536 results on '"J. Wiggins"'
Search Results
102. Factors Affecting Establishment and Recovery of Sasajiscymnus tsugae (Coleoptera: Coccinellidae), an Introduced Predator of Hemlock Woolly Adelgid (Hemiptera: Adelgidae) on Eastern Hemlock (Pinales: Pinaceae)
- Author
-
James R. Rhea, J. P. Parkman, Glenn Taylor, Jerome F. Grant, Abdul Hakeem, Paris L. Lambdin, David S. Buckley, Gregory J. Wiggins, and Frank A. Hale
- Subjects
Abiotic component ,Biotic component ,Ecology ,biology ,Tsuga ,National park ,biology.organism_classification ,Coleoptera ,Hemiptera ,Pinaceae ,Insect Science ,Animals ,Adelgidae ,Coccinellidae ,Hemlock woolly adelgid ,Pest Control, Biological ,Predator ,Ecology, Evolution, Behavior and Systematics - Abstract
To reduce populations of hemlock woolly adelgid, Adelges tsugae Annand (Hemiptera: Adelgidae),500,000 Sasajiscymnus tsugae (Sasaji and McClure) (Coleoptera: Coccinellidae) have been released in the Great Smoky Mountains National Park since 2002. To determine factors affecting establishment and recovery of these predatory beetles, 65 single release sites were sampled using beat sheets from 2008 to 2012. Several abiotic and biotic factors were evaluated for their association with establishment and recovery of S. tsugae. Information on predatory beetle releases (location, year of release, number released, and season of release), topographic features (elevation, slope, Beers transformed aspect, and topographic relative moisture index), and temperature data (minimum and maximum temperatures 1 d after release and average minimum and maximum temperatures 7 d after release) were obtained from Great Smoky Mountains National Park personnel. These factors were evaluated using stepwise logistic regression and Pearson correlation. S. tsugae was recovered from 13 sites 2 to 10 yr after release, and the greatest number was recovered from 2002 release sites. Regression indicated establishment and recovery was negatively associated with year of release and positively associated with the average maximum temperature 7 d after release and elevation (generally, recovery increased as temperatures increased). Several significant correlations were found between presence and number of S. tsugae and year of release, season of release, and temperature variables. These results indicate that releases of S. tsugae should be made in warmer (≍10-25°C) temperatures and monitored for at least 5 yr after releases to enhance establishment and recovery efforts.
- Published
- 2013
- Full Text
- View/download PDF
103. Review of 'A Structured Compensation Plan Improves But Does Not Erase the Sex Pay Gap in Surgery' by Morris M, Chen H, Heslin MJ, Krontiras H in Ann Surg 268
- Author
-
Larry H. Hollier and Claire J. Wiggins
- Subjects
Otorhinolaryngology ,business.industry ,Medicine ,Surgery ,Operations management ,General Medicine ,Plan (drawing) ,business ,Compensation (engineering) - Published
- 2018
- Full Text
- View/download PDF
104. Study design of ASPirin in Reducing Events in the Elderly (ASPREE): A randomized, controlled trial
- Author
-
E. Volpi, S. Katzman, A. A. Anwarrulah, B. Lewis, C. Womack, P. Wilson, Erica M. Wood, E. Hadley, J. Keller, M. Kidd, K. Dodd, Sharyn M. Fitzgerald, B. Ference, W. B. Applegate, Shawna D. Nesbitt, Walter P. Abhayaratna, S. V. Romashkan, M. Lang, V. A. Atlanta, Gerard Gill, J. Powell, T. Obisesan, Latha Palaniappan, M. Malik, A. Le, R. Swerdlow, C. Eaton, David Ames, J. Burns, H. Anderson, Elsdon Storey, Jessica E. Lockery, C. I. Johnston, Mark Nelson, J. Hannah, R. Head, Geoffrey A. Donnan, P. Bolin, T. Johnson, Andrew Tonkin, A. Newman, Christopher M. Reid, R. C. Shah, G. Pressman, A. Thomas, S. Satterfield, J. Weissfeld, Kevin A. Peterson, B. Radziszewska, J. Williamson, D. Gilbertson, John J McNeil, J. Flack, Jamehl S. Demons, K. Margolis, Nigel Stocks, Priscilla Pemu, J. Allard, James M. Shikany, Barbara Workman, L. Beilin, M. Singh, S. Anton, V. Figueredo, Peter Gibbs, P. Lichtenberg, Marco Pahor, M. Ernst, M. Ahmad, C. Jackson, Rory Wolfe, Sara E. Espinoza, M. Mikhail, F. MacRae, H. Krum, L. Cobiac, Lee A Birnbaum, J. Wiggins, V. Myers, W. Applegate, Nathan E. Britt, S. Krstevska, A. B. Newman, M. Oberoi, G. Russell, A. Gupta, D. Kruger, Robyn L. Woods, T. Church, R. E. Trevaks, B. Kirpach, Anne M Murray, R. Shah, Ron Monce, H. Tindle, M. Jelnik, L. M. Rodriguez, J. Aloia, B. Ott, L. Nyquist, R. Grimm, K. C. Johnson, C. Lawson, R. Allman, and P. Jose
- Subjects
Male ,medicine.medical_specialty ,Activities of daily living ,Physical disability ,Risk Assessment ,Article ,law.invention ,Double-Blind Method ,Randomized controlled trial ,law ,Neoplasms ,Internal medicine ,Activities of Daily Living ,medicine ,Clinical endpoint ,Humans ,Dementia ,Cognitive Dysfunction ,Disabled Persons ,Pharmacology (medical) ,Mortality ,Depression (differential diagnoses) ,Aged ,Aspirin ,Depression ,business.industry ,Anti-Inflammatory Agents, Non-Steroidal ,Australia ,General Medicine ,medicine.disease ,United States ,Clinical trial ,Cardiovascular Diseases ,Physical therapy ,Female ,Tablets, Enteric-Coated ,Gastrointestinal Hemorrhage ,business ,medicine.drug - Abstract
Cost-effective strategies to maintain healthy active lifestyle in aging populations are required to address the global burden of age-related diseases. ASPREE will examine whether the potential primary prevention benefits of low dose aspirin outweigh the risks in older healthy individuals. Our primary hypothesis is that daily oral 100. mg enteric-coated aspirin will extend a composite primary endpoint termed 'disability-free life' including onset of dementia, total mortality, or persistent disability in at least one of the Katz Activities of Daily Living in 19,000 healthy participants aged 65. years and above ('US minorities') and 70. years and above (non-'US minorities'). ASPREE is a double-blind, randomized, placebo-controlled trial of oral 100. mg enteric-coated acetyl salicylic acid (ASA) or matching placebo being conducted in Australian and US community settings on individuals free of dementia, disability and cardiovascular disease (CVD) events. Secondary endpoints are all-cause and cause specific mortality, fatal and non-fatal cardiovascular events, fatal and non-fatal cancer (excluding non-melanoma skin cancer), dementia, mild cognitive impairment, depression, physical disability, and clinically significant bleeding. To 20 September 2013 14,383 participants have been recruited. Recruitment and study completion are anticipated in July 2014 and December 2018 respectively. In contrast to other aspirin trials that have largely focused on cardiovascular endpoints, ASPREE has a unique composite primary endpoint to better capture the overall risk and benefit of aspirin to extend healthy independent lifespan in older adults in the US and Australia.
- Published
- 2013
- Full Text
- View/download PDF
105. KHA-CARI Guideline: Early chronic kidney disease: Detection, prevention and management
- Author
-
Richard Ks Phoon, David W. Johnson, Maria F. Chan, Nigel D Toussaint, Tim Usherwood, Graeme L Turner, Emelia Atai, Kathryn J. Wiggins, and Clodagh Scott
- Subjects
medicine.medical_specialty ,Screening test ,business.industry ,Life style ,MEDLINE ,Early detection ,General Medicine ,Guideline ,urologic and male genital diseases ,medicine.disease ,female genital diseases and pregnancy complications ,Screening programme ,Nephrology ,Primary health ,medicine ,Intensive care medicine ,business ,Kidney disease - Abstract
Early detection of CKD may therefore have value,although criteria for a screening programme to detect thedisease must be met to balance the aggregate benefits withthe risks and costs of the screening tests. General practition-ers, in particular, play a crucial role in CKD early detectionand management. All people attending their general practi-tioner should be assessed for CKD risk factors as part ofroutine primary health encounters.A number of studies
- Published
- 2013
- Full Text
- View/download PDF
106. Impact of icodextrin on clinical outcomes in peritoneal dialysis: a systematic review of randomized controlled trials
- Author
-
Sunil V. Badve, David W. Johnson, Yeoungjee Cho, Giovanni F.K. Strippoli, Kathryn J. Wiggins, and Jonathan C. Craig
- Subjects
medicine.medical_specialty ,medicine.medical_treatment ,Peritonitis ,Renal function ,Icodextrin ,Peritoneal dialysis ,law.invention ,Randomized controlled trial ,law ,Dialysis Solutions ,Internal medicine ,medicine ,Humans ,Adverse effect ,Glucans ,Randomized Controlled Trials as Topic ,Transplantation ,business.industry ,Prognosis ,medicine.disease ,Confidence interval ,Surgery ,Survival Rate ,Review Literature as Topic ,Glucose ,Nephrology ,Relative risk ,Kidney Failure, Chronic ,business ,Peritoneal Dialysis - Abstract
Background. Although icodextrin has been shown to augment peritoneal ultrafiltration in peritoneal dialysis (PD) patients, its impact upon other clinical end points, such as technique survival, remains uncertain. This systematic review evaluated the effect of icodextrin use on patient level clinical outcomes. Methods. The Cochrane CENTRAL Registry, MEDLINE, Embase and reference lists were searched (last search 13 September 2012) for randomized controlled trials of icodextrin versus glucose in the long dwell exchange. Summary estimates of effect were obtained using a random effects model. Results. Eleven eligible trials (1222 patients) were identified. There was a significant reduction in episodes of uncontrolled fluid overload [two trials; 100 patients; relative risk (RR) 0.30, 95% confidence interval (CI) 0.15-0.59] and improvement in peritoneal ultrafiltration [four trials; 102 patients; mean difference (MD) 448.54 mL/day, 95% CI 289.28-607.80] without compromising residual renal function [four trials; 114 patients; standardized MD (SMD) 0.12, 95% CI -0.26 to 0.49] or urine output (three trials; 69 patients; MD -88.88, 95% CI -356.88 to 179.12) with icodextrin use for up to 2 years. There was no significant effect on peritonitis incidence (five trials; 607 patients; RR 0.97, 95% CI 0.76-1.23), peritoneal creatinine clearance (three trials; 237 patients; SMD 0.36, 95% CI -0.24 to 0.96), technique failure (three trials; 290 patients; RR 0.58, 95% CI 0.28-1.20), patient survival (six trials; 816 patients; RR 0.82, 95% CI 0.32-2.13) or adverse events. Conclusions. Icodextrin prescription improved peritoneal ultrafiltration, mitigated uncontrolled fluid overload and was not associated with increased risk of adverse events. No effects of icodextrin on technique or patient survival were observed, although trial sample sizes and follow-up durations were limited.
