34 results on '"B. Valentin"'
Search Results
2. Evaluation of secondary metabolites from mangrove associated fungi Meyerozyma guilliermondii
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Elsa Lycias Joel and B. Valentin Bhimba
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Medicine - Abstract
Background: Mangrove associated fungi are the second most diverse organisms that remain less explored. Cytotoxic and antibacterial activities of foliar fungus Meyerozyma guilliermondii were investigated. Methods: Foliar fungus was isolated from the leaves of Rhizophora mucronata collected from Pichavaram mangrove forest, Tamilnadu. Extracts from liquid state culture were tested for cytotoxicity against two cancer cell lines using the MTT assay. Antibacterial activity was determined using the well diffusion method. The DNA was isolated from the fungi, and the ITS region of 5.8s RNA was sequenced. The spectral properties (GC/MS) of the purified compounds were determined. Results: The ethyl acetate extracts showed potent cytotoxicity against Hep2 and human breast adenocarcinoma (MCF-7) cell lines with IC50 values of 1.25 and 0.625 μg/ml, respectively. Antibacterial activity of the fungal extract was demonstrated against five test organisms. The fungus was found to be a new strain based on ITS sequence and database in NCBI Blast tool. Conclusion: Results indicate the potential for production of bioactive agents from mangrove foliar fungi. KEYWORDS: Marine fungi, Meyerozyma guilliermondii, Anticancer, Antibacterial
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- 2013
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3. In-pixel AI for lossy data compression at source for X-ray detectors
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B. Valentin, Manuel, Di Guglielmo, Giuseppe, Noonan, Danny, Dilip, Priyanka, Huang, Panpan, Quinn, Adam, Zimmerman, Thomas, Braga, Davide, Ogrenci, Seda, Jacobsen, Chris, Tran, Nhan, and Fahim, Farah
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- 2023
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4. Diagnostic performance of Glial Fibrillary Acidic Protein and Prehospital Stroke Scale for identification of stroke and stroke subtypes in an unselected patient cohort with symptom onset
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Henriette S. Jæger, Ditte Tranberg, Karianne Larsen, Jan B. Valentin, Rolf A. Blauenfeldt, Sebastian Luger, Kristi G. Bache, and Martin F. Gude
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Stroke ,Diagnosis ,GFAP ,PreSS ,Prehospital ,Medical emergencies. Critical care. Intensive care. First aid ,RC86-88.9 - Abstract
Abstract Introduction Rapid identification and treatment of stroke is crucial for the outcome of the patient. We aimed to determine the performance of glial fibrillary acidic protein (GFAP) independently and in combination with the Prehospital Stroke Score (PreSS) for identification and differentiation of acute stroke within 4.5 h after symptom onset. Patients and methods Clinical data and serum samples were collected from the Treat-Norwegian Acute Stroke Prehospital Project (Treat-NASPP). Patients with suspected stroke and symptoms lasting ≤ 4.5 h had blood samples collected and were evaluated with the National Institutes of Health Stroke Scale prospectively. In this sub study, NIHSS was retrospectively translated into PreSS and GFAP was measured using the sensitive single molecule array (SIMOA). Results A total of 299 patients with suspected stroke were recruited from Treat-NASPP and included in this study (44% acute ischemic stroke (AIS), 10% intracranial hemorrhage (ICrH), 7% transient ischemic attack (TIA), and 38% stroke mimics). ICrH was identified with a cross-fold validated area under the receiver-operating characteristic curve (AUC) of 0.73 (95% CI 0.62–0.84). A decision tree with PreSS and GFAP combined, first identified patients with a low probability of stroke. Subsequently, GFAP detected patients with ICrH with a 25.0% sensitivity (95% CI 11.5–43.4) and 100.0% specificity (95% CI 98.6–100.0). Lastly, patients with large-vessel occlusion (LVO) were detected with a 55.6% sensitivity (95% CI 35.3–74.5) and 82.4% specificity (95% CI 77.3–86.7). Conclusion In unselected patients with suspected stroke, GFAP alone identified ICrH. Combined in a decision tree, GFAP and PreSS identified subgroups with high proportions of stroke mimics, ICrH, LVO, and AIS (non-LVO strokes).
