas pelos tratamentos de U+SAfa e U+Gesso gr, respectivamente: 10.285 kg ha-1 e 10.241 kg ha-1 de grãos. Os tratamentos com maiores produtividades ocorreram com a aplicação da U em mistura com SAfa, SAgr e Gesso gr, nas relações N:S entre 2,75 e 4,0. Esses resultados permitem concluir que a aplicação de S em cobertura pode ser realizada misturando-se U com SA ou U com Gesso gr, embora esta última tenha apresentado perdas de NH3 mais significativas.The side-dressing fertilization of annual crops should consider S, beside N and K, in order to add protein value to the crop production. This work was carried out in the crop year 2004/2005, in the Farm Floresta do Lobo - Pinusplan, located at the km 93 of BR 050 highway, in the county of Uberlândia (MG). The experiment was installed in ácric Red Latossol typical Cerrado phase clayed (720 g kg-1), with the following objectives: to measure the losses by volatilization of NH3-N from some of the used mixtures at side-dressing in corn crop; to evaluate the distribution down to 60 cm deep, of mineral-N (NH4+-N and NO3--N) and SO4(2-)-S after 37 and 51 days of the side-dressing; and evaluate the effect on the corn yield, of granulated mixtures with different particles sizes and N:S ratios, in relation to urea (U) and ammonium sulphate (AS) exclusives. Eleven treatments in randomized blocs design of N:S:K fertilizers were used in side-dressing, in the corn stage of 5-6 leaves, in the rate of 90 kg ha-1 of N, as exclusive U or AS, or mixtures of U+AS granulated (U+ASgr) and U+AS with different size particles (U+ASfa) and U+Gypsum granulated (U+Gypsum gr) and U+Gypsum powder (U+Gypsum powder). The more significant gas losses of NH3-N were in decrecent order: U exclusive 76.8 % followed by U+ASgr 37,9 %; U+Gypsum gr 27.7 % and ASfa exclusive (7.8 %). The concentration of ammonium-N and nitrate-N after 37 days of the fertilizer application was similar to the control (without N), demonstrating that the N supplied by the fertilizers were assimilated by the crop, nitrified, leached and, or, adsorbed more deeply. The sulphate-S, at the superficial layer presented the lower concentration in all treatments, reducing its concentration in the layer of 0 to 10 cm, and the 37 to 51 days of the fertilizer applied. After 51 days of the mixtures application, the concentration of total mineral-N was more expressive in the layers of 20 and 40 cm deep, demonstrating the leaching of N from the superficial layers. In the treatments with exclusive application of U and AS this tendency was weaker. In general it had greater ratio of the nitrate-N that of ammonium-N in the total mineral-N in the analyzed layers. In relation to sulphate-S, was expressive increasing the concentration in deeper layers. In stage of flowering, the analysis of nutrients in the leaf opposite the spike showed no significant difference in the ratio N:S leaf, and, this relationship in the shoots of the plant. The highest yields were reached by the treatments of U+ASfa and U+Gypsum gr: 10.285 and 10.241 kg ha-1 of grains, respectively. The treatments with higher yields were the ones with U+ASfa or AS+Gypsum gr with the N:S ratios between 2,75 to 4,00. These results allow to conclude that the application of sulphur as side-dressing is necessary and it can be done by mixing U with AS or U and Gypsum gr, although this later one have presented significant higher NH3 losses.
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- 2008
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21. Utilização de uréia em misturas com sulfato de amônio ou com gesso na cultura de milho Use of urea in mix with ammonium sulfate or gypsum in the culture of corn
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Waldo Alejandro Ruben Lara Cabezas, Carlos Ribeiro Rodrigues, Suelen Martins de Oliveira, and Elias Nascentes Borges
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mistura de grânulos ,cobertura nitrogenada ,volatilização de N-NH3 ,granulated mixtures ,side-dressing ,NH3-N volatilization ,Agriculture (General) ,S1-972 - Abstract
Aspectos qualitativos e quantitativos devem ser considerados na adubação nitrogenada de cobertura na cultura de milho. Este estudo teve por objetivo avaliar, nos municípios de Votuporanga (SP) e Uberlândia (MG), o efeito de diferentes misturas de grânulos, contendo N e S, na produtividade de milho. Em um Argissolo Vermelho eutrófico A moderado textura arenosa (120 g kg-1 de argila) de Votuporanga, foram estimadas as perdas por volatilização de N-NH3, das misturas de grânulos constituídas por uréia (U) e sulfato de amônio (SA), ou U e gesso agrícola, aplicadas no primeiro parcelamento de cobertura nitrogenada. Em Uberlândia, em Latossolo Vermelho ácrico típico fase Cerrado subcaducifólio muito argiloso (720 g kg-1), foram determinados a distribuição de N-inorgânico e S-sulfato em profundidade, após a aplicação das misturas em cobertura, e os custos de aplicação dessas fontes. Os experimentos foram instalados em delineamento de blocos casualizados, com quatro repetições, e as misturas de grânulos aplicadas em superfície, na entre linha de cultivo. Em Votuporanga, foram acompanhados dois experimentos: safra 2005/2006 e safrinha 2006. Na safra de 2005/2006, foram comparados quatro tratamentos de cobertura: testemunha, sem N, uréia+sulfato de amônio farelado (U+SAfa), uréia+gesso granulado (U+Gesso gr) e uréia+gesso em pó (U+Gesso pó), aplicados em dois parcelamentos de 45 kg ha-1 de N cada, nos estádios de cinco a seis folhas e 12 a 13 folhas. As perdas de N-NH3 volatilizado em função do N aplicado foram de 45,9, 56,6 e 61,1 % das misturas U+SAfa, U+Gesso pó e U+Gesso gr, respectivamente. A produtividade de grãos não mostrou diferença significativa entre os tratamentos, sendo, em média, de 5.362 kg ha-1. Na safrinha, uréia+sulfato de amônio granulado (U+SAgr) foi incluído nos tratamentos. Neste experimento, as misturas de grânulos foram aplicadas em doses de 50 kg ha-1 de N cada, em cobertura, nos estádios de três a quatro folhas e seis a sete folhas. A produtividade de grãos foi similar entre as fontes de U+SA e U+Gesso, sendo em média de 5.332 kg ha-1. Em Uberlândia, foram comparados os cinco tratamentos testados no experimento - safrinha de Votuporanga. As misturas de grânulos foram aplicadas em dose única de 90 kg ha-1 de N, no estádio de quatro a cinco folhas. Os maiores teores de N-mineral total foram detectados na camada de 0 a 10 cm de profundidade, em todos os tratamentos (abaixo de 3 mg dm-3), diminuindo em profundidade, enquanto o S-sulfato concentrou-se entre as camadas de 10 a 60 cm. Os tratamentos de U+Gesso e U+SA apresentaram, em média, produtividades de 11.364 e 10.300 kg ha-1 de grãos, respectivamente. O custo de aplicação de U+Gesso gr foi 27,7 % superior aos custos médios de aplicação de U+SAgr e U+SAfa, devido a seu menor teor de N, e 7,8 % superior em relação aos custos diretos totais por hectare. A mistura NK com aplicação posterior de U+Gesso pó apresentou custo de aplicação similar ao da U+Gesso gr, devido à dupla operação de aplicação do primeiro. Os resultados em ambas as regiões permitem concluir que o milho respondeu de forma similar à aplicação em cobertura das fontes mistas, U+SA e U+Gesso, independentemente da granulometria dos produtos, e que os custos de aplicação das formas U+Gesso foram superiores aos das misturas U+SA.Qualitative and quantitative aspects must be considered in the side-dressing fertilization in the cultivation of corn. This study aimed to evaluate in the counties of Votuporanga (SP) and Uberlândia (MG), the effect on productivity of corn using different mixtures of granules in the side-dressing fertilization, containing nitrogen (N) and sulphur (S). In Votuporanga (SP), in an Argisol (120 g kg-1 of clay) were estimated losses through volatilization of NH3-N granules mix consisting of urea (U) + ammonium sulfate (AS) or U + Gypsum applied in the first split of nitrogen application. In Uberlândia (MG) in ácric Red Latossol typical Cerrado phase clayed (720 g kg-1), was given the distribution of N- and S-inorganic sulphate in depth, after application the granules mix, and assessment of the costs of implementing these sources. The experiments were installed in randomized block design with four repetitions, and granules mix applied to surface in between the row of plants. In Votuporanga (SP), were installed two experiments: first crop 2005/2006 and second-crop 2006. In the first crop, four treatments of side-dressing were compared: zero NSK, urea+ammonium sulphate with different particles size (U+ASfa), urea+gypsum granulated (U+Gypsum gr) and urea+gypsum powder (U+Gypsum powder), applied in two times of 45 kg ha-1 of N each, in the respective stages of five to six leaves and 12 to 13 leaves. The losses of NH3-N were 45.9, 56.6 and 61.1 % of the N-applied in the forms U+ASfa, U+Gypsum powder and U+Gypsum gr, respectively. In spite of the losses of U+ASfa to be inferior to the other two sources, the productivity didn't show significant difference among those treatments, being on average of 5.362 kg ha-1. In the second crop, the treatment urea+ammonium sulphate granule (U+ASgr) was included. The formulations were applied in N doses of 50 kg ha-1 each, in the stages of four and six to seven leaves, respectively. The grain productivity was similar between the sources of U+AS and U+Gypsum, being on average of 5.332 kg ha-1. In Uberlândia (MG), the same treatments as in second crop of Votuporanga (SP) were compared. The formulations were applied N in a single dose of 90 kg ha-1 of N in the corn stage of four to five leaves. The distribution of total mineral-N and sulphate-S were evaluated in depth until 60 cm, 30 days after the application of the formulations in side-dressing. The largest concentrations of total mineral-N were detected in the layer of 0-10 cm for all of the treatments (below 3 mg dm-3), decreasing in depth; however the sulfate-S was more concentrated among the layers of 10 down to 60 cm. The treatments of U+Gypsum presented the largest productivities, on average of 11.364 kg ha-1, in relation to the sources of U+AS (10.300 kg ha-1). The cost of application of U+Gypsum gr was 27,7 % superior for the mean costs of application of U+ASgr and U+ASfa, due to the smallest concentration of nitrogen and 7,8 % superior in relation to the total direct costs for hectare. The cost of application in relation to total cost of NK formulated with subsequent application of gypsum powder (U+Gypsum powder) was similar to U+Gypsum gr, due to the higher production cost and the duplication of application handling. The results of both areas allow to conclude that the corn response was similar for the side-dressing of the mixed sources of U+AS and U+Gypsum, independently of the particle size and in soils of different texture, and that the costs of application of the forms urea+Gypsum, were superior to the formulated mixtures U+AS.