- Published
- 2013
- Full Text
- View/download PDF
107. Weight loss and ethnicity: A cohort study of the effects induced by a very low calorie diet
- Author
-
C. Rolland, C. Hallam, S. Lula, J. Wiggins, Lee Dyson, L. F. Van Gaal, and I. Broom
- Subjects
General Medicine - Published
- 2013
- Full Text
- View/download PDF
108. Daily Variation in Death in Patients Treated by Long-term Dialysis: Comparison of In-Center Hemodialysis to Peritoneal and Home Hemodialysis
- Author
-
David W. Johnson, Sunil V. Badve, Kym M. Bannister, Philip A. Clayton, Neil Boudville, Carmel M. Hawley, Kevan R. Polkinghorne, Fiona G. Brown, Rathika Krishnasamy, Stephen P. McDonald, and Kathryn J. Wiggins
- Subjects
Male ,medicine.medical_specialty ,medicine.medical_treatment ,Myocardial Infarction ,Hemodialysis, Home ,Peritoneal dialysis ,Sudden cardiac death ,Cohort Studies ,Renal Dialysis ,Internal medicine ,Prevalence ,medicine ,Humans ,Registries ,Myocardial infarction ,Intensive care medicine ,Dialysis ,Aged ,Retrospective Studies ,Aged, 80 and over ,business.industry ,Home hemodialysis ,Australia ,Retrospective cohort study ,Middle Aged ,medicine.disease ,Death, Sudden, Cardiac ,Hemodialysis Units, Hospital ,Nephrology ,Hyperkalemia ,Kidney Failure, Chronic ,Female ,Hemodialysis ,business ,Peritoneal Dialysis ,New Zealand ,Cohort study - Abstract
There has been little study to date of daily variation in cardiac death in dialysis patients and whether such variation differs according to dialysis modality and session frequency.Observational cohort study using ANZDATA (Australia and New Zealand Dialysis and Transplant) Registry data.All adult patients with end-stage kidney failure treated by dialysis in Australia and New Zealand who died between 1999 and 2008.Timing of death (day of week), dialysis modality, hemodialysis (HD) session frequency, and demographic, clinical, and facility variables.Cardiac and noncardiac mortality.14,636 adult dialysis patients died during the study period (HD, n = 10,338; peritoneal dialysis [PD], n = 4,298). Cardiac death accounted for 40% of deaths and was significantly more likely to occur on Mondays in in-center HD patients receiving 3 or fewer dialysis sessions per week (n = 9,503; adjusted OR, 1.26; 95% CI, 1.14-1.40; P0.001 compared with the mean odds of cardiac death for all days of the week). This daily variation in cardiac death was not seen in PD patients, in-center HD patients receiving more than 3 sessions per week (n = 251), or home HD patients (n = 573). Subgroup analyses showed that deaths related to hyperkalemia and myocardial infarction also were associated with daily variation in risk in HD patients. This pattern was not seen for vascular, infective, malignant, dialysis therapy withdrawal, or other deaths.Limited covariate adjustment. Residual confounding and coding bias could not be excluded. Possible type 2 statistical error due to limited sample size of home HD and enhanced-frequency HD cohorts.Daily variation in the pattern of cardiac deaths was observed in HD patients receiving 3 or fewer dialysis sessions per week, but not in PD, home HD, and HD patients receiving more than 3 sessions per week.
- Published
- 2013
- Full Text
- View/download PDF
109. Thousand Cankers Disease Complex: A Forest Health Issue that Threatens Juglans Species across the U.S
- Author
-
Katheryne Nix, Lisa M. Vito, Jerome F. Grant, Phillip A. Wadl, Denita Hadziabdic, Paul Merten, Bonnie H. Ownley, Gregory J. Wiggins, William E. Klingeman, Mark T. Windham, Paris L. Lambdin, and Dixie A. Daniels
- Subjects
0106 biological sciences ,Range (biology) ,walnut twig beetle ,Biological pest control ,01 natural sciences ,Juglans nigra ,law.invention ,law ,Pityophthorus juglandis ,Walnut twig beetle ,Quarantine ,Botany ,medicine ,Pterocarya spp ,fungal pathogen ,forest health ,Pterocarya ,Geosmithia morbida ,biology ,Ecology ,Forestry ,lcsh:QK900-989 ,biology.organism_classification ,medicine.disease ,eastern black walnut ,010602 entomology ,Thousand cankers disease ,insect vector ,lcsh:Plant ecology ,010606 plant biology & botany ,Juglans - Abstract
Thousand Cankers Disease (TCD) is a disease complex wherein the fungus (Geosmithia morbida) is vectored by the walnut twig beetle (WTB, Pityophthorus juglandis). The disease causes mortality primarily of eastern black walnut (Juglans nigra), although other walnut and wingnut (Pterocarya) species are also susceptible. Black walnut is native to the Eastern and Midwestern U.S. but is widely planted in western states. Total standing volume in both urban and forested settings is approximately 96 million cubic meters, and is valued at $539 billion. Although native to the Southwestern U.S., the range of WTB has expanded considerably. The spread of G. morbida coincides with that of WTB. TCD was introduced into Tennessee in 2010, and has spread to seven eastern states. Trees infected with TCD exhibit drought-like symptoms, making field detection difficult without molecular and/or morphological methods. The recently sequenced G. morbida genome will provide valuable research tools focused on understanding gene interactions between organisms involved in TCD and mechanisms of pathogenicity. With no chemical treatments available, quarantine and sanitation are preeminent options for slowing the spread of TCD, although biological control agents have been discovered. High levels of black walnut mortality due to TCD will have far-reaching implications for both eastern and western states.
- Published
- 2016
110. An Examination of a Yoga Intervention With Pediatric Burn Survivors
- Author
-
Amy S. Conn, Carolyn Memmott, Timothy A. Brusseau, Morgan S. Hall, Kristen C. Quinn, and Bradley J Wiggins
- Subjects
Male ,medicine.medical_specialty ,education ,Anxiety ,Cohort Studies ,03 medical and health sciences ,0302 clinical medicine ,Intervention (counseling) ,Surveys and Questionnaires ,medicine ,Humans ,030212 general & internal medicine ,Child ,business.industry ,Yoga ,Rehabilitation ,030208 emergency & critical care medicine ,Cognition ,humanities ,Somatic anxiety ,Test (assessment) ,Treatment Outcome ,Emergency Medicine ,Physical therapy ,Surgery ,Female ,Pediatric burn ,medicine.symptom ,business ,Burns ,human activities ,Psychosocial ,Cohort study - Abstract
Burn injuries have a major influence on the survivors' physical and psychological functioning. In pediatric burns, the consequences persist long after the injury. The objective of this study is to evaluate an existing yoga kids program to gain better understanding of the physical and psychosocial effects of a yoga practice among children with burn injuries. Thirty campers participated in a series of four (1 hour) yoga sessions during the summer of 2014. Nationally trained Instructors had taught children's yoga in the Southwestern United States for at least 10 years. A Yoga Evaluation Questionnaire, designed for children, was used to evaluate perceptions of somatic and cognitive anxiety before and after each Yoga session. Camper's age ranged from 6 to 12 years old with burn severities ranging from 5 to 75%. A dependent samples t-test was used to test for differences between composite pre- and postintervention scores for both somatic and cognitive anxiety. Significant effects emerged for somatic anxiety t(29) = -4.24, P < .001, d = 0.77, and cognitive anxiety t(29) = -4.188, P < .001, d = 0.76. For both cognitive and somatic anxiety, the postintervention composite mean scores were significantly higher, indicating a decrease in somatic and cognitive anxiety. This study suggests that participation in a Yoga program may lower perceptions of cognitive and somatic anxiety in pediatric burn survivors. Further, Yoga is one technique that may compliment the short- and long-term treatment of burn injuries.
- Published
- 2016
111. Emergence, Seasonality, and Hybridization of Laricobius nigrinus (Coleoptera: Derodontidae), an Introduced Predator of Hemlock Woolly Adelgid (Hemiptera: Adelgidae), in the Tennessee Appalachians
- Author
-
Paris L. Lambdin, James R. Rhea, Gregory J. Wiggins, Jerome F. Grant, Abdul Hakeem, A. B. Lamb Galloway, and Albert E. Mayfield
- Subjects
0106 biological sciences ,food.ingredient ,Food Chain ,Population Dynamics ,Introduced species ,Laricobius ,010603 evolutionary biology ,01 natural sciences ,Population density ,Hemiptera ,food ,Adelgidae ,Animals ,Predator ,Ecology, Evolution, Behavior and Systematics ,Derodontidae ,Ecology ,biology ,Pupa ,biology.organism_classification ,Tennessee ,Coleoptera ,010602 entomology ,Insect Science ,Larva ,Hybridization, Genetic ,Hemlock woolly adelgid ,Seasons - Abstract
From 2010 through 2013, adult emergence and seasonality of Laricobius nigrinus Fender, an introduced predatory species native to western North America, as well as hybridization with the native species Laricobius rubidus (LeConte), were evaluated using emergence traps and beat-sheet sampling in areas of previous release against hemlock woolly adelgid, Adelges tsugae Annand. The shortest emergence period of adult L. nigrinus was 7 wk beginning 22 October 2010, and the longest emergence was 15 wk beginning 17 October 2012. Native L. rubidus also were collected from emergence traps placed on the ground surface and beat-sheet samples all 3 yr, with emergence of L. rubidus initiating later than L. nigrinus each season. Seasonality of both Laricobius species was similar across a 44-mo study period. Adult L. nigrinus were present from October through April, and larvae of Laricobius spp. were collected from February to May. The average number of L. nigrinus from emergence traps was significantly greater than the average number of beetles collected from beat-sheet samples in 2010, while the converse was observed during 2012. Hybridization between L. nigrinus and L. rubidus was documented from 10.75% of specimens collected during 2010 and 2011, indicating periodic interbreeding between the introduced and native species. These findings suggest emergence trapping may be a useful method to assess establishment, population densities, and seasonality of Laricobius species in areas of release to enhance their use in management of A. tsuage.
- Published
- 2016
112. High-resolution gradient-recalled echo imaging at 9.4T using 16-channel parallel transmit simultaneous multislice spokes excitations with slice-by-slice flip angle homogenization
- Author
-
Desmond H Y, Tse, Christopher J, Wiggins, and Benedikt A, Poser
- Subjects
Adult ,Male ,simultaneous multislice ,Full Paper ,parallel transmission ,high‐resolution GRE SMS‐pTX ,Full Papers—Imaging Methodology ,Brain ,magnitude least‐squares ,Magnetic Resonance Imaging ,spokes pulses ,ultrahigh‐field MR ,Image Processing, Computer-Assisted ,Humans ,Least-Squares Analysis ,Algorithms - Abstract
Purpose In order to fully benefit from the improved signal‐to‐noise and contrast‐to‐noise ratios at 9.4T, the challenges of B1+ inhomogeneity and the long acquisition time of high‐resolution 2D gradient‐recalled echo (GRE) imaging were addressed. Theory and Methods Flip angle homogenized excitations were achieved by parallel transmission (pTx) of 3‐spoke pulses, designed by magnitude least‐squares optimization in a slice‐by‐slice fashion; the acquisition time reduction was achieved by simultaneous multislice (SMS) pulses. The slice‐specific spokes complex radiofrequency scaling factors were applied to sinc waveforms on a per‐channel basis and combined with the other pulses in an SMS slice group to form the final SMS‐pTX pulse. Optimal spokes locations were derived from simulations. Results Flip angle maps from presaturation TurboFLASH showed improvement of flip angle homogenization with 3‐spoke pulses over CP‐mode excitation (normalized root‐mean‐square error [NRMSE] 0.357) as well as comparable excitation homogeneity across the single‐band (NRMSE 0.119), SMS‐2 (NRMSE 0.137), and SMS‐3 (NRMSE 0.132) 3‐spoke pulses. The application of the 3‐spoke SMS‐3 pulses in a 48‐slice GRE protocol, which has an in‐plane resolution of 0.28 × 0.28 mm, resulted in a 50% reduction of scan duration (total acquisition time 6:52 min including reference scans). Conclusion Time‐efficient flip angle homogenized high‐resolution GRE imaging at 9.4T was accomplished by using slice‐specific SMS‐pTx spokes excitations. Magn Reson Med 78:1050–1058, 2017. © 2016 The Authors Magnetic Resonance in Medicine published by Wiley Periodicals, Inc. on behalf of International Society for Magnetic Resonance in Medicine.