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- 2023
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5. An AI-based patient-specific clinical decision support system for OA patients choosing surgery or not: study protocol for a single-centre, parallel-group, non-inferiority randomised controlled trial
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Nanna Kastrup, Helene H. Bjerregaard, Mogens Laursen, Jan B. Valentin, Søren P. Johnsen, and Cathrine E. Jensen
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Artificial intelligence ,Machine learning ,Randomised controlled trial ,Cost-effectiveness ,Clinical decision support system ,Total hip replacement ,Medicine (General) ,R5-920 - Abstract
Abstract Background Osteoarthritis (OA) affects 20% of the adult Danish population, and the financial burden to society amounts to DKK 4.6 billion annually. Research suggests that up to 75% of surgical patients could have postponed an operation and managed with physical training. ERVIN.2 is an artificial intelligence (AI)-based clinical support system that addresses this problem by enhancing patient involvement in decisions concerning surgical knee and hip replacement. However, the clinical outcomes and cost-effectiveness of using such a system are scantily documented. Objective The primary objective is to investigate whether the usual care is non-inferior to ERVIN.2 supported care. The second objective is to determine if ERVIN.2 enhances clinical decision support and whether ERVIN.2 supported care is cost-effective. Methods This study used a single-centre, non-inferiority, randomised controlled in a two-arm parallel-group design. The study will be reported in compliance with CONSORT guidelines. The control group receives the usual care. As an add-on, the intervention group have access to baseline scores and predicted Oxford hip/knee scores and HRQoL for both the surgical and the non-surgical trajectory. A cost-utility analysis will be conducted alongside the trial using a hospital perspective, a 1-year time horizon and effects estimated using EQ-5D-3L. Results will be presented as cost per QALY gain. Discussion This study will bring knowledge about whether ERVIN.2 enhances clinical decision support, clinical effects, and cost-effectiveness of the AI system. The study design will not allow for the blinding of surgeons. Trial registration ClinicalTrials.gov NCT04332055 . Registered on 2 April 2020.
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- 2023
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6. An outreach collaborative model for early identification and treatment of mental disorder in Danish workplaces
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Helle Østermark Sørensen, Jan B. Valentin, Malene Krogsgaard Bording, Jens Ivar Larsen, Anelia Larsen, and Øyvind Omland
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Early identification ,Outreach collaborative model ,Depression ,Anxiety ,Workplace ,Unmet treatment need ,Psychiatry ,RC435-571 - Abstract
Abstract Background Depression and anxiety are prevalent mental disorders among the working population with potentially high personal and financial cost. The overall aim of this study was to test the applicability of an outreach collaborative model for early identification and treatment of clinical and sub-clinical mental disorders among Danish employees. This applicability was examined by I) investigating the fractions of identified and treated clinical and subclinical cases, II) describing the distribution and characteristics of cases identified and III) investigating the effect of allocated treatment. Methods A longitudinal study design with four assessments (T0-T3) over 16 months was applied. Self-reporting questionnaires probing for psychopathology were distributed to all employees in six consecutively enrolled companies at the four time points. Employees meeting the screening criteria at T1 were assessed diagnostically. Subjects diagnosed with a clinical mental disorder were allocated to outpatient psychiatric treatment, and subjects with subclinical conditions were allocated to preventive cognitive behavioural therapy. Follow-up was conducted 6 and 12 months after initiation of treatment. We used chi-squared test and F-test to compare the different groups on baseline characteristics and mixed effects linear regression to analyse the treatment effects. Results Forty (6.8%) of the 586 responders at T1 were diagnosed with a clinical mental disorder and referred to outpatient psychiatric treatment. Thirty-three (5.6%) were affected by a subclinical condition and referred to preventive treatment. Nearly two-thirds (63%) of the employees diagnosed with a clinical condition had never received treatment before. Symptom severity decreased significantly for both treated groups until follow-up. When compared to a composed control group, subclinical cases displayed a more rapid initial significant symptomatic decrease on the global symptom scale (coefs = − 0.914, 95% CI [− 1.754, − 0,075]) and anxiety sub-scale (coefs = − 1.043, 95% CI [− 2.021, − 0.066]). This did not apply to the clinical cases as no significant difference in change were identified. Conclusions The outreach collaborative model demonstrated an applicability to identify both clinical and subclinical cases, among these a high number of employees with an unmet need for treatment. We found evidence of a positive initial effect on symptomatology from the allocated preventive treatment among the subclinical cases, but not for clinical cases. Trial registration Retrospectively registered at December 18, 2018 at clinicaltrials.gov, identifier: NCT03786328.