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- 2008
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22. Recuperação do nitrogênio das fontes sulfato e nitrato de amônio pelo milho em sistema semeadura direta Recovery of nitrogen from ammonium sulfate and nitrate by corn crop in no-tillage system
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Anderson Lange, Waldo Alejandro Ruben Lara Cabezas, and Paulo César Ocheuze Trivelin
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Glycine max ,Zea mays ,épocas de aplicação ,nitrogênio recuperado na planta ,pré-semeadura ,application date ,plant nitrogen recovery ,pre-seeding ,Agriculture (General) ,S1-972 - Abstract
O objetivo deste trabalho foi avaliar a influência das épocas de parcelamento do nitrogênio suplementar à semeadura, nas concentrações foliares e na produtividade de grãos do milho, cultivado após dois anos de soja, e quantificar a recuperação do nitrogênio do fertilizante, pela técnica da diluição isotópica (15N). Os tratamentos constaram da aplicação de 70 kg ha-1 de nitrogênio, como dose suplementar à adubação de semeadura do milho em épocas distintas: na semeadura da aveia-preta; oito dias antes da semeadura do milho; em cobertura, quando as plantas tinham quatro a cinco folhas; e em cobertura quando as plantas tinham sete a oito folhas. Não há diferença para as concentrações foliares e produtividade de grãos, quando se aplica nitrogênio suplementar à adubação de semeadura ou não, independentemente da época de aplicação, após o cultivo de soja por dois anos, em área de sistema semeadura direta. A recuperação do nitrogênio é superior no compartimento planta inteira, quando aplicado em cobertura, em relação à aplicação em pré-semeadura. O parcelamento do nitrogênio em cobertura não melhora a recuperação do fertilizante em relação a uma única aplicação.The objective of this work was to evaluate the influence of different timing of nitrogen split application during corn crop seeding, on nutrient concentration of leaves and on corn yield, after two years of soybean cultivation; and to quantify the recovery of nitrogen fertilizer using the isotopic dilution technique (15N). Treatments consisted of 70 kg ha-1 nitrogen application at corn crop seeding in distinct times: during seeding of oat, before corn seeding (8 days), at corn broadcasting (4-5 leaves), and at corn broadcasting (7-8 leaves). There is no difference for leaf nutrient concentrations and productivity of corn, after nitrogen supplementation at corn crop seeding, independently of application timing, after two years of soybean cultivation in no-tillage system. Nitrogen recovery is higher in the compartment plant, when applied in coverage, compared to the applied before corn seeding. The split application of nitrogen in coverage does not improve the recovery of fertilizer in a single application.
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- 2008
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23. Imobilização de nitrogênio da uréia e do sulfato de amônio aplicado em pré-semeadura ou cobertura na cultura de milho, no sistema plantio direto Nitrogen immobilization of urea and ammonium sulphate applied to maize before planting or top-dressing in a no-till system
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Waldo Alejandro Ruben Lara Cabezas and Pedro Afonso Couto
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biomassa de solo ,isótopo 15N ,razão N fertilizante planta/N fertilizante imobilizado ,N-imobilizado-N mineralizado ,soil biomass ,15N isotope ,ratio of fertilizer-N in plant /immobilized fertilizer-N ,N-immobilized N, mineralized N ,Agriculture (General) ,S1-972 - Abstract
No segundo ano de estudo, sulfato de amônio (SA) e uréia (U) marcados com 15N foram aplicados na cultura do milho, em sucessão à aveia-preta (Avena strigosa Schieb.), no sistema plantio direto, 33 dias antes e 10 dias depois da semeadura, na dose de 80 kg ha-1 de N, incorporados a 5-7 cm de profundidade, em sulcos espaçados de 0,8 m, nas entrelinhas do milho. O objetivo foi quantificar o N dos fertilizantes imobilizado no solo (15N orgânico), no sulco de adubação, e o N recuperado na planta nos estádios de 4-5 folhas, 11-12 folhas, florescimento e colheita. O delineamento experimental foi de blocos casualizados, efetuando-se a análise de variância em esquema fatorial 2 x 6 em pré-semeadura (duas fontes, U e SA, em seis épocas de amostragem) e 2 x 3 (duas fontes em três épocas de amostragem) em cobertura, com três repetições. O experimento foi realizado em Latossolo Vermelho ácrico típico fase Cerrado subcaducifólio, na Fazenda Floresta do Lobo - Pinusplan, em Uberlândia (MG). Na aplicação em pré-semeadura, a máxima imobilização foi observada aos 22 dias da aplicação do SA (9,1 kg ha-1 ou 11,4 % do N aplicado) e aos 11 dias da aplicação da U (46,5 kg ha-1 ou 58,1 % do N aplicado). Até a colheita, a planta (parte aérea, grãos e raiz) acumulou 66,0 e 47,9 kg ha-1 de N-SA e N-U, respectivamente, correspondendo à eficiência de absorção de 82,5 e 59,9 % do N aplicado. Na aplicação em cobertura, a imobilização do N fertilizante das duas fontes foi inferior a 12,5 % do N aplicado, em todas as fases de crescimento da planta, evidenciando que a biomassa do solo não concorreu com a planta pelo N fertilizante, sendo similar à quantificação realizada na safra 1999/2000. Na média das duas safras (1999/2001) e dos estádios de 11-12 folhas e florescimento, para cada kg de N fertilizante imobilizado, as plantas de milho absorveram 8,9 e 15,4 kg ha-1 de N-SA, em pré-semeadura e cobertura, respectivamente. Para N-U, esses valores foram, respectivamente, de 4,5 e 5,2 kg ha-1, mostrando menor proporção de N-imobilizado de SA, com a aplicação dos fertilizantes em cobertura. As produtividades de grãos obtidas com SA e U, independentemente da época de aplicação, foram de 8.543 e 7.767 kg ha-1, respectivamente. Na adubação em pré-semeadura do milho, o SA apresentou maior rapidez na ciclagem do N imobilizado-mineralizado (turnover), em relação a U, e, conseqüentemente, causou maior absorção do N pela cultura, como verificado na safra anterior. Em cobertura, no sulco de adubação, de forma similar à observada na safra anterior, somente houve imobilização significativa do N-U, retardando sua absorção pela planta.Ammonium sulfate (AS) and urea (U), labeled with 15N, were applied to no-till maize, 33 days before and 10 days after sowing, at a single rate of 80 kg ha-1 of N incorporated 5-7 cm deep along furrows spaced 0.8 m. Corn was sown after black oat (Avena strigosa Schieb.).The amount of immobilized N and of N-fertilizer recovered by corn plants was evaluated at the following plants stages: 4-5 leaves, 11-12 leaves, flowering, and at harvest. Treatments were applied in a randomized block design with three replications. The analysis of variance was performed based on one factorial scheme (2 x 6) with two sources in pre-planting (AS and U) on six sampling dates, and on a second (2 x 3) with two sources in top-dressing on three sampling dates. This field experiment was carried out on a Typic Acrustox in Uberlandia, Minas Gerais state, Brazil. Pre-planting applications resulted in a maximal AS-N immobilization 22 days after fertilizer application (9.1 kg ha-1 or 11.4 % of applied N), whereas the maximum immobilization of U-N occurred 11 days after fertilizer application (46.5 kg ha-1 or 58.1 % of applied N). Until harvest, the plants (aerial part, grains and roots) had accumulated 66.0 and 47.9 of AS-N and U-N, respectively (use efficiency of 82.5 and 59.9 % of applied N). N top-dressing resulted in 12.5 % less N immobilized applied as both sources in all growth stages, evidencing that the soil biomass did not compete with the plants for N-fertilizer, in agreement with results of the growing season 1999/2000. In both growing seasons (1999/2000 and 2000/2001) corn plants assimilated an average 8.9 and 15.4 kg ha-1 of AS-N for each kg of immobilized N-fertilizer from pre-planting and top-dressing, respectively, in the stage of 11-12 leaves and at flowering. For U-N these values were 4.5 and 5.2 kg ha-1, respectively, presenting a lower ratio of immobilized AS-N in top-dressing. Highest corn yields were obtained in the AS treatments (mean grain yield of 8.543 kg ha-1) independent of the application time. Urea treated plants obtained average grain yields of 7.767 kg ha-1 for both application periods. These results show that for pre-planting fertilizers the immobilization-mineralization N turnover was faster in the AS than in the U-N treatment. Consequently, N assimilation by corn plants was higher in the AS treatments. Only U-N was significantly immobilized more also in the second growing season when top-dressed, thus limiting plant N uptake.