- Published
- 2016
113. Volumetric imaging with homogenised excitation and static field at 9.4 T
- Author
-
Dimo Ivanov, Gunamony Shajan, Daniel Brenner, Benedikt A. Poser, Klaus Scheffler, Desmond H. Y. Tse, Christian Mirkes, Jens Hoffmann, Christopher J. Wiggins, Kâmil Uludağ, RS: FPN NPPP II, MRI, RS: FPN CN 5, and RS: FPN MaCSBio
- Subjects
Volumetric imaging ,ECHO-PLANAR ,Radio Waves ,B-0 shimming ,Contrast Media ,SUSCEPTIBILITY ,physiopathology [Brain] ,Parallel transmission ,030218 nuclear medicine & medical imaging ,Workflow ,methods [Brain Mapping] ,0302 clinical medicine ,Nuclear magnetic resonance ,pathology [Brain] ,chemistry [Contrast Media] ,Static field ,B0 shimming ,Brain Mapping ,Radiological and Ultrasound Technology ,Echo-Planar Imaging ,GRADIENT-ECHO ,Brain ,HUMAN BRAIN ,FUNCTIONAL MRI ,Radiology Nuclear Medicine and imaging ,3D EPI ,Calibration ,Research Article ,Gradient echo ,Scanner ,Materials science ,NOISE RATIO ,Field (physics) ,Acoustics ,Biophysics ,methods [Image Interpretation, Computer-Assisted] ,03 medical and health sciences ,Imaging, Three-Dimensional ,Image Interpretation, Computer-Assisted ,Humans ,Radiology, Nuclear Medicine and imaging ,ddc:530 ,GEOMETRIC DISTORTION ,NUCLEAR-MAGNETIC-RESONANCE ,diagnostic imaging [Brain] ,Flip-angle homogenisation ,Image Enhancement ,Rf excitation ,RF PULSES ,MPRAGE ,Ultra-high field MR ,methods [Image Enhancement] ,PARALLEL-TRANSMISSION ,030217 neurology & neurosurgery ,Excitation - Abstract
OBJECTIVES: To overcome the challenges of B0 and RF excitation inhomogeneity at ultra-high field MRI, a workflow for volumetric B0 and flip-angle homogenisation was implemented on a human 9.4 T scanner.MATERIALS AND METHODS: Imaging was performed with a 9.4 T human MR scanner (Siemens Medical Solutions, Erlangen, Germany) using a 16-channel parallel transmission system. B0- and B1-mapping were done using a dual-echo GRE and transmit phase-encoded DREAM, respectively. B0 shims and a small-tip-angle-approximation kT-points pulse were calculated with an off-line routine and applied to acquire T1- and T 2 (*) -weighted images with MPRAGE and 3D EPI, respectively.RESULTS: Over six in vivo acquisitions, the B0-distribution in a region-of-interest defined by a brain mask was reduced down to a full-width-half-maximum of 0.10 ± 0.01 ppm (39 ± 2 Hz). Utilising the kT-points pulses, the normalised RMSE of the excitation was decreased from CP-mode's 30.5 ± 0.9 to 9.2 ± 0.7 % with all B 1 (+) voids eliminated. The SNR inhomogeneities and contrast variations in the T1- and T 2 (*) -weighted volumetric images were greatly reduced which led to successful tissue segmentation of the T1-weighted image.CONCLUSION: A 15-minute B0- and flip-angle homogenisation workflow, including the B0- and B1-map acquisitions, was successfully implemented and enabled us to reduce intensity and contrast variations as well as echo-planar image distortions in 9.4 T images.
- Published
- 2016
- Full Text
- View/download PDF
114. Biological control as an ecologically-based pest management technique in forest systems
- Author
-
Gregory J. Wiggins
- Subjects
Integrated pest management ,Geography ,Agroforestry ,Biological pest control - Published
- 2016
- Full Text
- View/download PDF
115. The Relational Foundations of Conservation Psychology
- Author
-
Dennis C. Wendt, Joseph A. Ostenson, and Bradford J. Wiggins
- Subjects
Individualism ,Social Psychology ,Identity (social science) ,Conservation psychology ,Natural (music) ,Foundation (evidence) ,Psychology ,Social psychology ,Applied Psychology ,Epistemology - Abstract
At its heart, conservation psychology is concerned with relationships—those between humans and the natural world. However, the assumptions that psychologists make about relationships can have profound implications for the way we theorize about, empirically investigate, and intervene in relationships between humans and the natural world. To demonstrate these implications, we describe two basic ways to understand relationships, individualistic relationality and strong relationality, and their respective implications for conservation psychology. For individualistic relationality, relationships consist of fundamentally individual self-contained parts that merely interact with one another, whereas for strong relationality, relationships are at the ontological foundation of identity and existence. To more fully explicate strong relationality, we draw upon the writings of farmer, writer, and conservationist Wendell Berry. We argue that strong relationality, though it is less familiar and often overlooke...
- Published
- 2012
- Full Text
- View/download PDF
116. Recent Peritonitis Associates with Mortality among Patients Treated with Peritoneal Dialysis
- Author
-
Anna Kemp, Sunil V. Badve, Stephen P. McDonald, Neil Boudville, Wai H. Lim, Fiona G. Brown, Kathryn J. Wiggins, Kym M. Bannister, David W. Johnson, Philip A. Clayton, and Carmel M. Hawley
- Subjects
Male ,medicine.medical_specialty ,Time Factors ,medicine.medical_treatment ,Peritonitis ,Peritoneal dialysis ,Internal medicine ,medicine ,Humans ,Clinical Epidemiology ,Major complication ,Dialysis ,Aged ,Aged, 80 and over ,biology ,business.industry ,C-reactive protein ,Australia ,General Medicine ,Odds ratio ,Middle Aged ,medicine.disease ,Confidence interval ,Surgery ,Logistic Models ,Nephrology ,biology.protein ,Female ,Hemodialysis ,business ,Peritoneal Dialysis ,New Zealand - Abstract
Peritonitis is a major complication of peritoneal dialysis, but the relationship between peritonitis and mortality among these patients is not well understood. In this case-crossover study, we included the 1316 patients who received peritoneal dialysis in Australia and New Zealand from May 2004 through December 2009 and either died on peritoneal dialysis or within 30 days of transfer to hemodialysis. Each patient served as his or her own control. The mean age was 70 years, and the mean time receiving peritoneal dialysis was 3 years. In total, there were 1446 reported episodes of peritonitis with 27% of patients having ≥ 2 episodes. Compared with the rest of the year, there were significantly increased odds of peritonitis during the 120 days before death, although the magnitude of this association was much greater during the 30 days before death. Compared with a 30-day window 6 months before death, the odds for peritonitis was six-fold higher during the 30 days immediately before death (odds ratio, 6.2; 95% confidence interval, 4.4-8.7). In conclusion, peritonitis significantly associates with mortality in peritoneal dialysis patients. The increased odds extend up to 120 days after an episode of peritonitis but the magnitude is greater during the initial 30 days.
- Published
- 2012
- Full Text
- View/download PDF
117. Polycrystalline diamond cutters sintered with magnesium carbonate in cubic anvil press
- Author
-
J. Qian, D.K. Mukhopadhyay, Michael A. Vail, J. Wiggins, Kenneth E. Bertagnolli, and C.E. McMurray
- Subjects
Diffraction ,Materials science ,Flexural strength ,chemistry ,Machining ,Magnesium ,Scanning electron microscope ,Superhard material ,Metallurgy ,Sintering ,chemistry.chemical_element ,Thermal stability - Abstract
Polycrystalline diamond cutters (PDC) were sintered with magnesium carbonate (MgCO 3 ) around 8 GPa and 2200–2400 °C in a single-stage cubic anvil press. Different analyzing techniques such as X-ray diffraction (XRD), scanning electron microscopy (SEM), and energy-dispersive X-ray spectroscopy (EDS) were applied to characterize the micro-structure, sintering behavior, and composition of the diamond-MgCO 3 system. Wear resistance, thermal stability, and rupture strength of MgCO 3 -sintered PDC were compared against conventional cobalt-sintered PDC. An improvement in performance was observed from our laboratory tests, which may enable MgCO 3 -sintered PDC to be a functional superhard material for the cutting, drilling, and machining industries.
- Published
- 2012
- Full Text
- View/download PDF
118. Repeated Peritoneal Dialysis–Associated Peritonitis: A Multicenter Registry Study
- Author
-
Stephen P. McDonald, Carmel M. Hawley, Thulasi Thirugnanasambathan, Philip A. Clayton, Sunil V. Badve, David W. Johnson, Fiona G. Brown, Neil Boudville, Kym M. Bannister, and Kathryn J. Wiggins
- Subjects
Male ,medicine.medical_specialty ,medicine.medical_treatment ,Peritonitis ,Logistic regression ,Peritoneal dialysis ,Cohort Studies ,Recurrence ,Internal medicine ,medicine ,Humans ,Registries ,Dialysis ,business.industry ,Mortality rate ,Confounding ,Australia ,Middle Aged ,medicine.disease ,Surgery ,Nephrology ,Female ,Hemodialysis ,business ,Peritoneal Dialysis ,Cohort study - Abstract
Background Determinants and outcomes of peritoneal dialysis (PD)-associated peritonitis occurring within 4 weeks of completion of therapy of a prior episode caused by the same (relapse) or different organism (recurrence) recently have been characterized. However, determinants and outcomes of peritonitis occurring more than 4 weeks after treatment of a prior episode caused by the same (repeated) or different organism (nonrepeated) are poorly understood. Study Design Observational cohort study using Australia and New Zealand Dialysis and Transplant Registry (ANZDATA) data. Setting & Participants All Australian PD patients between October 1, 2003, and December 31, 2007, with first episodes of repeated or nonrepeated peritonitis. Predictors Repeated versus nonrepeated peritonitis, according to International Society of PD (ISPD) criteria. Outcomes & Measurements Relapse, hospitalization, catheter removal, hemodialysis transfer, and death. Results After a peritonitis episode, the probability that a subsequent episode represented repeated rather than nonrepeated peritonitis was highest in the second month (41%), then progressively decreased to a stable level of 14% from 6 months onward. When first episodes of repeated (n = 245) or nonrepeated peritonitis (n = 824) were analyzed, repeated peritonitis was predicted independently by a shorter elapsed time from the prior episode (adjusted OR per day elapsed, 0.91; 95% CI, 0.88-0.94). Staphylococcus aureus and coagulase-negative staphylococcus were isolated more frequently in repeated peritonitis, whereas Gram-negative, streptococcal, and fungal organisms were recovered more frequently in nonrepeated peritonitis. Using multivariate logistic regression, repeated peritonitis was associated independently with higher relapse (OR, 5.41; 95% CI, 3.72-7.89) and lower hospitalization rates (OR, 0.63; 95% CI, 0.46-0.85), but catheter removal, hemodialysis transfer, and death rates similar to nonrepeated peritonitis. Limitations Limited covariate adjustment. Residual confounding and coding bias could not be excluded. Conclusions Repeated and nonrepeated peritonitis episodes are caused by different spectra of micro-organisms and have different outcomes. Study findings suggest that the ISPD definition for repeated peritonitis should be limited to 6 months.