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- 2019
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7. Silver nanoparticles: Antibacterial activity against wound isolates &invitro cytotoxic activity on Human Caucasian colon adenocarcinoma
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Devi, J. Saraniya and Bhimba, B. Valentin
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- 2012
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8. Anticancer and antimicrobial activity of mangrove derived fungi Hypocrea lixii VB1
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Bhimba, B. Valentin, Franco, D.A. Agnel Defora, Mathew, Jibi Merin, Jose, Geena Mary, Joel, Elsa Lycias, and Thangaraj, M.
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- 2012
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9. MRI-guided Active Surveillance without annual re-biopsy in patients with ISUP 1 and 2 prostate cancer – The prospective PROMM-AS Study
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J.P. Radtke, B. Valentin, C. Arsov, T. Ullrich, R. Al-Monajjed, M. Boschheidgen, M. Giessing, C. Lopez-Cotarelo, G. Antoch, P. Albers, and L. Schimmöller
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Urology - Published
- 2023
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10. Characterization of cytotoxic compound from mangrove derived fungi Irpex hydnoides VB4
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Bhimba, B Valentin, Franco, DA Agnel Defora, Jose, Geena Mary, Mathew, Jibi Merin, and Joel, Elsa Lycias
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- 2011
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11. Potenzial und Wirksamkeit eines telemedizinischen Rettungsassistenzsystems
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Rolf Rossaint, B. Valentin, Sebastian Bergrath, F. Hirsch, Stefan K. Beckers, J.C. Brokmann, Sabina Jeschke, and Michael Czaplik
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Telemedicine ,medicine.medical_specialty ,Remote Consultation ,Medical treatment ,business.industry ,Advisory committee ,MEDLINE ,General Medicine ,Anesthesiology and Pain Medicine ,Health care ,Emergency medicine ,Medicine ,Observational study ,Rural area ,business - Abstract
BACKGROUND The demographic change and an increasing multimorbidity of patients represent increasing challenges for the adequate prehospital treatment of emergency patients. The incorporation of supplementary telemedical concepts and systems can lead to an improved guideline-conform treatment. Beneficial evidence of telemedical procedures is only known for isolated disease patterns; however, no mobile telemedical concept exists which is suitable for use in the wide variety of different clinical situations. AIM This article presents a newly developed and evaluated total telemedical concept (TemRas) that encompasses organizational, medical and technical components. The use of intelligent and robust communication technology and the implementation of this add-on system allows the telemedical support of the rescue service for all emergencies. METHODS After development of the telemedical rescue assistance system, which includes organizational, medical and technical components, a telemedical centre and six ambulances in five different districts in North-Rhine Westphalia were equipped with this new tool. During the evaluation phase of 1 year in the routine emergency medical service the rate of complications as well as differences between urban and rural areas were analyzed with respect to different target parameters. RESULTS Between August 2012 and July 2013 a total of 401 teleconsultations were performed during emergency missions and 24 during secondary interhospital transfers. No complications due to teleconsultation were observed. The mean duration (±SD) of teleconsultations was longer in rural areas than in urban areas with 28.6±12.0 min vs. 25.5±11.1 min (p
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- 2015
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12. Telemedizin
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Michael Czaplik, Stefan K. Beckers, Rolf Rossaint, B. Valentin, F. Hirsch, Sebastian Bergrath, and J.C. Brokmann
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medicine.medical_specialty ,Emergency medical care ,Telemedicine ,business.industry ,Emergency medicine ,Emergency Medicine ,medicine ,Medical emergency ,Rural area ,business ,medicine.disease - Published
- 2014
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13. Anticancer and antimicrobial activity of mangrove derived fungi Hypocrea lixii VB1
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B. Valentin Bhimba, Jibi Merin Mathew, D.A. Agnel Defora Franco, M. Thangaraj, Geena Mary Jose, and Elsa Lycias Joel
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Hypocrea ,Antineoplastic Agents ,Species Specificity ,Cell Line, Tumor ,Neoplasms ,Drug Discovery ,Botany ,Living tree ,Endophytes ,Humans ,Base sequence ,DNA, Fungal ,Phylogeny ,Biological Products ,Base Sequence ,biology ,Rhizophora mucronata ,Rhizophoraceae ,General Medicine ,Antimicrobial ,biology.organism_classification ,Anti-Bacterial Agents ,Avicennia ,Complementary and alternative medicine ,MCF-7 Cells ,RNA, Satellite ,Mangrove ,Phytotherapy - Abstract
Mangrove is one of the oldest living tree species and its leaves are among the most extensively studied botanicals in use today. Scientific research throughout the world has found evidence to support the fact that its foliar extracts have great potential against human microbial pathogens. This study highlights the isolation of foliar fungi from Rhizophora mucronata, Avicenna officialis and Avicenna marina.It was isolated in Sabouroud's Dextrose Agar and mass cultivation was done in Sabouroud's Dextrose broth.The ethyl acetate extract showed maximum antibacterial activity which inturn checked for different concentration against bacterial pathogens and anticancer activity for Hep2 and MCF7 cell line in vitro. The DNA was isolated from the fungi and the ITS region of 5.8 s RNA was sequenced and assigned to new species as they are separated from the type strains phylogenetic neighbors by sequence similarities.This preliminary screening of fungal endophytes revealed their potential to yield potent bioactive compounds for drug discovery programmes.