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- 2007
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24. COMBINATION OF PROCAINAMIDE AND ATRIAL-PACING FOR SUCCESSFUL CONVERSION OF ATRIAL-FLUTTER TO SINUS RHYTHM
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Brian Olshansky, Okumura, K., Henthorn, Rw, Epstein, Ae, Plumb, Vj, and Waldo, Al
25. PATHOLOGICAL AND CLINICAL OBSERVATIONS AFTER CATHETER FULGURATION IN MAN
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Henthorn, Rw, Cohen, Md, Anderson, Pg, Epstein, Ae, Plumb, Vj, Brian Olshansky, and Waldo, Al
26. EFFECT OF THE ANTIARRHYTHMIC AGENT MORICIZINE ON SURVIVAL AFTER MYOCARDIAL-INFARCTION
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ROGERS, WJ, EPSTEIN, AE, ARCINIEGAS, JG, CROSSLEY, GH, DAILEY, SM, KAY, GN, LITTLE, RE, MACLEAN, WAH, PAPAPIETRO, SE, PLUMB, VJ, SILBER, S, BAKER, AR, CARLISLE, K, COHEN, N, COX, M, THOMAS, C, LEVSON, L, VONHAGEL, D, WALTON, AE, PRATT, CM, MAHMARIAN, J, MORRIS, G, CAPONE, RJ, BERGER, EE, CHMIELEWSKI, C, GORKIN, L, KHAN, AH, KORR, K, HANDSHAW, K, CONNOLLY, E, FITZPATRICK, D, CAMERON, T, WYSE, DG, DUFF, HJ, MITCHELL, LB, GILLIS, AM, WARNICA, JW, SHELDON, RS, LESOWAY, NR, KELLEN, J, HALE, C, INKSTER, M, BRODSKY, M, WOLFF, L, ALLEN, B, ZELMAN, R, THOMAS, G, CAUDILLO, G, TAKEDA, D, SHERWOOD, C, RANAZZI, R, RAPAPORT, E, DOHRMANN, ML, RASKIN, S, DREW, DW, SOMELOFSKI, CA, DANFORTH, JW, HUI, PY, JOHNSON, MR, LABARCA, JR, WALDO, AL, CARLSON, MD, ADLER, DS, HOLLAND, JB, BUCHTER, CM, BAHLER, RC, PAMELIA, FX, JOSEPHSON, RA, HENTHORN, RW, ZUELGARAY, JG, WOOD, K, REDMON, P, VARGAS, MA, VARGO, L, SCHALLER, SE, KOBUS, CE, CHOBAN, NL, BIGGER, JT, GREENBERG, HM, GREGORY, JJ, HOCHMAN, JS, RADOSLOVICH, G, STEINBERG, JS, ROTHBART, ST, CASE, R, DWYER, EM, SQUATRITO, A, KELLY, M, CAMPION, JM, TORMEY, D, ANTHONY, R, CALLAGHAN, E, CHAPNICK, M, RIPLEY, B, FONTANA, C, SCHLANT, RC, ARENSBERG, D, CORSO, JA, HURST, JW, MORRIS, DC, SHERMAN, SW, SILVERMAN, BD, SILVERMAN, ME, ROBERTS, JS, BALLOU, SK, JEFFRIES, VD, BRACKNEY, BA, SEALS, AA, HARTLEY, J, BAKER, RM, GILMOUR, KE, BAKER, SB, HOWARD, J, KATZ, RJ, BESCH, GA, BRILL, D, DIBIANCO, R, DONOHUE, D, FISHER, G, FRANCIS, C, FRIEDMAN, D, GOLDBERG, D, GOLDBERG, S, KOSS, G, LARCA, L, LEONARD, R, LINDGREN, K, RONAN, J, ROSENBLATT, A, ROSING, D, ROSS, A, ROTSZTAIN, A, SHAWL, F, SINDERSON, T, STEVENSON, R, TINKER, B, VARGHESE, J, YACKEE, J, BIGHAM, H, FRANKLIN, W, GOLD, R, GRAHAM, G, GROSSBERG, D, HOARE, R, LEVY, W, MAHMOOD, T, TANNENBAUM, E, TULLNER, W, EISENHOWER, E, GERACI, T, WILHELMSEN, L, BERGSTRAND, R, FREDLUND, BO, SIGURDSSON, A, SIVERTSSON, R, SWEDBERG, K, HOULTZ, B, WIKLUND, I, SCHLYTER, G, HEDELIN, G, LEIJON, M, MORGANROTH, J, CARVER, J, HOROWITZ, L, KUTALEK, S, PAPA, L, SANDBERG, J, VICTOR, M, CESARE, S, VRABEL, C, TALARICO, K, LUHMANN, S, PALAZZO, D, GOLDSTEIN, S, GOLDBERG, AD, FRUMIN, H, WESTVEER, D, DEBUTLIER, M, SCHAIRER, J, STOMEL, R, FRANK, DM, JARANDILLA, R, DAVEY, D, HASSE, C, SHINNEY, S, MORLEDGE, JH, FARNHAM, DJ, HINDERACKER, PH, MUSSER, WE, DEVRIES, K, KUSHNER, JA, RAO, R, PETERSON, DT, MCCAULEY, CS, BERGEN, TS, BOWMAN, KO, GILLMAN, A, FULLER, L, OBRIEN, J, MORLEDGE, J, DEMARIA, AN, KUO, CS, KAMMERLING, JM, CORUM, J, THIEMANN, M, SCHRODT, R, PETERS, R, SUTTON, F, GOTTLIEB, S, PAPUCHIS, G, MATTIONI, T, TODD, L, CUSACK, C, SCHECK, J, HUANG, SKS, ALPERT, JS, GORE, JM, RYAN, M, COLLETTWILLEY, P, CHAHINE, RA, SEQUEIRA, RF, LOWERY, MH, DELGADO, LM, CORREA, JL, LASO, LJ, HODGES, M, SALERNO, D, ANDERSON, B, COLLINS, R, DENES, P, DUNBAR, D, GRANRUD, G, HAUGLAND, J, HESSION, W, MCBRIDE, J, GORNICK, C, SIMONSON, J, TOLINS, M, ETTINGER, A, PETERSON, S, SLIVKEN, R, GRIMALDI, L, ROY, D, THEROUX, P, LEMERY, R, MORISSETTE, D, BEAUDOIN, D, GIRARD, L, LAVALLEE, E, MCANULTY, JH, REINHART, SE, MAURICE, G, MURPHY, ES, KRON, J, MARCHANT, C, BOXER, J, PRINCEHOUSE, L, SINNER, K, BEANLANDS, D, DAVIES, R, GREEN, M, WILLIAMS, W, BAIRD, MJ, GARRARD, L, HEAL, S, HASPECT, A, BORTHWICK, J, MAROIS, L, WOODEND, K, AKIYAMA, T, HOOD, WB, EASLEY, R, RYAN, G, KENIEN, G, PATT, M, KAZIERAD, D, GOLDFARB, A, BUTLER, LL, KELLER, ML, STANLEY, P, PEEBLES, J, SYROCKI, D, LAVIN, D, SCHOENBERGER, JA, LIEBSON, PR, STAMATO, NJ, PETROPULOS, AT, BUCKINGHAM, TA, REMIJAS, T, KOCOUREK, J, JANKO, K, BARKER, AH, ANDERSON, JL, FOWLES, RE, KEITH, TB, WILLIAMS, CB, MORENO, FL, DORAN, EN, FOWLER, B, SUMMERS, K, WHITE, C, OHARA, G, ROULEAU, JL, PLANTE, S, VINCENT, C, BOUCHARD, D, ZOBLE, RG, OTERO, JE, BUGNI, WJ, SCHWARTZ, KM, SHETTIGAR, UR, BREWINGTON, JA, UMBERGER, J, COHEN, JD, BJERREGAARD, P, HAMILTON, WP, GARNER, M, ANDERSON, S, ELSHERIF, N, URSELL, SN, GABOR, GE, IBRAHIM, B, ASSADI, M, BREZSNYAK, ML, PORTER, AV, STANIORSKI, A, WOOSLEY, RL, RODEN, DM, CAMPBELL, WB, ECHT, DS, LEE, JT, MURRAY, KT, SPELL, JD, BONHOTAL, ST, JARED, LL, THOMAS, TI, GOLDNER, F, RICHARDSON, DW, ROMHILT, DW, ELLENBOGEN, KA, BANE, BB, FIELDS, J, SHRADER, S, POWELL, E, CHAFFIN, CF, WELLS, A, CONWAY, KT, PLATIA, EV, ODONOGHUE, S, TRACY, CM, ALI, N, BOWEN, P, BROOKS, KM, OETGEN, W, WESTON, LT, CARSON, P, OBIASMANNO, D, HARRISON, J, SAYLOR, A, POWELL, S, HAAKENSON, CM, SATHER, MR, MALONE, LA, HALLSTROM, AP, MCBRIDE, R, GREENE, HL, BROOKS, MM, LEDINGHAM, R, REYNOLDSHAERTLE, RA, HUTHER, M, SCHOLZ, M, MORRIS, M, FRIEDMAN, LM, SCHRON, E, VERTER, J, JENNINGS, C, PROSCHAN, M, BRISTOW, JD, DEMETS, DL, FISCH, C, NIES, AS, RUSKIN, J, STRAUSS, H, WALTERS, L, ROGERS, WJ, EPSTEIN, AE, ARCINIEGAS, JG, CROSSLEY, GH, DAILEY, SM, KAY, GN, LITTLE, RE, MACLEAN, WAH, PAPAPIETRO, SE, PLUMB, VJ, SILBER, S, BAKER, AR, CARLISLE, K, COHEN, N, COX, M, THOMAS, C, LEVSON, L, VONHAGEL, D, WALTON, AE, PRATT, CM, MAHMARIAN, J, MORRIS, G, CAPONE, RJ, BERGER, EE, CHMIELEWSKI, C, GORKIN, L, KHAN, AH, KORR, K, HANDSHAW, K, CONNOLLY, E, FITZPATRICK, D, CAMERON, T, WYSE, DG, DUFF, HJ, MITCHELL, LB, GILLIS, AM, WARNICA, JW, SHELDON, RS, LESOWAY, NR, KELLEN, J, HALE, C, INKSTER, M, BRODSKY, M, WOLFF, L, ALLEN, B, ZELMAN, R, THOMAS, G, CAUDILLO, G, TAKEDA, D, SHERWOOD, C, RANAZZI, R, RAPAPORT, E, DOHRMANN, ML, RASKIN, S, DREW, DW, SOMELOFSKI, CA, DANFORTH, JW, HUI, PY, JOHNSON, MR, LABARCA, JR, WALDO, AL, CARLSON, MD, ADLER, DS, HOLLAND, JB, BUCHTER, CM, BAHLER, RC, PAMELIA, FX, JOSEPHSON, RA, HENTHORN, RW, ZUELGARAY, JG, WOOD, K, REDMON, P, VARGAS, MA, VARGO, L, SCHALLER, SE, KOBUS, CE, CHOBAN, NL, BIGGER, JT, GREENBERG, HM, GREGORY, JJ, HOCHMAN, JS, RADOSLOVICH, G, STEINBERG, JS, ROTHBART, ST, CASE, R, DWYER, EM, SQUATRITO, A, KELLY, M, CAMPION, JM, TORMEY, D, ANTHONY, R, CALLAGHAN, E, CHAPNICK, M, RIPLEY, B, FONTANA, C, SCHLANT, RC, ARENSBERG, D, CORSO, JA, HURST, JW, MORRIS, DC, SHERMAN, SW, SILVERMAN, BD, SILVERMAN, ME, ROBERTS, JS, BALLOU, SK, JEFFRIES, VD, BRACKNEY, BA, SEALS, AA, HARTLEY, J, BAKER, RM, GILMOUR, KE, BAKER, SB, HOWARD, J, KATZ, RJ, BESCH, GA, BRILL, D, DIBIANCO, R, DONOHUE, D, FISHER, G, FRANCIS, C, FRIEDMAN, D, GOLDBERG, D, GOLDBERG, S, KOSS, G, LARCA, L, LEONARD, R, LINDGREN, K, RONAN, J, ROSENBLATT, A, ROSING, D, ROSS, A, ROTSZTAIN, A, SHAWL, F, SINDERSON, T, STEVENSON, R, TINKER, B, VARGHESE, J, YACKEE, J, BIGHAM, H, FRANKLIN, W, GOLD, R, GRAHAM, G, GROSSBERG, D, HOARE, R, LEVY, W, MAHMOOD, T, TANNENBAUM, E, TULLNER, W, EISENHOWER, E, GERACI, T, WILHELMSEN, L, BERGSTRAND, R, FREDLUND, BO, SIGURDSSON, A, SIVERTSSON, R, SWEDBERG, K, HOULTZ, B, WIKLUND, I, SCHLYTER, G, HEDELIN, G, LEIJON, M, MORGANROTH, J, CARVER, J, HOROWITZ, L, KUTALEK, S, PAPA, L, SANDBERG, J, VICTOR, M, CESARE, S, VRABEL, C, TALARICO, K, LUHMANN, S, PALAZZO, D, GOLDSTEIN, S, GOLDBERG, AD, FRUMIN, H, WESTVEER, D, DEBUTLIER, M, SCHAIRER, J, STOMEL, R, FRANK, DM, JARANDILLA, R, DAVEY, D, HASSE, C, SHINNEY, S, MORLEDGE, JH, FARNHAM, DJ, HINDERACKER, PH, MUSSER, WE, DEVRIES, K, KUSHNER, JA, RAO, R, PETERSON, DT, MCCAULEY, CS, BERGEN, TS, BOWMAN, KO, GILLMAN, A, FULLER, L, OBRIEN, J, MORLEDGE, J, DEMARIA, AN, KUO, CS, KAMMERLING, JM, CORUM, J, THIEMANN, M, SCHRODT, R, PETERS, R, SUTTON, F, GOTTLIEB, S, PAPUCHIS, G, MATTIONI, T, TODD, L, CUSACK, C, SCHECK, J, HUANG, SKS, ALPERT, JS, GORE, JM, RYAN, M, COLLETTWILLEY, P, CHAHINE, RA, SEQUEIRA, RF, LOWERY, MH, DELGADO, LM, CORREA, JL, LASO, LJ, HODGES, M, SALERNO, D, ANDERSON, B, COLLINS, R, DENES, P, DUNBAR, D, GRANRUD, G, HAUGLAND, J, HESSION, W, MCBRIDE, J, GORNICK, C, SIMONSON, J, TOLINS, M, ETTINGER, A, PETERSON, S, SLIVKEN, R, GRIMALDI, L, ROY, D, THEROUX, P, LEMERY, R, MORISSETTE, D, BEAUDOIN, D, GIRARD, L, LAVALLEE, E, MCANULTY, JH, REINHART, SE, MAURICE, G, MURPHY, ES, KRON, J, MARCHANT, C, BOXER, J, PRINCEHOUSE, L, SINNER, K, BEANLANDS, D, DAVIES, R, GREEN, M, WILLIAMS, W, BAIRD, MJ, GARRARD, L, HEAL, S, HASPECT, A, BORTHWICK, J, MAROIS, L, WOODEND, K, AKIYAMA, T, HOOD, WB, EASLEY, R, RYAN, G, KENIEN, G, PATT, M, KAZIERAD, D, GOLDFARB, A, BUTLER, LL, KELLER, ML, STANLEY, P, PEEBLES, J, SYROCKI, D, LAVIN, D, SCHOENBERGER, JA, LIEBSON, PR, STAMATO, NJ, PETROPULOS, AT, BUCKINGHAM, TA, REMIJAS, T, KOCOUREK, J, JANKO, K, BARKER, AH, ANDERSON, JL, FOWLES, RE, KEITH, TB, WILLIAMS, CB, MORENO, FL, DORAN, EN, FOWLER, B, SUMMERS, K, WHITE, C, OHARA, G, ROULEAU, JL, PLANTE, S, VINCENT, C, BOUCHARD, D, ZOBLE, RG, OTERO, JE, BUGNI, WJ, SCHWARTZ, KM, SHETTIGAR, UR, BREWINGTON, JA, UMBERGER, J, COHEN, JD, BJERREGAARD, P, HAMILTON, WP, GARNER, M, ANDERSON, S, ELSHERIF, N, URSELL, SN, GABOR, GE, IBRAHIM, B, ASSADI, M, BREZSNYAK, ML, PORTER, AV, STANIORSKI, A, WOOSLEY, RL, RODEN, DM, CAMPBELL, WB, ECHT, DS, LEE, JT, MURRAY, KT, SPELL, JD, BONHOTAL, ST, JARED, LL, THOMAS, TI, GOLDNER, F, RICHARDSON, DW, ROMHILT, DW, ELLENBOGEN, KA, BANE, BB, FIELDS, J, SHRADER, S, POWELL, E, CHAFFIN, CF, WELLS, A, CONWAY, KT, PLATIA, EV, ODONOGHUE, S, TRACY, CM, ALI, N, BOWEN, P, BROOKS, KM, OETGEN, W, WESTON, LT, CARSON, P, OBIASMANNO, D, HARRISON, J, SAYLOR, A, POWELL, S, HAAKENSON, CM, SATHER, MR, MALONE, LA, HALLSTROM, AP, MCBRIDE, R, GREENE, HL, BROOKS, MM, LEDINGHAM, R, REYNOLDSHAERTLE, RA, HUTHER, M, SCHOLZ, M, MORRIS, M, FRIEDMAN, LM, SCHRON, E, VERTER, J, JENNINGS, C, PROSCHAN, M, BRISTOW, JD, DEMETS, DL, FISCH, C, NIES, AS, RUSKIN, J, STRAUSS, H, and WALTERS, L
27. Imobilização de nitrogênio da uréia e do sulfato de amônio aplicado em pré-semeadura ou cobertura na cultura de milho, no sistema plantio direto Nitrogen immobilization of urea and ammonium sulphate applied to maize before planting and as top-dressing in a no-till system
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Waldo Alejandro Ruben Lara Cabezas, Murilo Rodrigues de Arruda, Heitor Cantarella, Volnei Pauletti, Paulo Cesar Ocheuze Trivelin, and Jose Albertino Bendassolli
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N-recuperado na planta ,fenologia do milho ,isótopo 15N ,razão N fertilizante planta ,plant N-recovery ,phenology of corn plants ,15N isotope ,rate of plant N- fertilizer ,Agriculture (General) ,S1-972 - Abstract
Sulfato de amônio (SA) e uréia (U) marcados com 15N foram aplicados na cultura do milho, em sucessão à aveia preta (Avena strigosa Schieb.), no sistema plantio direto, 43 dias antes e 31 dias depois da semeadura, na dose de 80 kg ha-1 de N, incorporados a 5-7 cm de profundidade, em sulcos espaçados de 0,8 m, nas entrelinhas do milho. O objetivo foi quantificar o N dos fertilizantes imobilizado no solo (15N-orgânico), no sulco de adubação, e o N-recuperado na planta nos estádios de 5-6 folhas, 11-12 folhas, florescimento e maturação fisiológica. O delineamento experimental foi inteiramente casualizado com parcelas subdivididas e três repetições. As parcelas foram constituídas das fontes U e SA, e as subparcelas, das épocas de aplicação de N. O experimento foi realizado em Latossolo Vermelho ácrico típico fase cerrado subcadocifólio, na Fazenda Floresta do Lobo-Pinusplan, em Uberlândia (MG). Na aplicação em pré-semeadura, a máxima imobilização foi observada aos 19 dias da aplicação do SA (13,3 kg ha-1 ou 16,6 % do N-aplicado) e aos 40 dias da aplicação da U (13,7 kg ha-1 ou 17,1 % do N-aplicado). A maior quantidade de N fertilizante assimilado pela planta ocorreu entre os estádios de 5-6 e 11-12 folhas (44,1 e 23,4 % do N-SA e N-U, respectivamente). Na aplicação em cobertura, a imobilização do N-SA foi inferior a 3,5 % do N-aplicado, enquanto a imobilização do N-U foi de 9,9 kg ha-1 e 7,9 kg ha-1, respectivamente, nos estádios de 11-12 folhas e florescimento. Até o estádio de maturação fisiológica da cultura, 61,8 % do N-SA e 42,0 % do N-U foram recuperados pelo milho. Em média, nos estádios de 11-12 folhas e de florescimento, para cada kg de N-SA imobilizado, as plantas de milho recuperaram 8,0 e 16,7 kg ha-1 de N fertilizante em pré-semeadura e cobertura, respectivamente. Nos tratamentos com U, a média foi de 3,1 kg ha-1, independentemente da época de aplicação. As produtividades de grãos obtidas com SA e U, independentemente da época de aplicação, foram de 7.824 kg ha-1 e 6.977 kg ha-1, respectivamente. Na adubação em pré-semeadura do milho, o SA apresentou maior rapidez na ciclagem do N imobilizado-mineralizado ("turnover"), em relação a U, e, conseqüentemente, causou maior assimilação do N pela cultura. Em cobertura, no sulco de adubação, somente houve imobilização do N-U, retardando a sua assimilação pela planta.In order to evaluate the amount of immobilized N and the amount of N-fertilizer recovered by corn plants at the stages:5-6 leaves, 11-12 leaves, flowering, and physiologic maturation, ammonium sulfate (AS) and urea (U), labeled with 15N, were applied to maize in a no-till system 43 days before planting and 31 days after planting at a single rate of 80 kg ha-1 of N incorporated at 5-7 cm depth and in a spacing of 0.8 m. Corn was sown after black oat (Avena strigosa Schieb.). The treatments were applied in split-plots set up in the completely randomized design with three replications. The original plots with two N sources were halved for the application time factor (pre-planting and top-dressing application). The field experiment was carried out on a Typic Acrustox on the farm Floresta do Lobo, Uberlandia, state of Minas Gerais. Results show that in pre-planting application treatments the maximum N-AS immobilization occurred 19 days after the fertilizer application (13.3 kg ha-1 or 16.6 % of N applied) whereas the maximum immobilization of N-U occurred 40 days after fertilizer application (13.7 kg ha-1 or 17.1 % of N applied). The highest amount of 15N-fertilizer taken up by corn plants was observed between the stages 5-6 leaves and 11-12 leaves, at ratios of 44.1 % of N-AS and 23.4 % of N-U. The immobilized N in the treatment with top-dressed AS was lower than 3.5 % of the applied N whereas in the treatment with top-dressed U it was 9.9 kg ha-1 and 7.9 kg ha-1 at the stages 11-12 leaves and flowering, respectively. The recovery of N-fertilizer measured at the stage of physiologic maturation in the treatments with AS and U was 61.8 % and 42.0 % respectively. The 15N-fertilizer amounts recovered by corn plants per kg of 15N immobilized in the treatments with AS were 8.0 kg ha-1 and 16.7 kg ha-1 respectively for pre-planting and top-dressing application. Independent of the application time, the ratio N-fertilizer recovery/immobilized N-fertilizer in the U treatments was 3.1 kg ha-1. The highest corn yields were obtained in the AS treatments (grain mean of 7,824 kg ha-1), independent of the application time. The average crop yield in the treatments with U in both application periods was 6,977 kg ha-1. These results show that when the fertilizers were applied at pre-planting the immobilization-mineralization turnover was faster in the AS than in the U treatment. Consequently, the N-assimilation by corn plants was higher in the AS treatments. For top-dressing application, only U was significantly immobilized.