- Published
- 2012
- Full Text
- View/download PDF
119. PO-0894: Comparing the spatial integrity of 7 T and 3 T MR images for image-guided radiotherapy of brain tumors
- Author
-
F.M. Janssen, Jurgen Peerlings, Inge Compter, Felix M. Mottaghy, Aswin L. Hoffmann, P. Lambin, and Christopher J. Wiggins
- Subjects
Oncology ,business.industry ,Medicine ,Radiology, Nuclear Medicine and imaging ,Hematology ,Mr images ,business ,Nuclear medicine ,Image guided radiotherapy - Published
- 2017
- Full Text
- View/download PDF
120. Effect of Dialysis Modality on Survival of Hepatitis C-Infected ESRF Patients
- Author
-
Carmel M. Hawley, Sunil V. Badve, Fiona G. Brown, Neil Boudville, Kym M. Bannister, Bhadran Bose, Philip A. Clayton, David W. Johnson, Stephen P. McDonald, and K. J. Wiggins
- Subjects
Adult ,medicine.medical_specialty ,Time Factors ,Epidemiology ,medicine.medical_treatment ,Critical Care and Intensive Care Medicine ,Risk Assessment ,Peritoneal dialysis ,Renal Dialysis ,Risk Factors ,Internal medicine ,medicine ,Humans ,Registries ,Survival rate ,Dialysis ,Aged ,Proportional Hazards Models ,Retrospective Studies ,Transplantation ,Chi-Square Distribution ,business.industry ,Proportional hazards model ,Mortality rate ,Hazard ratio ,Australia ,Original Articles ,Hepatitis C ,Hepatitis C Antibodies ,Middle Aged ,medicine.disease ,Survival Analysis ,Surgery ,Survival Rate ,Treatment Outcome ,Nephrology ,Kidney Failure, Chronic ,Hemodialysis ,business ,Peritoneal Dialysis ,Biomarkers ,New Zealand - Abstract
Summary Background and objectives Hepatitis C virus (HCV) infection is associated with increased mortality and morbidity in end-stage renal failure (ESRF) patients. Despite a lower incidence and risk of transmission of HCV infection with peritoneal dialysis (PD), the optimal dialysis modality for HCV-infected ESRF patients is not known. The aim of this study was to evaluate the impact of dialysis modality on the survival of HCV-infected ESRF patients. Design, setting, participants, & measurements The study included all adult incident ESRF patients in Australia and New Zealand who commenced dialysis between January 1, 1994, and December 31, 2008, and were HCV antibody-positive at the time of dialysis commencement. Time to all-cause mortality was compared between hemodialysis (HD) and PD according to modality assignment at day 90, using Cox proportional hazards model analysis. Results A total of 424 HCV-infected ESRF patients commenced dialysis during the study period and survived for at least 90 days (PD n = 134; HD n = 290). Mortality rates were comparable between PD and HD in the first year (10.7 versus 13.8 deaths per 100 patient-years, respectively; adjusted hazard ratio [HR] 0.65, 95% CI 0.34 to 1.26) and thereafter (20 versus 15.9 deaths per 100 patient-years, respectively; HR 1.27, 95% CI 0.86 to 1.88). Conclusions The survival of HCV-infected ESRF patients is comparable between PD and HD.
- Published
- 2011
- Full Text
- View/download PDF
121. Initial Assessment of Thousand Cankers Disease on Black Walnut, Juglans nigra, in Eastern Tennessee
- Author
-
Paris L. Lambdin, Gregory J. Wiggins, Walker G. Haun, Mark T. Windham, and Jerome F. Grant
- Subjects
Geosmithia morbida ,Veterinary medicine ,biology ,Incidence (epidemiology) ,Forestry ,Fungal pathogen ,biology.organism_classification ,medicine.disease ,Geography ,Walnut twig beetle ,Thousand cankers disease ,Botany ,cardiovascular system ,medicine ,Juglans - Abstract
In 2010, thousand cankers disease (TCD) was documented in Tennessee, representing the first confirmation of this disease in the native range of black walnut and the first known incidence of TCD east of Colorado. Tennessee Department of Agriculture personnel conducted surveys to determine the extent of TCD in counties in eastern Tennessee. Samples of symptomatic black walnuts were sent to the University of Tennessee for processing. The causative agents, walnut twig beetle, Pityophthorus juglandis, and the fungal pathogen Geosmithia morbida, were documented on the same trees in four counties. Tree mortality was observed in two counties, and tree decline was observed in at least 10 counties although it may be attributed to previous droughts or to TCD. In 2010, four confirmed counties were quarantined by TDA, and 10 buffer counties were also regulated. Research is underway to further assess the incidence and impact of TCD on black walnut in Tennessee.
- Published
- 2011
- Full Text
- View/download PDF
122. Direct visualization of non-human primate subcortical nuclei with contrast-enhanced high field MRI
- Author
-
Bechir Jarraya, Stéphane Palfi, Denis Le Bihan, Hirokazu Iwamuro, Olivier Joly, Wim Vanduffel, Lynn Uhrig, Naoki Tani, Cyril Poupon, Christopher J. Wiggins, and Hauke Kolster
- Subjects
Male ,Aging ,Deep brain stimulation ,Cognitive Neuroscience ,medicine.medical_treatment ,media_common.quotation_subject ,Individuality ,Signal-To-Noise Ratio ,Basal Ganglia ,Subthalamic Nucleus ,Basal ganglia ,Image Processing, Computer-Assisted ,medicine ,Animals ,Contrast (vision) ,Probability ,media_common ,Brain Mapping ,Non human primate ,business.industry ,Macaca mulatta ,Magnetic Resonance Imaging ,Electrophysiological Phenomena ,Visualization ,Subthalamic nucleus ,Electrophysiology ,Neurology ,Female ,Brainstem ,business ,Microelectrodes ,Neuroscience ,Algorithms ,Brain Stem - Abstract
Subcortical nuclei are increasingly targeted for deep brain stimulation (DBS) and for gene transfer to treat neurological and psychiatric disorders. For a successful outcome in patients, it is critical to place DBS electrodes or infuse viral vectors accurately within targeted nuclei. However current MRI approaches are still limited to localize brainstem and basal ganglia nuclei accurately. By combining ultra-high resolution structural MRI and contrast-enhanced MRI using iron oxide nanoparticles at high field (3 T and 7 T), we could precisely locate the subcortical nuclei, in particular the subthalamic nucleus in macaques, and validate this location by intracranial electrophysiological mapping. The present data pave the way to a clinical application.
- Published
- 2011
- Full Text
- View/download PDF
123. Initial Assessment of Thousand Cankers Disease on Black Walnut, Juglans nigra, in Eastern Tennessee
- Author
-
Gregory J. Wiggins, Paris L. Lambdin, Walker G. Haun, Mark T. Windham, and Jerome F. Grant
- Subjects
Pityophthorus juglandis ,walnut twig beetle ,Geosmithia morbida ,cardiovascular system ,distribution ,lcsh:Plant ecology ,insect/fungal interactions ,native range ,lcsh:QK900-989 ,forest threat - Abstract
In 2010, thousand cankers disease (TCD) was documented in Tennessee, representing the first confirmation of this disease in the native range of black walnut and the first known incidence of TCD east of Colorado. Tennessee Department of Agriculture personnel conducted surveys to determine the extent of TCD in counties in eastern Tennessee. Samples of symptomatic black walnuts were sent to the University of Tennessee for processing. The causative agents, walnut twig beetle, Pityophthorus juglandis, and the fungal pathogen Geosmithia morbida, were documented on the same trees in four counties. Tree mortality was observed in two counties, and tree decline was observed in at least 10 counties although it may be attributed to previous droughts or to TCD. In 2010, four confirmed counties were quarantined by TDA, and 10 buffer counties were also regulated. Research is underway to further assess the incidence and impact of TCD on black walnut in Tennessee.
- Published
- 2011
124. Gut of Red-backed Salamanders (Plethodon cinereus) May Serve as a Reservoir for an Antifungal Cutaneous Bacterium
- Author
-
Kevin P. C. Minbiole, Patrick J. Wiggins, Reid N. Harris, and Jacob M. Smith
- Subjects
Amphibian ,biology ,Ecology ,Fungus ,Secondary metabolite ,biology.organism_classification ,Microbiology ,Plethodon cinereus ,biology.animal ,medicine ,Salamander ,Animal Science and Zoology ,Janthinobacterium lividum ,Pathogen ,Ecology, Evolution, Behavior and Systematics ,Bacteria ,medicine.drug - Abstract
Janthinobacterium lividum, a bacterium that inhibits the growth of the lethal amphibian pathogen Batrachochytrium dendrobatidis, has been found in myriad environments, including the skins of amphibians that resist the fungus. We present evidence that the gastrointestinal tract of Plethodon cinereus, the Eastern Red-backed Salamander, can serve as a reservoir for J. lividum. Two of six individuals collected from a natural environment harbored J. lividum in the gut tube. Violacein, whose intense violet color allows for rapid visual detection and chemical analysis, served as a first indicator for the presence of J. lividum. This secondary metabolite of J. lividum was confirmed through reverse-phase high performance liquid chromatography, UV-Vis analysis, and high-resolution mass spectrometry. The identity of J. lividum was confirmed by PCR amplification with J. lividum-specific primers of DNA extracted from the isolated bacteria. Because J. lividum survives in the digestive tract, it will likely be inoculated onto skin around the cloaca and into the soil and indirectly onto salamander skins. Thus, the gut may act as an important reservoir for this antifungal bacterium.
- Published
- 2011
- Full Text
- View/download PDF
125. Establishment and coexistence of two predators,Laricobius nigrinusandSasajiscymnus tsugae,introduced against hemlock woolly adelgid on eastern hemlock
- Author
-
Paris L. Lambdin, Abdul Hakeem, Gregory J. Wiggins, Jerome F. Grant, and James R. Rhea
- Subjects
biology ,Ecology ,Insect Science ,Laricobius nigrinus ,Hemlock woolly adelgid ,Sasajiscymnus tsugae ,Adelges tsugae ,biology.organism_classification ,Agronomy and Crop Science ,Laricobius rubidus ,Predator ,Predation - Abstract
The coexistence of two introduced predatory species, Laricobius nigrinus Fender and Sasajiscymnus tsugae (Sasaji and McClure), and a native predator, L. rubidus LeConte, on eastern hemlock was documented for the first time. Details of their coexistence and implications to management of hemlock woolly adelgid, Adelges tsugae Annand, are discussed.
- Published
- 2011
- Full Text
- View/download PDF
126. Use of aminoglycosides for peritoneal dialysis-associated peritonitis does not affect residual renal function
- Author
-
Neil Boudville, Stephen P. McDonald, Kathryn J. Wiggins, Sunil V. Badve, Carmel M. Hawley, David W. Johnson, Fiona G. Brown, and Kym M. Bannister
- Subjects
Male ,medicine.medical_specialty ,medicine.drug_class ,medicine.medical_treatment ,Antibiotics ,Peritonitis ,Renal function ,Bacteremia ,Kidney ,Gastroenterology ,Peritoneal dialysis ,Risk Factors ,Interquartile range ,Internal medicine ,Humans ,Medicine ,Transplantation ,business.industry ,Aminoglycoside ,Middle Aged ,Prognosis ,medicine.disease ,Surgery ,Aminoglycosides ,medicine.anatomical_structure ,Nephrology ,Kidney Failure, Chronic ,Female ,business ,Peritoneal Dialysis ,Follow-Up Studies ,Glomerular Filtration Rate - Abstract
Aminoglycosides offer several potential benefits in their treatment of peritoneal dialysis (PD)-associated peritonitis, including low cost, activity against Gram-negative organisms (including Pseudomonas aeruginosa), synergistic bactericidal activity against some Gram-positive organisms (such as Staphylococci) and relatively low propensity to promote antimicrobial resistance. However, there is limited conflicting evidence that aminoglycosides may accelerate loss of residual renal function (RRF) in PD patients. The aim of this study was to study the effect of aminoglycoside use on slope of decline in RRF.The study included 2715 Australian patients receiving PD between October 2003 and December 2007 in whom at least two measurements of renal creatinine clearance were available. Patients were divided according to tertiles of slope of RRF decline (rapid, intermediate and slow). The primary outcome was the slope of RRF over time in patients who received aminoglycosides for PD peritonitis versus those who did not.A total of 1412 patients (52%) experienced at least one episode of PD peritonitis. An aminoglycoside was used as the initial empiric antibiotic in 1075 patients. The slopes of RRF decline were similar in patients treated and not treated with at least one course of aminoglycoside (median [interquartile range] -0.26 [-1.17 to 0.04] mL/min/1.73 m(2)/month versus -0.22 [-1.11 to 0.01] mL/min/1.73 m(2)/month, P = 0.9). The slopes of RRF decline were also similar in patients receiving repeated courses of aminoglycoside.Empiric treatment with aminoglycoside for peritonitis was not associated with an adverse effect on RRF in PD patients.
- Published
- 2011
- Full Text
- View/download PDF
127. Confronting the dilemma of mixed methods
- Author
-
Bradford J. Wiggins
- Subjects
Dilemma ,Philosophy ,Philosophy of science ,Multimethodology ,Pluralism (philosophy) ,Social science ,Psychology ,General Psychology ,Qualitative research ,Epistemology - Published
- 2011
- Full Text
- View/download PDF
128. Spatial Prediction of Habitat Overlap of Introduced and Native Thistles to Identify Potential Areas of Nontarget Activity of Biological Control Agents
- Author
-
F. T. van Manen, Jerome F. Grant, Gregory J. Wiggins, John B. Wilkerson, Jack W. Ranney, and Paris L. Lambdin
- Subjects
food.ingredient ,Weed Control ,Introduced species ,Carduus nutans ,Biology ,Cirsium ,Models, Biological ,Host Specificity ,Trichosirocalus horridus ,Cirsium vulgare ,food ,Animals ,Herbivory ,Cirsium carolinianum ,Ecology, Evolution, Behavior and Systematics ,Geography ,Ecology ,Rhinocyllus conicus ,biology.organism_classification ,Tennessee ,food.food ,Carduus ,Insect Science ,Thistle ,Weevils ,Introduced Species - Abstract
Nontarget feeding of Rhinocyllus conicus Fröelich and Trichosirocalus horridus (Panzer) on native North American thistles in the genus Cirsium has been documented. Some species of these native thistles have shown greater infestation levels of R. conicus in populations that are in close proximity to the target plant species, Carduus nutans L. In 2005 a study was initiated to identify areas of potential nontarget feeding by R. conicus and T. horridus on thistle species by predicting habitats of two known introduced hosts [C. nutans and Cirsium vulgare (Savi) Tenore] and two native species [Cirsium carolinianum (Walter) Fernald and Schubert and C. discolor (Muhlenberg ex Willdenow) Sprengel] using Mahalanobis distance (D(2)). Cumulative frequency graphs showed that the D(2) models for all four plant species effectively identified site conditions that contribute to the presence of the respective species. Poisson regression showed an association between D(2) values and plant counts at field-test sites for C. nutans and C. carolinianum. However, negative binomial regression detected no association between D(2) values and plant counts for C. discolor or C. vulgare. Chi-square analysis indicated associations between both weevil species and sites where C. vulgare and Carduus nutans were found, but not between the weevil and native thistle species. Habitats of C. nutans and Cirsium carolinianum overlapped in ≈12% of the study area. Data-based habitat models may provide a powerful tool for land managers and scientists to monitor native plant populations for nontarget feeding by introduced biological control agents.
- Published
- 2010
- Full Text
- View/download PDF
129. Predictors, treatment, and outcomes of non-Pseudomonas Gram-negative peritonitis
- Author
-
Johan B. Rosman, Kathryn J. Wiggins, David W. Johnson, Kym M. Bannister, Fiona G. Brown, Carmel M. Hawley, Stephen P. McDonald, and Elizabeth Jarvis
- Subjects
Male ,medicine.medical_specialty ,medicine.drug_class ,medicine.medical_treatment ,Antibiotics ,Peritonitis ,continuous ambulatory peritoneal dialysis ,antibiotics ,Peritoneal dialysis ,Risk Factors ,Internal medicine ,Humans ,Medicine ,Registries ,Risk factor ,bacteria ,Survival rate ,Aged ,business.industry ,microbiology ,Remission Induction ,Continuous ambulatory peritoneal dialysis ,Age Factors ,Australia ,Middle Aged ,Prognosis ,medicine.disease ,Anti-Bacterial Agents ,Surgery ,Survival Rate ,Treatment Outcome ,Nephrology ,Female ,Hemodialysis ,Gram-Negative Bacterial Infections ,business ,Complication ,Peritoneal Dialysis ,enterobacteriaceae - Abstract
Non-Pseudomonas Gram-negative (NPGN) peritonitis is a frequent, serious complication of peritoneal dialysis; however, previous reports have been limited to small, single-center studies. To gain insight on the frequency, predictors, treatment, and outcomes of NPGN peritonitis, we analyzed data in the ANZDATA registry of all adult Australian peritoneal dialysis patients over a 39-month period using multivariate logistic and multilevel Poisson regressions. There were 837 episodes of NPGN peritonitis (23.3% of all peritonitis) that occurred in 256 patients. The most common organism isolated was Escherichia coli, but included Klebsiella, Enterobacter, Serratia, Acinetobacter, Proteus, and Citrobacter, with multiple organisms identified in a quarter of the patients. The principal risk factor was older age, with poorer clinical outcome predicted by older age and polymicrobial peritonitis. The overall antibiotic cure rate was 59%. NPGN peritonitis was associated with significantly higher risks of hospitalization, catheter removal, permanent transfer to hemodialysis, and death compared to other organisms contributing to peritonitis. Underlying bowel perforation requiring surgery was uncommon. Hence, we show that NPGN peritonitis is a frequent, serious complication of peritoneal dialysis, which is frequently associated with significant risks, including death. Its cure with antibiotics alone is less likely when multiple organisms are involved.
- Published
- 2010
- Full Text
- View/download PDF
130. Recovery ofSasajiscymnus tsugae, released against hemlock woolly adelgid,Adelges tsugae,in the southern Appalachians
- Author
-
Gregory J. Wiggins, Abdul Hakeem, Paris L. Lambdin, Frank A. Hale, Glenn Taylor, James R. Rhea, Jerome F. Grant, and David S. Buckley
- Subjects
biology ,Ecology ,business.industry ,National park ,Biological pest control ,Pest control ,biology.organism_classification ,Invasive species ,Predation ,Insect Science ,Coccinellidae ,Adelgidae ,Hemlock woolly adelgid ,business ,Agronomy and Crop Science - Abstract
Eastern hemlock in the Great Smoky Mountains National Park is currently threatened by the hemlock woolly adelgid, Adelges tsugae Annand (Hemiptera: Adelgidae). As part of a management plan against this invasive insect pest, about 350,000 adults of the predatory beetle Sasajiscymnus tsugae (Sasaji and McClure) (Coleoptera: Coccinellidae) were released at ca. 150 sites in the Park from 2002 to 2007. Of these adult release sites, 33 were sampled in 2008 and 2009 using beat-sheet sampling for 4 man-hours. Sasajiscymnus tsugae adults (n=78) and/or larvae (n=145) were recovered from seven sites (21.2% of the release sites sampled). Recovery of S. tsugae was significantly associated with older release sites, with the most beetles recovered from 2002 release sites. These results indicate that S. tsugae may require more time (i.e., 5–7 years) than anticipated for population densities to reach readily detectable levels in some areas.
- Published
- 2010
- Full Text
- View/download PDF
131. Review of 'Are We Ready for Our Close-Up? Why and How We Must Embrace Video in the OR' by Langerman A, Grantcharov TP in Ann Surg 266
- Author
-
Larry H. Hollier and Claire J. Wiggins
- Subjects
03 medical and health sciences ,0302 clinical medicine ,Otorhinolaryngology ,business.industry ,Aesthetics ,030220 oncology & carcinogenesis ,Medicine ,030211 gastroenterology & hepatology ,Surgery ,General Medicine ,business - Published
- 2018
- Full Text
- View/download PDF
132. Review of 'Why Do General Surgeons Decide to Retire? A Population-Level Survey' by Poushay HM, Kagedan DJ, Hallet J, Conn LG, Beyfuss K, Nadler A, Ahmed N, Wright FC in Ann Surg 267
- Author
-
Claire J. Wiggins and Larry H. Hollier
- Subjects
Wright ,Otorhinolaryngology ,Population level ,business.industry ,Medicine ,Surgery ,General Medicine ,business ,Humanities - Published
- 2018
- Full Text
- View/download PDF
133. Staphylococcus Aureus Peritonitis in Australian Peritoneal Dialysis Patients: Predictors, Treatment, and Outcomes in 503 Cases
- Author
-
Johan B. Rosman, Kathryn J. Wiggins, S. Govindarajulu, Carmel M. Hawley, David W. Johnson, Kym M. Bannister, Fiona G. Brown, and Stephen P. McDonald
- Subjects
Male ,Methicillin-Resistant Staphylococcus aureus ,Staphylococcus aureus ,medicine.medical_specialty ,medicine.medical_treatment ,Cefazolin ,Peritonitis ,medicine.disease_cause ,Staphylococcal infections ,Peritoneal dialysis ,Anti-Infective Agents ,Recurrence ,Vancomycin ,Internal medicine ,medicine ,Humans ,Aged ,business.industry ,Australia ,General Medicine ,Middle Aged ,Staphylococcal Infections ,medicine.disease ,Methicillin-resistant Staphylococcus aureus ,Surgery ,Treatment Outcome ,Nephrology ,Female ,Hemodialysis ,business ,Peritoneal Dialysis ,Empiric therapy ,medicine.drug - Abstract
Staphylococcus aureus peritonitis is a serious complication of peritoneal dialysis (PD). Since reports of the course and treatment of S. aureus peritonitis have generally been limited to small, single-center studies, the aim of the current investigation was to examine the frequency, predictors, treatment, and clinical outcomes of this condition in all 4675 patients receiving PD in Australia between 1 October 2003 and 31 December 2006. 3594 episodes of peritonitis occurred in 1984 patients and 503 (14%) episodes of S. aureus peritonitis occurred in 355 (8%) individuals. 273 (77%) patients experienced 1 episode of S. aureus peritonitis, 52 (15%) experienced 2 episodes, 19 (5%) experienced 3 episodes, and 11 (3%) experienced 4 or more episodes. The predominant antibiotics used as initial empiric therapy were vancomycin (61%) and cephazolin (31%). Once S. aureus was isolated and identified, the prescription of vancomycin did not appreciably change for methicillin-sensitive S. aureus (MSSA) peritonitis (59%) and increased for methicillin-resistant S. aureus (MRSA) peritonitis (84%). S. aureus peritonitis was associated with a higher rate of relapse than non-S. aureus peritonitis (20% vs 13%, p < 0.001) but comparable rates of hospitalization (67% vs 70%, p = 0.2), catheter removal (23% vs 21%, p = 0.4), hemodialysis transfer (18% vs 18%, p = 0.6), and death (2.2% vs 2.3%, p = 0.9). MRSA peritonitis was independently predictive of an increased risk of permanent hemodialysis transfer [odds ratio (OR) 2.11, 95% confidence interval (CI) 1.17 – 3.82] and tended to be associated with an increased risk of hospitalization (OR 2.00, 95% CI 0.96 – 4.19). The initial empiric antibiotic choice between vancomycin and cephazolin was not significantly associated with clinical outcomes, but serious adverse outcomes were more likely if vancomycin was not used for subsequent treatment of MRSA peritonitis. In conclusion, S. aureus peritonitis is a serious complication of PD, involves a small proportion of patients, and is associated with a high rate of relapse and repeat episodes. Other adverse clinical outcomes are similar to those for peritonitis overall but are significantly worse for MRSA peritonitis. Empiric initial therapy with either vancomycin or cephazolin results in comparable outcomes, provided vancomycin is prescribed when MRSA is isolated and identified.