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- 2005
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28. Influência da cultura antecessora e da adubação nitrogenada na produtividade de milho em sistema plantio direto e solo preparado Influence of the previous winter crop and nitrogen fertilization to corn productivity in notillage and conventional tillage
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Waldo Alejandro Rubén Lara Cabezas, Bruno José Rodrigues Alves, Segundo Sacramento Urquiaga Caballero, and Denise Garcia de Santana
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fertilização em pré-semeadura ,Zea mays ,plantas de cobertura do solo ,eficiência do fertilizante ,15N ,volatilização de amônia ,pre-plant applied N ,winter crops residues ,N efficiency ,15N tracer ,NH3-N volatilization ,Agriculture ,Agriculture (General) ,S1-972 - Abstract
Na região do Cerrado, parte da adubação de cobertura no milho poderia ser antecipada à semeadura do milho visando acelerar a decomposição de resíduos da cultura antecessora. Os objetivos deste experimento foram: a) avaliar a produtividade de milho em sucessão à nabo forrageiro e milheto, na presença e ausência de adubação nitrogenada de cobertura e b) avaliar a eficiência de recuperação de N-adubo na planta e quantificar a volatilização de N-NH3 do fertilizante nitrogenado aplicado em sistema plantio direto (SPD) e em solo preparado (SP). O delineamento experimental utilizado foi blocos casualizados, em esquema de faixas, com quatro repetições. Até o florescimento, a produção de massa de matéria seca (MMS) e acumulação de N na parte aérea do nabo forrageiro foi de, respectivamente, 2.274 e 53,0kg ha-1, sob SPD, e 2.546 e 61,6kg ha-1, sob SP. No caso do milheto, os resultados obtidos foram 5.202 e 107,8kg ha-1, em SPD, e 5.101 e 104,1kg ha-1 em SP. Até a semeadura do milho em SPD, após o acamamento das culturas de inverno, foram liberados 77,3 e 130,7kg ha-1 de N na sucessão nabo-milho e milheto-milho, respectivamente. Na condição de SP, as culturas de inverno foram incorporadas ao solo antes da semeadura do milho. Na cultura do milho, a perda por volatilização de N-NH3 foi inferior a 2,0% do N-aplicado em pré-semeadura (71,3kg ha-1 de N na proporção 4:1, uréia:sulfato de amônio) e 14 % do N aplicado (5kg ha-1) em cobertura (35,7kg ha-1 de N-sulfato de amônio), avaliadas em SPD e SP, na sucessão nabo-milho. Em SPD, a eficiência da fertilização foi 57,1 e 42,1% do N-aplicado na sucessão milheto-milho e nabo-milho, respectivamente. Em SP, 46,8 e 46,3%, respectivamente. A adubação nitrogenada promoveu um acréscimo médio de 2.396kg ha-1 de grãos na sucessão milheto-milho, em SPD, comparada à testemunha não adubada. Este acréscimo foi de 895kg ha-1 de grãos na sucessão nabo-milho, sob SPD, e de respectivamente, 1.166 e 166kg ha-1 de grãos nas sucessões milheto-milho e nabo-milho, em SP.In the Cerrado region a proportion of the top dressed N for corn might be applied to the previous cover crop. This could accelerate the decomposition rate and increase overall N availability to corn. Therefore, the objectives of this experiment were: a) to evaluate maize productivity after oil radish and millet grown in winter with and without nitrogen applied and b) to determine the efficiency of recovery of N fertilizer by corn and quantify the losses by volatilization of ammonia of N fertilizers in no-tillage (NT) and conventional tillage (CT). The experimental design was a randomized complete block in strips with four replications. At flowering, the dry matter production and N accumulation of the oil radish were, respectively, 2,274 and 53.0kg ha-1 under NT, and 2,546 and 61.6kg ha-1 under CT. For millet the results obtained were 5,202 and 107.8kg ha-1 under NT, and 5,101 and 104.1kg ha-1 under CT. Until the seeding of the maize under NT, after desiccation by knife rolling the winter crops, 77.3 and 130.7kg N ha-1 were released in the sequences of oil radish - maize and of millet - maize, respectively. Under CT the winter crops were incorporated into the soil before the seeding of the maize. In the growth cycle of corn the losses of N via ammonia volatilization were less than 2.0% of the N applied at pre-seeding (71.3kg N ha-1 in a mixture urea:ammonium sulphate of 4:1) and 14% of the N at the 6-leaf stage (35.7kg N ha-1 of ammonium sulphate), evaluated in NT and CT in the sequence oil radish - corn. Under NT the fertilizer-N-use-efficiency was 57.1 and 42.1% of the N applied in the sequence millet - corn and oil radish-maize, respectively. Under CT these values were 46.8 and 46.3%, respectively. The application of N fertilizer caused a mean yield increase of 2,396kg grain ha-1 in the sequence millet-corn under NT compared to the non-fertilized control. These increase under CT was 895kg grain ha-1 in the sequence oil radish-corn under NT, and 1,166 and 166kg grain ha-1 in the sequences millet-corn and oil radish-corn, respectively.
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- 2004
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29. Amaranto BRS Alegria: alternativa para diversificar os sistemas de produção
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Carlos Roberto Spehar, Danielly Leite Teixeira, Waldo Alejandro Rúben Lara Cabezas, and Eduardo Andrea Lemus Erasmo
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Agriculture (General) ,S1-972 - Abstract
A diversificação do sistema produtivo depende de espécies com rápido crescimento, tolerância ao déficit hídrico, produção de biomassa, ciclagem de nutrientes e utilização humana e animal. As espécies Amaranthus caudatus, A. cruentus e A. hypochondriacus apresentam essas características e sementes claras, sem dormência. Distinguem-se das invasoras A. spinosus, A. hybridus, A. blitum e A. viridis, com sementes escuras e dormentes. Os grãos, com excelente qualidade protéica, atendem à demanda por dietas especiais, livres de glúten e podem ser usados na alimentação animal. O A. cruentus BRS Alegria, primeira recomendação ao cultivo granífero no Brasil, originou-se da variedade AM 5189, dos Estados Unidos, na qual realizou-se seleção massal. Em sucessão à soja, apresentou produção média de 2.359 kg ha-1 de grãos e 5.650 kg ha-1 de biomassa total em apenas 90 dias de ciclo.
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- 2003
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30. EFICIÊNCIA AGRONÔMICA DE FOSFATOS NATURAIS REATIVOS NA CULTURA DO MILHO AGRONOMIC EFFICIENCY OF REACTIVE ROCK PHOSPHATES FOR CORN PRODUCTION IN BRAZIL
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Gaspar Henrique Korndörfer, Waldo Alejandro Lara-Cabezas, and Nelson Horowitz
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Arad ,Gafsa ,Marrocos ,fósforo ,resina ,Marroco ,phosphorus ,resin ,Agriculture (General) ,S1-972 - Abstract
O presente trabalho teve como objetivo avaliar o comportamento agronômico de fosfatos naturais estrangeiros quanto a produção de grãos de milho comparando com o superfosfato triplo. O ensaio foi conduzido em um latossolo vermelho amarelo de textura média no município de Uberlândia-MG. Os tratamentos empregados foram: fosfato Arad e Gafsa nas doses de P205 de 100 e 200 kg ha-1 e fosfato Marrocos e superfosfato triplo nas dosagens de 0, 50, 100, 200 e 400 kg ha-1. A capacidade dos fosfatos naturais Arad, Marrocos e Gafsa em fornecer fósforo para o milho foi de 60, 80 e 97%, respectivamente, quando comparados com o superfosfato triplo. Houve correlação positiva entre os teores de P nas folhas do milho e a produtividade. A avaliação do P disponível no solo foi mais bem representada pelo método da resina comparado com o método Mehlich-1.The objective of the study was to evaluate the agronomic efficiency of reactive rock phosphates for corn production, in compasion to triple superphosphate. The study was conducted on an Oxisol of medium texture. The rock phosphates were: Arad and Gafsa, applied at 100 and 200 kg P2O5 ha-1; and Marrocco rock phosphate and triple superphosphate, applied at 0, 50, 100, 200 and 400 kg P2O5 ha-1. Arad, Marrocco and Gafsa rock phosphate were calculated to be 60, 80 and 97%, respectively, as effective as triple superphosphate in supplying P to corn. There was positive correlation among the concentration of P in corn leaves and grain yield to estimate the availability of P to corn. The resin soil P test was more precise than Mehlich-1.
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- 1999
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31. MINERALIZAÇÃO E VOLATILIZAÇÃO DO NITROGÊNIO DA VINHAÇA-15N NA PRESENÇA OU NÃO DE URÉIA E DE PALHA DE CANA- DE-AÇÚCAR MINERALIZATION AND VOLATILIZATION OF NITROGEN FROM VINASSE-15N IN THE PRESENCE OR ABSENCE OF UREA AND SUGARCANE TRASH
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Vilma Maria Silva, Paulo Cesar Ocheuze Trivelin, Waldeciro Colaço, Fernando Antonio Franco da Encarnação, and Waldo Alejandro Ruben Lara Cabezas
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vinhaça-15N ,uréia ,mineralização de N ,volatilização de N ,vinasse-15N ,urea ,N mineralization ,N volatilization ,Agriculture (General) ,S1-972 - Abstract
O N mineral e o N volatilizado derivado da vinhaça marcada com 15N foram determinados em amostras de dois solos (Podzólico Vermelho-Amarelo, arenoso - PV, e Latossolo Roxo, argiloso - LR) do município de Piracicaba, SP, em experimento de laboratório. Os solos foram tratados com vinhaça marcada com 15N (V*) na dose de 100 mg.kg-1 de N-vinhaça. Os tratamentos constaram da aplicação de vinhaça isoladamente (V*), de vinhaça e uréia (V*+U), de vinhaça e palha de cana-de-açúcar (V*+P), e de vinhaça mais uréia e palha (V*+U+P), e foram incubados por 7, 14, 21, 28 e 35 dias. As parcelas foram constituídas por 50 g de solo. As doses de incorporação de N-uréia e palha de cana-de-açúcar foram de 220 mg.kg-1 e 22 g.kg-1, respectivamente. As concentrações de N-NH4+ e N-NO3- no solo proveniente da vinhaça foram influenciadas pelo tipo de solo. A adição aos solos da uréia e da vinhaça promoveu uma maior disponibilidade de N-NH4+ e de N-NO3- proveniente da vinhaça. A adição de palha e de vinhaça não alterou as concentrações de N-NH4+ e de N-NO3- provenientes da vinhaça nos solos. A adição da palha, da uréia e da vinhaça não alterou as concentrações de N-NH4+ e as concentrações de N-NO3- aumentaram apenas no solo LR ao longo do tempo. As perdas por volatilização de N da vinhaça foram, em geral, crescentes, para todos os tratamentos no solo PV e mais elevadas (14 %) que no solo LR (5%); neste, foram bem similares.The mineralized and volatilized nitrogen derived from vinasse labelled with 15N were determined in a laboratory experiment, using samples of two soils [a sandy Red-Yellow Podzolic - PV and a clayey Latosol - LR (Oxisol)], collected in Piracicaba, SP, Brazil. The experiment consisted of four treatments: application of vinasse (V*); vinasse with urea (V*+U); vinasse with sugarcane straw (V*+P); and vinasse with urea and sugarcane straw (V*+U+P). Vinasse, labelled with 15N (V*) was applied at a rate of 100 mg.kg-1 of N-vinasse. All treatments, were incubated for 7, 14, 21, 28, and 35 days. N-urea and sugarcane straw were incorporated in the soil at rates of 220 mg.kg-1 and 22 g.kg-1, respectively. NH4+-N and NO3--N concentrations, as a result of the vinasse addition, were affected by soil type. A larger availability of NH4+-N and NO3--N derived from vinasse were observed, when urea was added. Sugarcane straw plus vinasse did not alter the concentrations of NH4+-N and NO3--N derived from vinasse. Urea plus sugarcane straw did not affect NH4+-N concentrations, and affected the NO3--N concentration in LR soil over time. Losses of vinasse-N, due to volatilization, increased with time for all treatments, and were larger for PV (14%) than for LR (5%); but such losses were similar in LR soil.
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- 1999
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32. Atrial fibrillation-atrial flutter interactions: clinical implications for ablation.
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Waldo AL
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- 2007
33. Localization of focal atrial tachycardias -- back to the future...when (old) electrophysiologic first principles complement sophisticated technology.
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Kalman JM, Kistler PM, and Waldo AL
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- 2007
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34. A symposium: impact of MADIT on current cardiology practice... Multicenter Automatic Defibrillator Implantation Trial (MADIT)... a symposium held on November 10, 1996, as a satellite to the 1996 American Heart Association Meeting in New Orleans, Louisiana.
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Waldo AL and Weisfeldt ML
- Published
- 1997
35. Cardiovascular outcomes in the AFFIRM Trial (Atrial Fibrillation Follow-Up Investigation of Rhythm Management). An assessment of individual antiarrhythmic drug therapies compared with rate control with propensity score-matched analyses.