- Published
- 2010
- Full Text
- View/download PDF
134. Coagulase-negative staphylococcal peritonitis in Australian peritoneal dialysis patients: predictors, treatment and outcomes in 936 cases
- Author
-
Johan B. Rosman, Kathryn J. Wiggins, Fiona G. Brown, Kym M. Bannister, David W. Johnson, Carmel M. Hawley, Magid Fahim, and Stephen P. McDonald
- Subjects
Adult ,Coagulase ,Male ,medicine.medical_specialty ,medicine.medical_treatment ,Peritonitis ,Peritoneal dialysis ,Internal medicine ,medicine ,Humans ,Prospective Studies ,Dialysis ,Aged ,Transplantation ,business.industry ,Australia ,Odds ratio ,Middle Aged ,Staphylococcal Infections ,medicine.disease ,Anti-Bacterial Agents ,Surgery ,Regimen ,Logistic Models ,Treatment Outcome ,Nephrology ,Female ,Hemodialysis ,Complication ,business ,Peritoneal Dialysis ,Kidney disease - Abstract
Coagulase-negative staphylococcal (CNS) peritonitis is the most common cause of peritoneal dialysis (PD)-associated peritonitis. Previous reports of this important condition have been sparse and generally limited to single-centre studies.The frequency, predictors, treatment and clinical outcomes of CNS peritonitis were examined by multivariate logistic regression and multilevel Poisson regression in all adult PD patients in Australia between 2003 and 2006.A total of 936 episodes of CNS peritonitis (constituting 26% of all peritonitis episodes) occurred in 620 individuals. The observed rate of CNS peritonitis was 0.16 episodes per patient-year. Lower rates of CNS peritonitis were independently predicted by Asian racial origin (adjusted odds ratio [OR], 0.52; 95% CI, 0.35-0.79), renovascular nephrosclerosis (OR, 0.40; 95% CI, 0.18-0.86), early referral to a renal unit prior to dialysis commencement (OR, 0.38; 95% CI, 0.19-0.79) and treatment with automated PD at any time during the PD career (OR, 0.79; 95% CI, 0.66-0.96). The majority of CNS peritonitis episodes were initially treated with intraperitoneal vancomycin or cephazolin in combination with gentamicin. This regimen was changed in 533 (57%) individuals after a median period of 3 days, most commonly to vancomycin monotherapy. The median total antibiotic course duration was 14 days. Compared with other forms of peritonitis, CNS episodes were significantly more likely to be cured by antibiotics alone (76 vs 64%, P0.001) and less likely to be complicated by hospitalization (61 vs 73%, P0.001), catheter removal (10 vs 26%, P0.001), temporary haemodialysis (2 vs 5%, P0.001), permanent haemodialysis transfer (9 vs 21%, P0.001) and death (1.0 vs 2.7%, P = 0.002). CNS peritonitis was also associated with a shorter duration of hospitalization, a longer time to catheter removal and a shorter duration of temporary haemodialysis. Catheter removal and permanent haemodialysis transfer were independently predicted by polymicrobial peritonitis and initial empiric administration of vancomycin (compared with cephalosporins). CNS peritonitis was associated with a higher relapse rate (17 vs 13%, P = 0.003) and relapsed CNS peritonitis was associated with a higher catheter removal rate (22 vs 7%, P0.001). Repeat peritonitis occurred in 194 (31%) individuals and the highest risk was in the second month after completion of antibiotic treatment for CNS peritonitis (OR, 1.87; 95% CI, 1.39-2.51 compared with2 months).CNS peritonitis is a common complication with a relatively benign outcome compared with other forms of PD-associated peritonitis. Relapsed and repeat peritonitis are relatively common and are associated with worse outcomes.
- Published
- 2010
- Full Text
- View/download PDF
135. Superior survival of high transporters treated with automated versus continuous ambulatory peritoneal dialysis
- Author
-
Sunil V. Badve, Johan B. Rosman, Stephen P. McDonald, David W. Johnson, Kym M. Bannister, Fiona G. Brown, Carmel M. Hawley, and Kathryn J. Wiggins
- Subjects
Adult ,Male ,medicine.medical_specialty ,Treatment outcome ,Biological Transport, Active ,Kaplan-Meier Estimate ,Peritoneal equilibration test ,Permeability ,Automation ,Peritoneal Dialysis, Continuous Ambulatory ,Risk Factors ,Humans ,Medicine ,Registries ,Aged ,Proportional Hazards Models ,Transplantation ,business.industry ,Continuous ambulatory peritoneal dialysis ,Australia ,Patient survival ,Middle Aged ,Surgery ,Automated peritoneal dialysis ,Treatment Outcome ,Nephrology ,Kidney Failure, Chronic ,Female ,Peritoneum ,Dialisis peritoneal ,business ,Peritoneal Dialysis ,New Zealand - Abstract
Automated peritoneal dialysis (APD) is widely recommended for the management of high transporters by the International Society of Peritoneal Dialysis (ISPD), although there have been no adequate studies to date comparing the outcomes of APD and continuous ambulatory peritoneal dialysis (CAPD) in this high risk group.The relative impact of APD versus CAPD on patient and technique survival rates was examined by both intention-to-treat (PD modality at Day 90) and 'as-treated' time-varying Cox proportional hazards model analyses in all patients who started PD in Australia or New Zealand between 1 April 1999 and 31 March 2004 and who had baseline peritoneal equilibration tests confirming the presence of high peritoneal transport status.During the study period, 4128 patients commenced PD. Of these, 628 patients were high transporters on PD at Day 90 (486 on APD and 142 on CAPD). Compared to high transporters treated with CAPD, APD-treated high transporters were more likely to be younger and Caucasian, and less likely to be diabetic. On multivariate intention-to-treat analysis, APD treatment was associated with superior survival [adjusted hazard ratio (HR) 0.56, 95% confidence interval (CI) 0.35-0.87] and comparable death-censored technique survival (HR 0.88, 95% CI 0.64-1.21). Superior survival of high transporters treated with APD versus CAPD was also confirmed in supplemental as-treated analysis (HR 0.72, 95% CI 0.54-0.96), matched case-control analysis (HR 0.60, 95% CI 0.36-0.96) and subgroup analysis of high transporters treated entirely with APD versus those treated entirely with CAPD (HR 0.29, 95% CI 0.14-0.60). There were no statistically significant differences in patient survival or death-censored technique survival between APD and CAPD for any other transport group, except for low transporters, who experienced a higher mortality rate on APD compared with CAPD (HR 2.19, 95% CI 1.02-4.70).APD treatment is associated with a significant survival advantage in high transporters compared with CAPD. However, APD treatment is associated with inferior survival in low transporters.
- Published
- 2010
- Full Text
- View/download PDF
136. First documentation of adultTrichosirocalus horriduson several non-target nativeCirsiumspecies in Tennessee
- Author
-
Jack W. Ranney, Gregory J. Wiggins, Paris L. Lambdin, Jerome F. Grant, and John B. Wilkerson
- Subjects
food.ingredient ,biology ,Biological pest control ,Carduus nutans ,Introduced species ,biology.organism_classification ,Invasive species ,Trichosirocalus horridus ,food ,Cirsium ,Insect Science ,Curculionidae ,Botany ,Thistle ,Agronomy and Crop Science - Abstract
Releases of Trichosirocalus horridus (Panzer) (Coleoptera: Curculionidae), native to Europe, began in Tennessee in 1989 as part of a biological control program against musk thistle (Carduus nutans L.). In surveys conducted to investigate non-target feeding of T. horridus on native Cirsium thistle species from 2005 to 2008, adults of T. horridus were observed on all five native Cirsium thistles. These adult occurrences are the first documentation of T. horridus occurring on three of these native species [C. carolinianum (Walt.) Fern & Schub., C. horridulum Michx. and C. muticum Michx.], and the first record of T. horridus occurring in the Great Smoky Mountains National Park. While C. carolinianum and C. horridulum did not show symptoms of larval feeding in the meristematic tissues, C. altissimum, C. discolor, and C. muticum all had damaged meristems and possible oviposition scars on the midribs of the leaves. However, the impact of feeding by larvae of T. horridus on the reproductive potential of ...
- Published
- 2009
- Full Text
- View/download PDF
137. Predictors and outcomes of fungal peritonitis in peritoneal dialysis patients
- Author
-
David W. Johnson, Kym M. Bannister, Stephen P. McDonald, Carmel M. Hawley, R. Miles, Fiona G. Brown, Kathryn J. Wiggins, and Johan B. Rosman
- Subjects
Adult ,Male ,medicine.medical_specialty ,Time Factors ,medicine.drug_class ,Bacterial Peritonitis ,medicine.medical_treatment ,Antibiotics ,Peritonitis ,Context (language use) ,yeast ,outcomes ,Gastroenterology ,Peritoneal dialysis ,Internal medicine ,Medicine ,Humans ,Poisson Distribution ,peritonitis ,Mycosis ,Aged ,Candida ,business.industry ,fungus ,Australia ,Middle Aged ,medicine.disease ,Surgery ,Logistic Models ,Mycoses ,Nephrology ,Female ,antifungal agents ,Hemodialysis ,business ,Complication ,Peritoneal Dialysis - Abstract
Fungal peritonitis is a serious complication of peritoneal dialysis but previous reports on this have been limited to small, single-center studies. Using all Australian peritoneal dialysis patients, we measured predictors, treatments, and outcomes of this condition by logistic regression and multilevel, multivariate Poisson regression. This encompassed 66 centers over a 4-year period that included 162 episodes of fungal peritonitis (4.5% of all peritonitis episodes) that occurred in 158 individuals. Candida albicans (25%) and other Candida species (44%) were the most common fungi isolated. Fungal peritonitis was independently predicted by indigenous race and prior treatment of bacterial peritonitis. Peritonitis episodes occurring after 7 and 60 days of treatment for previous bacterial peritonitis decreases in the probability of fungal peritonitis 23 and 6%, respectively. Compared with other organisms, fungal peritonitis was associated with significantly higher rates of hospitalization, catheter removal, transfer to permanent hemodialysis, and death. The risks of repeat fungal peritonitis and death were lowest with catheter removal combined with antifungal therapy when compared to either intervention alone. Our study shows that fungal peritonitis is a serious complication of peritoneal dialysis and should be strongly suspected in the context of recent antibiotic treatment for bacterial peritonitis.
- Published
- 2009
- Full Text
- View/download PDF
138. Corynebacterium peritonitis in Australian peritoneal dialysis patients: predictors, treatment and outcomes in 82 cases
- Author
-
Kym M. Bannister, K. J. Wiggins, Stephen P. McDonald, Fiona G. Brown, Johan B. Rosman, Katherine A. Barraclough, Carmel M. Hawley, and David W. Johnson
- Subjects
Male ,medicine.medical_specialty ,medicine.drug_class ,medicine.medical_treatment ,Antibiotics ,Peritonitis ,Peritoneal dialysis ,Internal medicine ,medicine ,Humans ,Aged ,Transplantation ,Corynebacterium Infections ,business.industry ,Australia ,Middle Aged ,medicine.disease ,Surgery ,Catheter ,Nephrology ,Vancomycin ,Female ,Hemodialysis ,business ,Peritoneal Dialysis ,Empiric therapy ,Kidney disease ,medicine.drug - Abstract
Background. Infection due to Corynebacterium species has been reported with increasing frequency over recent decades. The impacts of enhanced laboratory detection together with widespread use of new peritoneal dialysis (PD) connection technology and antimicrobial prophylaxis strategies on Corynebacterium PD-associated peritonitis have not been well studied. Methods. We investigated the frequency, predictors, treatment and clinical outcomes of Corynebacterium peritonitis in all Australian adult patients involving 66 centres who were receiving PD between 1 October 2003 and 31 December 2006. Results. Eighty-two episodes of Corynebacterium peritonitis (2.3% of all peritonitis episodes) occurred in 65 (1.4%) PD patients. Ten (15%) patients experienced more than one episode of Corynebacterium peritonitis and additional organisms were isolated in 12 (15%) episodes of Corynebacterium peritonitis. The incidence of Corynebacterium peritonitis was significantly and independently predicted only by BMI: RR 2.72 (95% CI 1.38–5.36) for the highest tertile BMI compared with the lowest tertile. The overall cure rate with antibiotics alone was 67%, which was similar to that of peritonitis due to other organisms. Vancomycin was the most common antimicrobial agent administered in the initial empiric and subsequent antibiotic regimens, although outcomes were similar regardless of antimicrobial schedule. Corynebacterium peritonitis not infrequently resulted in relapse (18%), repeat peritonitis (15%), hospitalization (70%), catheter removal (21%), permanent haemodialysis transfer (15%) and death (2%). The individuals who had their catheters removed more than 1 week after the onset of Corynebacterium peritonitis had a significantly higher risk of permanent haemodialysis transfer than those who had their catheters removed within 1 week (90% versus 43%, P < 0.05). Conclusions. Corynebacterium is an uncommon but significant cause of PD-associated peritonitis. Complete cure with antibiotics alone is possible in the majority of patients, and rates of adverse outcomes are comparable to those seen with peritonitis due to other organisms. Use of vancomycin rather than cephazolin as empiric therapy does not impact outcomes, and a 2-week course of antibiotic therapy appears sufficient. If catheter removal is required, outcomes are improved by removing the catheter within 1 week of peritonitis onset.
- Published
- 2009
- Full Text
- View/download PDF
139. Intradermal Versus Intramuscular Hepatitis B Vaccination in Hemodialysis Patients: A Prospective Open-Label Randomized Controlled Trial in Nonresponders to Primary Vaccination
- Author
-
Carolyn van Eps, Michael Whitby, David W. Mudge, Sally Carpenter, Kathryn J. Wiggins, E. Geoffrey Playford, David W. Johnson, Katherine A. Barraclough, and Carmel M. Hawley
- Subjects
Adult ,Male ,medicine.medical_specialty ,Injections, Intradermal ,Population ,Kaplan-Meier Estimate ,Antibodies, Viral ,medicine.disease_cause ,Injections, Intramuscular ,Renal Dialysis ,Internal medicine ,medicine ,Humans ,Hepatitis B Vaccines ,Prospective Studies ,Seroconversion ,education ,Aged ,Hepatitis B virus ,education.field_of_study ,business.industry ,Antibody titer ,Middle Aged ,Hepatitis B ,Vaccination ,Titer ,Treatment Outcome ,Tolerability ,Nephrology ,Chronic Disease ,Immunology ,Female ,Kidney Diseases ,Intramuscular injection ,business - Abstract
Background Primary hepatitis B virus (HBV) vaccination through the intramuscular (IM) route is less efficacious in dialysis patients than in the general population. Previous studies suggest improved seroconversion with intradermal (ID) vaccination. Study Design Prospective open-label randomized controlled trial. Setting & Participants Hemodialysis patients nonresponsive to primary HBV vaccination. Intervention Revaccination with either ID (5 μg of vaccine every week for 8 weeks) or IM (40 μg of vaccine at weeks 1 and 8) HBV vaccine. Outcomes Primary outcome: proportion of patients achieving HBV surface antibody (anti-HBs) titer of 10 IU/L or greater within 2 months of vaccination course. Secondary outcomes: time to seroconversion, predictors of seroconversion, peak antibody titer, duration of seroprotection, and safety and tolerability of vaccine. Measurements Anti-HBs titer to 24 months. Results 59 patients were analyzed. Seroconversion rates were 79% ID versus 40% IM (P = 0.002). The unadjusted odds ratio for seroconversion for ID versus IM was 5.5 (95% confidence interval [CI], 1.6 to 18.4) and increased with adjustment for baseline differences. The only factor predictive of seroconversion was the ID vaccination route. The geometric mean peak antibody titer was significantly greater in the ID versus IM group: 239 IU/L (95% CI, 131 to 434) versus 78 IU/L (95% CI, 36 to 168; P Limitations Inability to distinguish whether the mechanism of the greater efficacy of ID vaccination was the cumulative effect of multiple injections or route of administration; use of anti-HBs as a surrogate marker of protection; lack of evidence of long-term protection. Conclusions Significantly greater seroconversion rates and peak antibody titers can be achieved with ID compared with IM vaccination in hemodialysis patients nonresponsive to primary vaccination. ID vaccination should become the standard of care in this setting.
- Published
- 2009
- Full Text
- View/download PDF
140. Associations of Dialysis Modality and Infectious Mortality in Incident Dialysis Patients in Australia and New Zealand
- Author
-
Stephen P. McDonald, Kathryn J. Wiggins, Fiona G. Brown, David W. Johnson, Johan B. Rosman, Kym M. Bannister, Hannah Dent, and Carmel M. Hawley
- Subjects
Male ,medicine.medical_specialty ,medicine.medical_treatment ,Peritonitis ,Rate ratio ,Peritoneal dialysis ,Renal Dialysis ,Risk Factors ,Internal medicine ,medicine ,Humans ,Intensive care medicine ,Dialysis ,Aged ,business.industry ,Proportional hazards model ,Incidence ,Continuous ambulatory peritoneal dialysis ,Australia ,Bacterial Infections ,Middle Aged ,medicine.disease ,Mycoses ,Nephrology ,Female ,Hemodialysis ,business ,Peritoneal Dialysis ,New Zealand ,Kidney disease ,Cohort study - Abstract
The aim of the present investigation is to compare rates, types, causes, and timing of infectious death in incident peritoneal dialysis (PD) and hemodialysis (HD) patients in Australia and New Zealand.Observational cohort study using the Australian and New Zealand Dialysis and Transplant Registry data.The study included all patients starting dialysis therapy between April 1, 1995, and December 31, 2005.Dialysis modality.Rates of and time to infectious death were compared by using Poisson regression, Kaplan-Meier, and competing risks multivariate Cox proportional hazards model analyses.21,935 patients started dialysis therapy (first treatment PD, n = 6,020; HD, n = 15,915) during the study period, and 1,163 patients (5.1%) died of infectious causes (PD, 529 patients; 7.6% versus HD, 634 patients; 4.2%). Incidence rates of infectious mortality in PD and HD patients were 2.8 and 1.7/100 patient-years, respectively (incidence rate ratio PD versus HD, 1.66; 95% confidence interval [CI], 1.47 to 1.86). After performing competing risks multivariate Cox analyses allowing for an interaction between time on study and modality because of identified nonproportionality of hazards, PD consistently was associated with increased hazard of death from infection compared with HD after 6 months of treatment (6 months hazard ratio [HR], 1.08; 95% CI, 0.76 to 1.54; 6 months to 2 years HR, 1.31; 95% CI, 1.09 to 1.59; 2 to 6 years HR, 1.51; 95% CI, 1.26 to 1.80;6 years HR, 2.76; 95% CI, 1.76 to 4.33). This increased risk of infectious death in PD patients was largely accounted for by an increased risk of death caused by bacterial or fungal peritonitis.Patients were not randomly assigned to their initial dialysis modality. Residual confounding and coding bias could not be excluded.Dialysis modality selection significantly influences risks, types, causes, and timing of fatal infections experienced by patients with end-stage kidney disease in Australia and New Zealand.
- Published
- 2009
- Full Text
- View/download PDF
141. BK virus RNA can be detected in archival renal transplant biopsies using the reverse trancription polymerase chain reaction
- Author
-
Darren J. Kelly, David Goodman, Alison Skene, Robyn G Langham, Renae M. Gow, John Kanellis, Kathryn J. Wiggins, and Prue Hill
- Subjects
Adult ,Male ,Pathology ,medicine.medical_specialty ,Tissue Fixation ,Tumor Virus Infections ,Biopsy ,medicine.disease_cause ,Virus ,law.invention ,law ,Gene expression ,Humans ,Medicine ,Polymerase chain reaction ,DNA Primers ,Polyomavirus Infections ,Transplantation ,Base Sequence ,Reverse Transcriptase Polymerase Chain Reaction ,business.industry ,RNA ,Middle Aged ,Kidney Transplantation ,Molecular biology ,BK virus ,Nephrology ,BK Virus ,RNA, Viral ,Female ,business - Published
- 2008
- Full Text
- View/download PDF
142. Taking Relationship Seriously in Psychotherapy: Radical Relationality
- Author
-
Brent D. Slife and Bradford J. Wiggins
- Subjects
Therapeutic relationship ,Psychiatry and Mental health ,Clinical Psychology ,Psychotherapist ,Mainstream psychology ,Psychology ,Practical implications - Abstract
Psychologists who have historically focused on relationships have tended to underestimate the radical nature of human relationship. A “serious” or an ontological relationality would change the nature of psychotherapy. We describe this change in a discussion of two approaches to relationship, weak and strong relationality. We argue that weak relationality, the general conception of relationship in mainstream psychology, does not ultimately take even the therapeutic relationship seriously. We then discuss and illustrate ten practical implications that a strong relationality would have for psychotherapy.
- Published
- 2008
- Full Text
- View/download PDF
143. Diversity of Darkling Beetles (Coleoptera: Tenebrionidae) from Arnold Air Force Base in the Barrens of the Eastern Highland Rim, Tennessee
- Author
-
Paris L. Lambdin, Jerome F. Grant, and Gregory J. Wiggins
- Subjects
Canopy ,geography ,geography.geographical_feature_category ,Ecology ,biology ,Rare species ,Species diversity ,Plant community ,biology.organism_classification ,Grassland ,Habitat ,Arthropod ,Nature and Landscape Conservation ,Global biodiversity - Abstract
The Barrens of the Eastern Highland Rim in south-central Tennessee is a unique area and home to several rare species and plant communities. An arthropod diversity study conducted on Arnold Air Force Base sampled 11 sites that exemplify habitats found within the Barrens. This diversity study documented adults of 37 species of Tenebrionidae (darkling beetles) representing 24 genera; 14 of the 37 species collected are new Tennessee state records. The greatest number of species was collected from Sinking Pond (n = 16), Goose Pond (n = 14), and the Pine site (n = 11), which were all forested sites. No adult darkling beetles were collected in four (Grassland sites 1, 2, and 3 and Maidencane site) of the 11 sites sampled; these four sites are all open and lack a forest component. Of five collection methods that captured tenebrionids, canopy fogging collected the greatest number of species (n = 14), followed by light trapping (n = 13), and under-bark sampling (n = 13). About 50% (n = 84) of all tenebrion...
- Published
- 2007
- Full Text
- View/download PDF
144. Multimode RF sensor for moisture analysis of a high pressure gasket material
- Author
-
Reinhold Ludwig, J. Wiggins, Kenneth E. Bertagnolli, and Gene Bogdanov
- Subjects
aviation ,Materials science ,Multi-mode optical fiber ,Moisture analysis ,Moisture ,Gasket ,Composite material ,Seal (mechanical) ,Polycrystalline diamond ,Water content ,Explosive Decompression ,aviation.accident_type - Abstract
We have previously reported on a nondestructive moisture analysis technique for gaskets that seal a high-pressure cell in the production of polycrystalline diamond. Moisture content plays a crucial role in the performance of these gaskets. Gasket failure may cause explosive decompression that can damage the press anvils; therefore, testing of gaskets for moisture is desired. Radiofrequency measurements were successfully correlated to moisture content, but were disproportionately sensitive to moisture absorbed from the air relative to that remaining from the drying process. In this paper we attempt to spatially differentiate these two moisture types using a new multimode cavity sensor.