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Saksena S, Slee A, Waldo AL, Freemantle N, Reynolds M, Rosenberg Y, Rathod S, Grant S, Thomas E, Wyse DG, Saksena, Sanjeev, Slee, April, Waldo, Albert L, Freemantle, Nick, Reynolds, Mathew, Rosenberg, Yves, Rathod, Snehal, Grant, Shannon, Thomas, Elizabeth, and Wyse, D George
- Abstract
Objectives: The impact of individual antiarrhythmic drugs (AADs) on mortality and hospital stay in atrial fibrillation (AF) was evaluated.Background: Cardiovascular (CV) outcomes in AF patients receiving pharmacologic rhythm control therapy have not been compared with rate control therapy on the basis of AAD selection.Methods: We compared CV outcomes in the AFFIRM (Atrial Fibrillation Follow-Up Investigation of Rhythm Management) trial in subgroups defined by the initial AAD selected with propensity score matched subgroups from the rate arm (Rate).Results: Seven hundred twenty-nine amiodarone patients, 606 sotalol patients, and 268 Class 1C patients were matched. The composite outcome of mortality or cardiovascular hospital stays (CVH) showed better outcomes with Rate compared with amiodarone (hazard ratio [HR]: 1.18, 95% confidence interval [CI]: 1.03 to 1.36, p = 0.02), sotalol (HR: 1.32, 95% CI: 1.13 to 1.54, p < 0.001), and Class 1C (HR: 1.22, 95% CI: 0.97 to 1.56, p = 0.10). There was a nonsignificant increase in mortality with amiodarone (HR: 1.20, 95% CI: 0.94 to 1.53, p = 0.15) with the risk of non-CV death being significantly higher with amiodarone versus Rate (HR: 1.11, 95% CI: 1.01 to 1.24, p = 0.04). First CVH event rates at 3 years were 47% for amiodarone, 50% for sotalol, and 44% for Class 1C versus 40%, 40%, and 36%, respectively, for Rate (amiodarone HR: 1.20, 95% CI: 1.03 to 1.40, p = 0.02, sotalol HR: 1.364, 95% CI: 1.16 to 1.611, p < 0.001, Class 1C HR: 1.24, 95% CI: 0.96 to 1.60, p = 0.09). Time to CVH with intensive care unit stay or death was shorter with amiodarone (HR: 1.22, 95% CI: 1.02 to 1.46, p = 0.03).Conclusions: In AFFIRM, composite mortality and CVH outcomes differed for Rate and AADs due to differences in CVH; CVH event rates during follow-up were high for all cohorts, but they were higher for all groups on AADs. Death, intensive care unit hospital stay, and non-CV death were more frequent with amiodarone. [ABSTRACT FROM AUTHOR]- Published
- 2011
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36. Warfarin and aspirin use in atrial fibrillation among practicing cardiologist (from the AFFECTS Registry)
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Kowey PR, Reiffel JA, Myerburg R, Naccarelli GV, Packer DL, Pratt CM, Reiter MJ, Waldo AL, and AFFECTS Scientific Advisory Committee and Investigators
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- 2010
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37. Practice patterns among United States cardiologists for managing adults with atrial fibrillation (from the AFFECTS Registry)
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Reiffel JA, Kowey PR, Myerburg R, Naccarelli GV, Packer DL, Pratt CM, Reiter MJ, Waldo AL, and AFFECTS Scientific Advisory Committee and Investigators
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- 2010
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38. Improved survival with an implanted defibrillator in patients with coronary disease at high risk for ventricular arrhythmia.
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Moss AJ, Hall J, Cannom DS, Daubert JP, Higgins SL, Klein H, Levine JH, Saksena S, Waldo AL, Wilber D, Brown MW, and Heo M
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- 1996
39. Edoxaban versus warfarin in patients with atrial fibrillation
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Robert P. Giugliano, Christian T. Ruff, Eugene Braunwald, Sabina A. Murphy, Stephen D. Wiviott, Jonathan L. Halperin, Albert L. Waldo, Michael D. Ezekowitz, Jeffrey I. Weitz, Jind?ich ?pinar, Witold Ruzyllo, Mikhail Ruda, Yukihiro Koretsune, Joshua Betcher, Minggao Shi, Laura T. Grip, Shirali P. Patel, Indravadan Patel, James J. Hanyok, Michele Mercuri, Elliott M. Antman, Braunwald E, Antman EM, Giugliano RP, Ruff CT, Morin SE, Hoffman EB, Murphy SA, Deenadayalu N, Grip L, Mercuri M, Lanz H, Patel I, Curt V, Duggal A, Hanyok J, Davé J, Morgan D, Choi Y, Shi M, Jin J, Xie J, Crerand W, Kappelhof J, Maxwell W, Skinner M, Patel S, Betcher J, Selicato G, Otto C. Jr, Reissner C, Smith K, Ostroske J, Ron A, Giugliano R, Connolly S, Camm J, Ezekowitz M, Halperin J, Waldo A, Paolasso E, Aylward P, Heidbuchel H, Nicolau JC, Goudev A, Roy D, Weitz J, Corbalán R, Yang Y, Botero R, Bergovec M, Ŝpinar J, Grande P, Hassager C, Voitk J, Huikuri H, Nieminen M, Blanc JJ, LeHeuzey JY, Mitrovic V, Alexopoulos D, Sotomora G, Kiss R, SomaRaju B, Lewis B, Merlini P, Metra M, Koretsune Y, Yamashita T, García Castillo A, Ophuis T, White H, Atar D, Horna M, Babilonia N, Ruzyllo W, Morais J, Dorobantu M, Ruda M, Ostojic M, Duris T, Dalby A, Chung N, Zamorano JL, Juul Möller S, Moccetti T, Chen SA, Sritara P, Oto A, Parkhomenko A, Senior R, Verheugt F, Skene A, Anderson J, Bauer K, Easton JD, Goto S, Wiviott S, Lowe C, Awtry E, Berger CJ, Croce K, Desai A, Gelfand E, Goessling W, Greenberger NJ, Ho C, Leeman DE, Link MS, Norden AD, Pande A, Rost N, Ruberg F, Silverman S, Singhal A, Vita JA, Vogelmann O, Gonzalez C, Ahuad Guerrero R, Rodriguez M, Albisu J, Rosales E, 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McLaurin B, Lack A, Mega J, Marti J, Meholick A, Skinner J, Mehrle A, Wall J, Mendelson R, Cervellione K, Mercado A, Cajulis C, Michlin B, Romero Colon J, Milas J, Sanders D, Miller R, Sanchez S, Miller S, Gryczan J, Mody F, Strugatsky S, Moran J, Garner S, Morledge J, Bowman B, Mouhaffel A, Parrott N, Mounsey P, Schuler C, Mowdy M, Todd S, Mullen P, Raziano S, Murphy A, Oehmann V, Nadar V, Parker A, Naidu J, West M, Nallasivan M, Goza J, Nguyen T, Nomanee S, Nielsen R, Wilmot M, Oberoi M, Thakkar N, Oppenheimer K, McCormick J, Orchard R, Garcia L, Osborne J, Gonzalez M, Oza S, Joseph L, Patnam S, Dennison K, Pavon H, Gorry N, Pearlstein R, Montayne S, Pentz W, Duncan D, Peters P, Chacon L, Petruzziello F, Morlando F, Pettis K, Brown F, Pezzella S, Kirk D, Poulathas A, Cush S, Pratt R, Neeper L, Pribble A, Lowe K, Pudi K, Sham L, Pugeda J, Ebert J, Quadrel M, Rafla E, Quinlan E, Reed C, Quinn J, Hemmen C, Rama P, Domingo D, Redondo V, Wroblewski J, Renzi M, Stanley E, Richwine R, Pazier P, Riofrio K, Braun D, Robinson J, Cherrico M, Roehll W, Hollihan P, Rosado, Barnhorst M, Rosado J, Bamhorst M, Rosen R, Martin C, Ross S, Freeman R, Ruoff G, Nelson T, Sacco J, Ball E, Samal A, Schomburg J, Sandberg J, Lafave J, Savin V, Clifton R, Schaefer S, Fekete A, Schneider R, Schneider W, Schulman D, Mercer S, Seals A, Ullig T, Holt A, Seide H, Mather N, Shah G, Witt P, Shalaby A, Seese M, Shanes J, Fleets J, Shaoulian E, Hren A, Sheikh K, Hengerer T, Shih H, Browning J, Shoukfeh M, Stephenson L, Siler T, Champagne M, Simpson P, Meyer R, Singh N, Turner K, Singh V, Nelson M, Skierka R, Hughes B, Keene R, Smith R, Hodnett P, Spangenthal S, Thomason L, Sperling M, Vasquez E, Spivack E, McCartney P, Staniloae C, Liu M, Steljes A, Cox C, Struble R, Vittitow T, Suresh D, Frost J, Swerchowsky V, Freemyer D, Szulawski I, Herwehe S, Tahirkheli N, Springer K, Takata T, Bruton T, Talano J, Leo L, Tami L, Corchado D, Tatarko M, Swauger M, Tawney K, Dastoli K, Teague S, Young K, Tee H, Mitchell T, Teixeira J, Southam D, Torres M, Tucker P, Salas L, Updegrove J, Hanna K, Val Mejias J, Harrelson KG, Vemireddy D, Cardoza T, Verma S, Parsons T, Vicari R, Warren K, Vijay N, Washam M, Vossler M, Kilcup S, Walsh R, Renaud K, Ward S, Locklear T, Waxman F, Sanchez G, Weiss R, St Laurent B, Westcott J, Williams D, Gibson C, Williams R, Dowling C, Willis J, VonGerichten S, Wood K, Capasso Gulve E, Worley S, Pointer S, Yarows S, Sheehan T, Yasin M, Yi J, Dongas B, Yousuf K, Zakhary B, Curtis S, Zeig S, Mason T, Zellner C, Harden M, Roper E, Waseem M, Grammer M., PERRONE FILARDI, PASQUALE, Cardiovascular Division (SZG), Brigham and Women's Hospital [Boston], Mount Sinai Medical Center, Icahn School of Medicine at Mount Sinai [New York] (MSSM), University Hospitals Case Medical Center (CLEVELAND - UHCMC), University Hospitals Case Medical Center, Jefferson Medical College (JMC), Thomas Jefferson University Hospitals, Thrombosis and Atherosclerosis Research Institute (TARI), McMaster University [Hamilton, Ontario], University Hospital Brno, Institute of Cardiology (WARSAW - Cardiology), Institute of Cardiology, Cardiology Research Center (MOSCOU - CRC), Cardiology Research Center, National Hopital Organization (OSAKA - NHO), Osaka National Hospital, Université de Brest (UBO), Centre d'Investigation Clinique (CIC - Brest), Université de Brest (UBO)-Institut National de la Santé et de la Recherche Médicale (INSERM), Graduate School, Endocrinology, ACS - Amsterdam Cardiovascular Sciences, Cardiology, Nursing, AGEM - Amsterdam Gastroenterology Endocrinology Metabolism, General Internal Medicine, Giugliano, Rp, Ruff, Ct, Braunwald, E, Murphy, Sa, Wiviott, Sd, Halperin, Jl, Waldo, Al, Ezekowitz, Md, Weitz, Ji, Špinar, J, Ruzyllo, W, Ruda, M, Koretsune, Y, Betcher, J, Shi, M, Grip, Lt, Patel, Sp, Patel, I, Hanyok, Jj, Mercuri, M, Antman, Em, Comi, Giancarlo, ENGAGE AF TIMI 48, Investigators, Robert P., Giugliano, Christian T., Ruff, Eugene, Braunwald, Sabina A., 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Thomason, L, Sperling, M, Vasquez, E, Spivack, E, Mccartney, P, Staniloae, C, Liu, M, Steljes, A, Cox, C, Struble, R, Vittitow, T, Suresh, D, Frost, J, Swerchowsky, V, Freemyer, D, Szulawski, I, Herwehe, S, Tahirkheli, N, Springer, K, Takata, T, Bruton, T, Talano, J, Leo, L, Tami, L, Corchado, D, Tatarko, M, Swauger, M, Tawney, K, Dastoli, K, Teague, S, Young, K, Tee, H, Mitchell, T, Teixeira, J, Southam, D, Torres, M, Tucker, P, Salas, L, Updegrove, J, Hanna, K, Val Mejias, J, Harrelson, Kg, Vemireddy, D, Cardoza, T, Verma, S, Parsons, T, Vicari, R, Warren, K, Vijay, N, Washam, M, Vossler, M, Kilcup, S, Walsh, R, Renaud, K, Ward, S, Locklear, T, Waxman, F, Sanchez, G, Weiss, R, St Laurent, B, Westcott, J, Williams, D, Gibson, C, Williams, R, Dowling, C, Willis, J, Vongerichten, S, Wood, K, Capasso Gulve, E, Worley, S, Pointer, S, Yarows, S, Sheehan, T, Yasin, M, Yi, J, Dongas, B, Yousuf, K, Zakhary, B, Curtis, S, Zeig, S, Mason, T, Zellner, C, Harden, M, Roper, E, Waseem, M, and Grammer, M.
- Subjects
Male ,Pyridines ,[SDV]Life Sciences [q-bio] ,Embolism ,Kaplan-Meier Estimate ,030204 cardiovascular system & hematology ,chemistry.chemical_compound ,0302 clinical medicine ,Edoxaban ,Atrial Fibrillation ,MESH: Double-Blind Method ,030212 general & internal medicine ,MESH: Warfarin ,Stroke ,MESH: Aged ,MESH: Middle Aged ,Cardiovascular diseases [NCEBP 14] ,Hazard ratio ,General Medicine ,MESH: Follow-Up Studies ,Middle Aged ,3. Good health ,MESH: Atrial Fibrillation ,Cardiovascular Diseases ,Anesthesia ,Cardiology ,Female ,Adult ,Aged ,Anticoagulants ,Double-Blind Method ,Follow-Up Studies ,Hemorrhage ,Humans ,Thiazoles ,Warfarin ,MESH: Hemorrhage ,Andexanet alfa ,medicine.drug ,medicine.medical_specialty ,MESH: Enoxaparin ,MESH: Anticoagulants ,MESH: Stroke ,Dabigatran ,03 medical and health sciences ,Internal medicine ,medicine ,MESH: Kaplan-Meier Estimate ,Rivaroxaban ,MESH: Humans ,business.industry ,MESH: Cardiovascular Diseases ,MESH: Adult ,medicine.disease ,Confidence interval ,MESH: Male ,chemistry ,business ,MESH: Female ,MESH: Embolism - Abstract
Contains fulltext : 125374.pdf (Publisher’s version ) (Open Access) BACKGROUND: Edoxaban is a direct oral factor Xa inhibitor with proven antithrombotic effects. The long-term efficacy and safety of edoxaban as compared with warfarin in patients with atrial fibrillation is not known. METHODS: We conducted a randomized, double-blind, double-dummy trial comparing two once-daily regimens of edoxaban with warfarin in 21,105 patients with moderate-to-high-risk atrial fibrillation (median follow-up, 2.8 years). The primary efficacy end point was stroke or systemic embolism. Each edoxaban regimen was tested for noninferiority to warfarin during the treatment period. The principal safety end point was major bleeding. RESULTS: The annualized rate of the primary end point during treatment was 1.50% with warfarin (median time in the therapeutic range, 68.4%), as compared with 1.18% with high-dose edoxaban (hazard ratio, 0.79; 97.5% confidence interval [CI], 0.63 to 0.99; P
- Published
- 2013
40. An Evaluation of Phase Analysis to Interpret Atrial Activation Patterns during Persistent Atrial Fibrillation for Targeted Ablation.
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Lee S, Khrestian CM, Sahadevan J, and Waldo AL
- Abstract
Background: Phase analysis has been used to identify and localize atrial fibrillation (AF) sources for targeted ablation. We previously demonstrated that repetitive wannabe reentry (incomplete reentry) often generated an apparent stable rotor using phase analysis. The misinterpretation caused by phase analysis using atrial electrograms (AEGs) may result from detecting inaccurate time points at phase inversion (π to -π) in the instantaneous phase waveform converted from AEG. The purpose of this study was to evaluate the accuracy of phase analysis to detect atrial activations recorded from the high-density mapping of AF in patients with persistent and long-standing persistent (LSP) AF., Methods and Results: During open heart surgery, we recorded activation from both atria simultaneously using 512 electrodes in 7 patients with persistent and LSP AF. The phase analysis was compared to manual measurements during 4 s of data. For the accuracy of activation sequence maps, a successful recording site was defined as having ≤4 mismatched activation times during the 4 s. In all AF episodes, the accuracy of the phase analysis was only 82% of the total number of activation times due to either activation time differences (14.7%), under-sensing (2.7%), or over-sensing (0.6%). Only 67.9% of the total recording sites met the requirement of a successful recording site by phase analysis. In unsuccessful recording sites, AEG characteristics were relatively irregular cycle length (CL), complex AEG, and double potential AEG., Conclusion: The phase analysis was less accurate in recording sites with a relatively irregular CL, complex AEG, or double potential AEG. As a result, phase analysis may lead to the misinterpretation of atrial activation patterns during AF. A visual review of the original AEG is needed to confirm the detected AF sources of phase analysis before performing targeted ablation.
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- 2022
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41. Three-year outcomes of the postapproval study of the AtriCure Bipolar Radiofrequency Ablation of Permanent Atrial Fibrillation Trial.
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McCarthy PM, Gerdisch M, Philpott J, Barnhart GR, Waldo AL, Shemin R, Andrei AC, Gaynor S, Ndikintum N, and Calkins H
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- Aged, Anti-Arrhythmia Agents therapeutic use, Humans, Maze Procedure, Prospective Studies, Treatment Outcome, Atrial Fibrillation, Catheter Ablation adverse effects, Catheter Ablation methods
- Abstract
Objectives: The Cox Maze IV operation is commonly performed concomitant with other cardiac operations and effectively reduces the burden of atrial fibrillation. Prospective randomized trials have reported outcomes early and at 12 months, but only single-center late durability results are available. As part of the postapproval process for a bipolar radiofrequency ablation system, we sought to determine early and midterm outcomes of patients undergoing the Cox Maze IV operation., Methods: A prospective, multicenter, single-arm study of 363 patients (mean age, 70 years, 82% valve surgery) with nonparoxysmal atrial fibrillation (mean duration, 60 months, 94% Congestive heart failure, Hypertension, Age ≥ 75, Diabetes, Stroke, VAScular disease, Age 65-74, Sex category ≥2) undergoing concomitant Maze IV atrial fibrillation ablation at 40 sites with 70 surgeons was performed between June 2010 and October 2014. Compliance with the study lesion set was 94.5%, and 99% had left atrial appendage closure. Freedom from atrial fibrillation was determined by extended monitoring, with a 48-hour Holter monitor minimum., Results: There were no device-related complications. Freedom from atrial fibrillation off antiarrhythmic medications at 1, 2, and 3 years was 66%, 65%, and 64%, respectively, and including those using antiarrhythmics was 80%, 78%, and 76%, respectively. Warfarin was used in 49%, 44%, and 40%, respectively., Conclusions: In patients with nonparoxysmal atrial fibrillation, compliance with the protocol was high, and freedom from atrial fibrillation off antiarrhythmics was high and sustained to 3 years. The safety and effectiveness of the system and Cox Maze IV procedure support the Class I guideline recommendation for concomitant atrial fibrillation ablation in patients undergoing cardiac surgery., (Copyright © 2020 The American Association for Thoracic Surgery. Published by Elsevier Inc. All rights reserved.)
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- 2022
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42. Anticoagulation in new-onset postoperative atrial fibrillation: An analysis from the Society of Thoracic Surgeons Adult Cardiac Surgery Database.
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Riad FS, Grau-Sepulveda M, Jawitz OK, Vekstein AM, Sundaram V, Sahadevan J, Habib RH, Jacobs JP, O'Brien S, Thourani VH, Vemulapalli S, Xian Y, Waldo AL, and Sabik J
- Abstract
Background: New-onset postoperative atrial fibrillation (POAF) is the most common complication after cardiac surgery and is associated with increased long-term stroke and mortality. Anticoagulation has been suggested as a potential therapy, but data on safety and efficacy are scant., Objectives: To determine the association between anticoagulation for POAF and long-term outcomes., Methods: Adult patients with POAF after isolated coronary artery bypass surgery (CABG) were identified through the Society of Thoracic Surgeons Adult Cardiac Surgery Database and linked to the Medicare Database. Propensity-matched analyses were performed for all-cause mortality, stroke, myocardial infarction, and major bleeding for patients discharged with or without anticoagulation. Interaction between anticoagulation and CHA
2 DS2 -VASc score was also assessed., Results: Of 38,936 patients, 9861 (25%) were discharged on oral anticoagulation. After propensity score matching, discharge anticoagulation was associated with increased mortality (hazard ratio [HR] 1.16, 95% confidence interval [CI] 1.06-1.26). There was no difference in ischemic stroke between groups (HR 0.97, 95% CI 0.82-1.15), but there was significantly higher bleeding (HR 1.60, 95% CI 1.38-1.85) among those discharged on anticoagulation. Myocardial infarction was lower in the first 30 days for those discharged on anticoagulation, but this effect decreased over time. The incidence of all complications was higher for patients with CHA2 DS2 -VASc scores ≥5 compared to patients with scores of 2-4. Anticoagulation did not appear to benefit either subgroup., Conclusion: Anticoagulation is associated with increased mortality after new-onset POAF following CABG. There was no reduction in ischemic stroke among those discharged on anticoagulation regardless of CHA2 DS2 -VASc score., (© 2022 Heart Rhythm Society. Published by Elsevier Inc.)- Published
- 2022
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43. Reliable pace termination of postoperative atrial fibrillation in the canine sterile pericarditis model: Implications for atypical atrial flutter.
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Lee S, Vitebskiy S, Goldstein RN, Khrestian CM, and Waldo AL
- Abstract
Background: We have identified a reentrant circuit in the pulmonary vein region, which drives the atria, producing fibrillatory conduction, as one mechanism of postoperative atrial fibrillation (POAF) in the canine sterile pericarditis model., Objective: In this model, we tested the hypothesis that overdrive pacing from a site at or near such a reentrant circuit would interrupt it and thereby terminate POAF., Methods: We studied 11 sterile pericarditis dogs on postoperative days 1-4. Atrial electrograms (AEGs) were recorded during POAF, overdrive pacing, and pace termination from 3 sites simultaneously: Bachmann's bundle, posterior left atrium, and right atrial appendage. When recorded AEGs demonstrated regular activation, pace termination was attempted at that site by delivering a drive train starting with 4 consecutive beats at a cycle length (CL) of 2-5 ms shorter than that of the intrinsic CL., Results: Sixteen episodes of sustained POAF (>5 minutes) diagnosed by electrocardiogram were induced. During all episodes of POAF, AEGs recorded from the left atrium exhibited regular activation, ie, constant AEG morphology and CL. When capture of the reentrant circuit by overdrive pacing occurred (mean 13 ± 5, range 5-23 beats), all 16 POAF episodes were successfully terminated. In all termination episodes, at the end of pacing but prior to the return of sinus rhythm, there was disorganized atrial activation in the previously organized sites (mean 2 seconds, range 0.1-8 seconds). However, these beats did not sustain POAF in the absence of a reentrant circuit ("driver")., Conclusion: Overdrive pacing from a site demonstrating regular activation during sustained POAF terminated the POAF by interrupting the reentrant circuit., (© 2022 Heart Rhythm Society. Published by Elsevier Inc.)