- Published
- 2015
- Full Text
- View/download PDF
145. Development of microsatellite loci in Pityophthorus juglandis, a vector of thousand cankers disease in Juglans spp
- Author
-
Phillip A. Wadl, William E. Klingeman, Denita Hadziabdic, Margaret Staton, Gregory J. Wiggins, Massimo Faccoli, Jerome F. Grant, Jay W. Pscheidt, Paris L. Lambdin, Robert N. Trigiano, Paul Merten, John K. Moulton, and Mark T. Windham
- Subjects
Juglans cinerea ,Population ,Juglans ,Biology ,Juglans nigra ,Genetic diversity ,food ,Thousand cankers disease ,Pityophthorus juglandis ,Walnut twig beetle ,Botany ,Genetics ,medicine ,education ,Ecology, Evolution, Behavior and Systematics ,education.field_of_study ,Pityophthorus ,Coleoptera ,Microsatellite loci ,biology.organism_classification ,medicine.disease ,food.food ,Genetic structure ,Microsatellite - Abstract
Using next-generation sequencing, 18 microsatellite loci were developed and characterized for walnut twig beetle, Pityophthorus juglandis, a vector of thousand cankers disease (TCD) affecting Juglans spp. Although all Juglans species are susceptible to TCD infection, native populations of J. nigra and J. cinerea, which is endangered in Canada, are most susceptible and threatened by habitat loss. Novel primers amplified di-, tri-, and tetra nucleotide repeats and detected 4–14 alleles per locus. Averaged observed and expected heterozygosity was 0.22 and 0.67, respectively. Our results indicate that P. juglandis microsatellite loci can be used to investigate genetic diversity and population structure of this vector across a widespread geography. These markers will be useful tools for evaluating genetic structure of P. juglandis population outbreaks and developing appropriate conservation strategies. Microsatellite loci obtained in this study can also be utilized to determine relationships of P. juglandis to other closely related Pityophthorus spp.
- Published
- 2015
146. Strategies for improving the detection of fMRI activation in trigeminal pathways with cardiac gating
- Author
-
Kenneth K. Kwong, A. Gregory Sorensen, Caterina Mainero, Christopher J. Wiggins, Wei-Ting Zhang, Divya S. Bolar, Ashok J. Kumar, Thomas Benner, and Patrick L. Purdon
- Subjects
Adult ,Male ,Cognitive Neuroscience ,Models, Neurological ,Thalamus ,Trigeminal Nuclei ,Physical Stimulation ,Pons ,medicine ,Humans ,Trigeminal system ,Cardiac cycle ,medicine.diagnostic_test ,Heart ,Human brain ,Magnetic Resonance Imaging ,medicine.anatomical_structure ,Neurology ,Touch ,Cardiac gating ,Female ,Brainstem ,Functional magnetic resonance imaging ,Psychology ,Neuroscience ,Algorithms - Abstract
Functional magnetic resonance imaging (fMRI) has become a powerful tool for studying the normal and diseased human brain. The application of fMRI in detecting neuronal signals in the trigeminal system, however, has been hindered by low detection sensitivity due to activation artifacts caused by cardiac pulse-induced brain and brainstem movement. A variety of cardiac gating techniques have been proposed to overcome this issue, typically by phase locking the sampling to a particular time point during each cardiac cycle. We sought to compare different cardiac gating strategies for trigeminal system fMRI. In the present study, we used tactile stimuli to elicit brainstem and thalamus activation and compared the fMRI results obtained without cardiac gating and with three different cardiac gating strategies: single-echo with TR of 3 or 9 heartbeats (HBs) and dual-echo T2*-mapping EPI (TR = 2 HBs, TE = 21/55 ms). The dual-echo T2* mapping and the single-echo with TR of 2 and 3 HBs cardiac-gated fMRI techniques both increased detection rate of fMRI activation in brainstem. Activation in the brainstem and the thalamus was best detected by cardiac-gated dual-echo EPI.
- Published
- 2006
- Full Text
- View/download PDF
147. Intradialytic serum protein concentrations differ between nightly nocturnal and conventional haemodialysis
- Author
-
Kathryn J Wiggins, Janeane Boddington, Rosemary Simmonds, Christine A. Somerville, Richard Knight, and John W M Agar
- Subjects
Adult ,Male ,medicine.medical_specialty ,Time Factors ,Supine position ,Serum albumin ,Ultrafiltration ,Renal Dialysis ,Internal medicine ,medicine ,Intravascular volume status ,Humans ,Aged ,Volume of distribution ,Blood Specimen Collection ,biology ,business.industry ,Albumin ,Blood Proteins ,General Medicine ,Middle Aged ,Blood proteins ,Endocrinology ,Alanine transaminase ,Nephrology ,biology.protein ,Alkaline phosphatase ,Female ,business - Abstract
SUMMARY: Aim: Nocturnal haemodialysis (NHD) is a new haemodialysis (HD) modality that has been shown to have many benefits when compared with conventional haemodialysis (CHD). Previous results from our NHD programme have demonstrated a 7% fall in the postdialysis serum albumin concentration when compared with the pre-HD levels. A similar, physiological, 9% haemodilution of albumin is seen in normal individuals on assuming a supine posture. Method: In this observational study, the intradialytic change in the concentration of 11 serum proteins (total protein, albumin, alkaline phosphatase, gamma glutamyl transferase, alanine transaminase, amylase, transferrin, complement factors 3 and 4, free thyroxine and C-reactive protein (CRP)) was measured in 10 patients on NHD and in 10 age- and sex-matched controls on CHD. The ultrafiltration rate (UFR) was also recorded. Results: We demonstrated an intradialytic fall in the total protein (0.63%), albumin (2.40%), alkaline phosphatase (1.84%), amylase (8.82%), complement factor 3 (2.73%) and CRP (8.19%) in patients on NHD. This was of a lesser magnitude than that occurring in the pilot study but still approximated the physiological fall in serum proteins occurring with overnight recumbency in normal individuals. In contrast, all serum proteins measured rose during CHD, reflecting intravascular volume contraction and haemoconcentration. The UFR was significantly lower in NHD than CHD (234.52 ± 20.90 mL/h vs 435.38 ± 38.44 mL/h, P
- Published
- 2005
- Full Text
- View/download PDF
148. Randomized, Controlled Trial of Topical Exit-Site Application of Honey (Medihoney) versus Mupirocin for the Prevention of Catheter-Associated Infections in Hemodialysis Patients
- Author
-
Scott B. Campbell, Kirsty Armstrong, David W. Mudge, Kathryn J. Wiggins, Graeme R. Nimmo, Harry Gibbs, Nicole M. Isbel, Carolyn van Eps, Carmel M. Hawley, and David W. Johnson
- Subjects
Adult ,Male ,Catheterization, Central Venous ,medicine.medical_specialty ,medicine.medical_treatment ,Hemodialysis Catheter ,Bacteremia ,Mupirocin ,Disease-Free Survival ,Drug Costs ,chemistry.chemical_compound ,Renal Dialysis ,Risk Factors ,Internal medicine ,medicine ,Humans ,Aged ,Antibacterial agent ,business.industry ,Hazard ratio ,Honey ,General Medicine ,Middle Aged ,Bandages ,Anti-Bacterial Agents ,Surgery ,Catheter ,chemistry ,Nephrology ,Chemoprophylaxis ,Kidney Failure, Chronic ,Female ,Hemodialysis ,business ,Central venous catheter - Abstract
The clinical usefulness of hemodialysis catheters is limited by increased infectious morbidity and mortality. Topical antiseptic agents, such as mupirocin, are effective at reducing this risk but have been reported to select for antibiotic-resistant strains. The aim of the present study was to determine the efficacy and the safety of exit-site application of a standardized antibacterial honey versus mupirocin in preventing catheter-associated infections. A randomized, controlled trial was performed comparing the effect of thrice-weekly exit-site application of Medihoney versus mupirocin on infection rates in patients who were receiving hemodialysis via tunneled, cuffed central venous catheters. A total of 101 patients were enrolled. The incidences of catheter-associated bacteremias in honey-treated (n = 51) and mupirocin-treated (n = 50) patients were comparable (0.97 versus 0.85 episodes per 1000 catheter-days, respectively; NS). On Cox proportional hazards model analysis, the use of honey was not significantly associated with bacteremia-free survival (unadjusted hazard ratio, 0.94; 95% confidence interval, 0.27 to 3.24; P = 0.92). No exit-site infections occurred. During the study period, 2% of staphylococcal isolates within the hospital were mupirocin resistant. Thrice-weekly application of standardized antibacterial honey to hemodialysis catheter exit sites was safe, cheap, and effective and resulted in a comparable rate of catheter-associated infection to that obtained with mupirocin (although the study was not adequately powered to assess therapeutic equivalence). The effectiveness of honey against antibiotic-resistant microorganisms and its low likelihood of selecting for further resistant strains suggest that this agent may represent a satisfactory alternative means of chemoprophylaxis in patients with central venous catheters.
- Published
- 2005
- Full Text
- View/download PDF
149. Surface modification of poly(ether urethane urea) with modified dehydroepiandrosterone for improvedin vivo biostability
- Author
-
Michael J. Wiggins, Anne Hiltner, Elizabeth M. Christenson, and James M. Anderson
- Subjects
Materials science ,Polyurethanes ,Biomedical Engineering ,Biocompatible Materials ,Ether ,Rats, Sprague-Dawley ,Biomaterials ,chemistry.chemical_compound ,Spectroscopy, Fourier Transform Infrared ,Polymer chemistry ,Animals ,Surface layer ,Polyurethane ,chemistry.chemical_classification ,Aqueous solution ,Molecular Structure ,Metals and Alloys ,Dehydroepiandrosterone ,Polymer ,Rats ,Surface coating ,Biodegradation, Environmental ,chemistry ,Microscopy, Electron, Scanning ,Ceramics and Composites ,Urea ,Surface modification ,hormones, hormone substitutes, and hormone antagonists ,Nuclear chemistry - Abstract
In this study, a fatty acid urethane derivative of dehydroepiandrosterone (DHEA) was synthesized and evaluated as a polyurethane additive to increase long-term biostability. The modification was hypothesized to reduce the water solubility of the DHEA and physically anchor the additive in the polyurethane during implantation. Polyurethane film weight loss in water as a function of time was studied to determine the polymer retention of the modified DHEA. The polyurethane film with unmodified DHEA had significant weight loss in the first day (10%) that was previously correlated to rapid leaching of the additive. The polyurethane film with modified DHEA had significantly less weight loss at all time points indicating improved polymer retention. The effect of the modified DHEA additive on the biostability of a poly(ether urethane urea) was examined after 5 weeks of subcutaneous implantation in Sprague-Dawley rats. Optical micrographs and infrared analysis of the specimens indicated that the modified DHEA bloomed to the surface of the film forming a crystalline surface layer approximately 10-15 microns thick. After explantation, this surface layer was intact without measurable differences in surface chemistry as monitored by attenuated total reflectance-Fourier transform infrared spectroscopy. There was no evidence of degradation of the polyurethane underneath the modified DHEA surface layer as compared with the polyurethane control. We have concluded that the modified DHEA self-assembled into a protective surface coating that inhibited degradation of the polyurethane. The roughness of the modified DHEA surface layer prevented adherent cell analysis to determine if the additive retained the ability to down-regulate macrophage activity. Subsequent studies will investigate the ability of surface-modifying additives to modulate cellular respiratory bursts in addition to the formation of an impermeable barrier. This bimodal approach to improving biostability holds great promise in the field of polyurethane biomaterials.
- Published
- 2005
- Full Text
- View/download PDF
150. Avoiding an EST Monopoly: Toward a Pluralism of Philosophies and Methods
- Author
-
Brent D. Slife, Bradford J. Wiggins, and Jason T. Graham
- Subjects
Psychiatry and Mental health ,Clinical Psychology ,Psychotherapist ,Empirical research ,media_common.quotation_subject ,Pluralism (philosophy) ,Ideology ,Sociology ,Monopoly ,Relativism ,media_common - Abstract
We contend in this article that the EST movement is becoming an ideological and economic monopoly through the exclusive use of one philosophy of science—empiricism. This epistemology monopolizes the methods that produce the EST’s. We provide lists of the values and assumptions that other scholars have demonstrated is endemic to empirical research, and we provide here an in-depth discussion about one central, uninvestigated value of such research. We, then, show the impact of this value—bias and favoritism—not only on the research itself but also on what is deemed an EST. This is followed by a discussion of a non-monopolistic alternative, an alternative that disallows the relativism and “anything goes” of psychotherapy’s history but avoids the dogmatism of an exclusive ideology.
- Published
- 2005
- Full Text
- View/download PDF
Catalog
Discovery Service for Jio Institute Digital Library
For full access to our library's resources, please sign in.