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- 2022
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44. Women and atrial fibrillation.
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Volgman AS, Benjamin EJ, Curtis AB, Fang MC, Lindley KJ, Naccarelli GV, Pepine CJ, Quesada O, Vaseghi M, Waldo AL, Wenger NK, and Russo AM
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- Anti-Arrhythmia Agents therapeutic use, Electric Countershock, Female, Humans, Male, Quality of Life, Atrial Fibrillation diagnosis, Atrial Fibrillation epidemiology, Atrial Fibrillation therapy, Catheter Ablation, Stroke diagnosis, Stroke epidemiology, Stroke etiology
- Abstract
Atrial fibrillation (AF) remains a growing problem in the United States and worldwide, imposing a high individual and health system burden, including increased resource consumption due to repeated hospitalizations, stroke, dementia, heart failure, and death. This comprehensive review summarizes the most recent data on sex-related differences in risks associated with AF. Women with AF have increased risk of stroke and death compared to men, and possible reasons for this disparity are explored. Women also continue to have worse symptoms and quality of life, and poorer outcomes with stroke prevention, as well as with rate and rhythm control management strategies. Many current rhythm control treatment strategies for AF, including cardioversion and ablation, are used less frequently in women as compared to men, whereas women are more likely to be treated with rate control strategies or antiarrhythmic drugs. Sex differences should be considered in treating women with AF to improve outcomes and women and men should be offered the same interventions for AF. We need to improve the evidence base to understand if variation in utilization of rate and rhythm control management between men and women represents health inequities or appropriate clinical judgement., (© 2020 Wiley Periodicals LLC.)
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- 2021
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45. New Insights Into Understanding Rotor Versus Focal Activation in Patients With Persistent Atrial Fibrillation.
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Lee S, Khrestian CM, Sahadevan J, Markowitz A, and Waldo AL
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- Electrodes, Heart Atria, Heart Block, Humans, Recurrence, Atrial Fibrillation
- Abstract
Objectives: This study was to test the hypotheses that: 1) when using phase analysis, repetitive Wannabe re-entry produces a phase singularity point (i.e., a rotor); and 2) the location of the stable rotor is close to the focal source., Background: Recent contact mapping studies in patients with persistent atrial fibrillation (AF) demonstrated that phase analysis produced a different mechanistic result than classical activation sequence analysis. Our studies in patients with persistent AF showed that focal sources sometimes produced repetitive Wannabe re-entry, that is, incomplete re-entry., Methods: During open heart surgery, we recorded activation from both atria simultaneously using 510 to 512 electrodes in 12 patients with persistent AF. We performed activation sequence mapping and phase analyses on 4 s of mapped data. For each detected stable rotor (>2 full rotations [720°] recurring at the same site), the corresponding activation patterns were examined from the activation sequence maps., Results: During AF, phase singularity points (rotors) were identified in both atria in all patients. However, stable phase singularity points were only present in 6 of 12 patients. The range of stable phase singularity points per patient was 0 to 6 (total 14). Stable phase singularity points were produced due to repetitive Wannabe re-entry generated from a focal source or by passive activation. A conduction block sometimes created a stable phase singularity point (n = 2). The average distance between a focal source and a stable rotor was 0.9 ± 0.3 cm., Conclusions: Repetitive Wannabe re-entry generated stable rotors adjacent to a focal source. No true re-entry occurred., Competing Interests: Funding Support and Author Disclosures This work was supported in part by grants from R01 HL146463 from the National Institutes of Health, National Heart, Lung, and Blood Institute; and by the Elisabeth Severance Prentiss Foundation. The authors have reported that they have no relationships relevant to the contents of this paper to disclose., (Copyright © 2021 American College of Cardiology Foundation. Published by Elsevier Inc. All rights reserved.)
- Published
- 2021
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46. Paradigm shifts in electrophysiological mechanisms of atrial fibrillation.
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Schotten U, Lee S, Zeemering S, and Waldo AL
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- Cardiac Electrophysiology, Electrophysiological Phenomena, Humans, Atrial Fibrillation diagnosis
- Abstract
Determining the sequence of activation is a major source of information for understanding the electrophysiological mechanism(s) of atrial fibrillation (AF). However, the complex morphology of the electrograms hampers their analysis, and has stimulated generations of electrophysiologists to develop a large variety of technologies for recording, pre-processing, and analysis of fibrillation electrograms. This variability of approaches is mirrored by a large variability in the interpretation of fibrillation electrograms and, thereby, opinions regarding the basic electrophysiological mechanism(s) of AF vary widely. Multiple wavelets, different types of re-entry including rotors, double layers, multiple focal activation patterns all have been advocated, and a comprehensive and commonly accepted paradigm for the fundamental mechanisms of AF is still lacking. Here, we summarize the Maastricht perspective and Cleveland perspective regarding AF mechanism(s). We also describe some of the key observations in mapping of AF reported over the past decades, and how they changed over the years, often as results of new techniques introduced in the experimental field of AF research., (Published on behalf of the European Society of Cardiology. All rights reserved. © The Author(s) 2020. For permissions, please email: journals.permissions@oup.com.)
- Published
- 2021
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47. Is competitive atrial pacing a possible trigger for atrial fibrillation? Observations from the RATE registry.
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Orlov MV, Olshansky B, Benditt DG, Kotler G, McIntyre T, Fujian Qu, Turkel M, Gorev M, Poghosyan H, and Waldo AL
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- Atrial Fibrillation epidemiology, Atrial Fibrillation physiopathology, Follow-Up Studies, Humans, Incidence, Prospective Studies, United States epidemiology, Atrial Fibrillation therapy, Cardiac Pacing, Artificial methods, Electrophysiologic Techniques, Cardiac methods, Heart Rate physiology, Registries
- Abstract
Background: A high incidence of asymptomatic atrial tachycardia and atrial fibrillation (AT/AF) has been recognized in patients with cardiac implantable devices (CIED). The clinical significance of these AT/AF episodes remains unclear. Some "device-detected AT/AF" was previously shown to be triggered by competitive atrial pacing (CAP)., Objective: To investigate and characterize a potential association between CAP and AT/AF in the largest series of observations to date., Methods: RATE, a multicenter registry, included 5379 patients with CIEDs followed for approximately 2 years. Electrograms (EGMs) from 1352 patients with AT/AF, CAP, or both were analyzed by experienced adjudicators to assess a causal relationship between AT/AF and CAP onset, duration, and morphology., Results: In 225 patients, 1394 episodes of both AT/AF and CAP were present in the same tracing. CAP and AT/AF were strongly associated (P ≤ .02). AT/AF occurred during the course of the study in 71% of patients with CAP. In 62% of the episodes, expert adjudication concluded that CAP triggered AT/AF. The duration and morphology of triggered and spontaneous AT/AF episodes differed. Spontaneous AT/AF episodes were associated with constant EGM morphology, and were either long or extremely short. CAP-triggered AT/AF more often had variable and shorter cycle length EGMs. The incidence of short AT/AF events was higher among triggered episodes (25% vs 12.8%, P < .002)., Conclusion: Device-triggered AT/AF due to CAP is likely more common than previously recognized. This AT/AF entity differs from spontaneous AT/AF in duration and morphology. Clinical implications of spontaneous and device-triggered AT/AF may be different., (Copyright © 2020 Heart Rhythm Society. Published by Elsevier Inc. All rights reserved.)
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- 2021
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48. Contemporary Anticoagulation Practices for Postoperative Atrial Fibrillation: A Single Center Experience.
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Riad FS, German K, Deitz S, Sahadevan J, Sundaram V, and Waldo AL
- Abstract
Aims: Postoperative atrial fibrillation (POAF) is a frequent in-hospital complication after cardiac surgery. Surprisingly, despite its prevalence, management of this condition has not been well studied. One promising approach that has been evaluated in a limited number of studies is use of anticoagulation. However, the trends and patterns of real-world use of anticoagulation in POAF patients has not been systemically investigated. In this study, we aimed to determine real-world patterns of anticoagulation use for patients with POAF., Methods: We identified 200 patients undergoing coronary artery bypass (CABG) or cardiac valve surgery at University Hospitals Cleveland Medical Center over a 2 year period beginning January 2016 with new onset POAF. We reviewed charts to verify candidacy for inclusion in the study and to extract data on anticoagulation use, adverse outcomes, and CHA
2 DS2 -VASc scores., Results: Anticoagulation use was low after CABG, but high after bioprosthetic valve surgery. The most common anticoagulant used was warfarin. Anticoagulation use was not correlated with CHA2 DS2 -VASc score or cardioversion. Stroke and mortality were higher among patients not receiving anticoagulation, however, confirmation of this finding in larger randomized studies is warranted., Conclusions: Anticoagulation use is low after CABG and this practice does not appear to be affected by CHA2 DS2 VASc score or cardioversion. This differs with previously reported provider attitudes towards management of this condition. Stroke and mortality appear to be elevated for patients not receiving anticoagulation but further investigation is required to confirm this observation.- Published
- 2020
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49. Reply to the Editor-Reconsidering the reconsideration of the multiple wavelet hypothesis.
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Lee S and Waldo AL
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- Humans, Atrial Fibrillation
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- 2020
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50. Attitudes toward anticoagulation for postoperative atrial fibrillation: A nationwide survey of VA providers.
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Riad FS, German K, Deitz S, Sahadevan J, Sundaram V, and Waldo AL
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- Female, Hospitals, Veterans, Humans, Male, Surveys and Questionnaires, Atrial Fibrillation etiology, Atrial Fibrillation therapy, Attitude of Health Personnel, Postoperative Complications etiology, Postoperative Complications therapy
- Abstract
Introduction: Postoperative atrial fibrillation (POAF) is a common complication after cardiac surgery. Though often felt to be self-limited, this complication has been associated with increases in both short and long-term stroke and mortality. Several studies have also shown a high rate of AF recurrence. Optimal treatment strategy is not yet defined, and the role of anticoagulation (AC) is unclear. Our objective was to determine provider attitudes toward management of this common complication., Methods: A survey consisting of 15 multiple choice questions was distributed to providers at Veterans Healthcare Administration hospitals nationwide., Results: The majority of respondents were cardiologists. Practices varied drastically with respect to AC use for patients with POAF who were discharged in normal sinus rhythm. Less variability existed for patients discharged in AF. There was no clear consensus regarding other factors to consider when deciding on AC therapy, including length of episode, or risk factors for stroke such as CHA
2 DS2 -VASc score. There was also no consensus on duration of therapy or need for post discharge cardiac monitoring., Conclusion: Our data indicate a wide variability in the management of POAF. This reflects conflicting recommendations in the guidelines, as well as a paucity of prospective treatment trials in this field. Nevertheless, a growing evidence base suggests that this complication carries potentially serious long-term morbidity and mortality, and better evidence for its management is needed., (© 2020 Wiley Periodicals LLC.)- Published
- 2020
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