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- 2012
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14. A Novel Transepidermal Water Loss Sensor
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Johann Nicolics, M. Mundlein, R. Chabicovsky, and B. Valentin
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Transepidermal water loss ,Chemistry ,Orders of magnitude (temperature) ,Electrode ,Analytical chemistry ,Calibration ,Conductance ,Humidity ,Electrical and Electronic Engineering ,Instrumentation ,Sensitivity (electronics) ,Signal ,Biomedical engineering - Abstract
Recently, a novel microsensor to measure the transepidermal water loss (TEWL) of the human skin has been developed. The sensor is based on an interdigital electrode system covered with a highly hygroscopic salt film. It is mounted inside a closed chamber arrangement in a distance of about 1.4 mm away from the skin. In this paper, the authors present a new method to evaluate and calibrate the sensor device. Different TEWL values are imitated by a variable humidity source. Furthermore, the very high sensitivity of the TEWL sensor is demonstrated. The output signal represented by the conductance of the sensor varies over six orders of magnitude in the relevant TEWL range between 2 and 60 g/(m2middoth)
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- 2006
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15. Accident vasculaire cérébral ischémique du nouveau-né : quels facteurs biologiques de risque thrombotique rechercher et quelles conséquences en pratique ?
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T. Perez, Elie Saliba, J.-B. Valentin, and Y. Gruel
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030203 arthritis & rheumatology ,Pregnancy ,Pediatrics ,medicine.medical_specialty ,biology ,business.industry ,030204 cardiovascular system & hematology ,medicine.disease ,Thrombophilia ,Thrombosis ,03 medical and health sciences ,0302 clinical medicine ,Antiphospholipid syndrome ,Methylenetetrahydrofolate reductase ,Pediatrics, Perinatology and Child Health ,medicine ,Factor V Leiden ,biology.protein ,Family history ,business ,Stroke - Abstract
All biological risk factors that have been previously identified to increase the risk of thrombosis in adults, have also been studied in neonates with arterial Ischemic Stroke (NAIS), but most studies were retrospective and included relatively low numbers of affected children. We therefore could not suggest recommendations with a strong level of evidence and only expert proposals potentially useful for clinical practice will be presented in this text. Despite these limitations, the extensive analysis of published data supported that factor V Leiden (FVL) and increased levels of Lp(a) could be significant risk factors for NAIS. Importantly, these 2 risk factors cannot be considered as having provoked NAIS, and moreover, they do not influence the prognosis and the immediate treatment. However, since the FVL may have an impact for the prescription of a thromboprophylaxis when the neonate will become adult, to look for its presence in affected patients may be justified. For clinical practice, the following propositions can be applied: 1. Routine testing for thrombophilia (AT, PC PS deficiency, FV Leiden or FII20210A) or for detecting other biological risk factors such as antiphospholipid antibodies, high FVIII, homocystein or Lp(a) levels, MTHFR thermolabile variant, should not be considered in neonates with NAIS. 2. Testing for FV Leiden can be performed in case of documented family history of venous thromboembolic disease. 3. Testing neonates for the presence of antiphospholipid antibodies (APA) is mandatory in case of clinical events suggesting antiphospholipid syndrome in the mother (vascular thrombosis, and/or pregnancy morbidity). 4. Routine testing for thrombophilia is not proposed in both parents in case of early death of the neonate, apart from APA in the mother.
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- 2017
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16. Antibacterial activity and characterization of secondary metabolites isolated from mangrove plant Avicennia officinalis
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B. Valentin Bhimba, Elsa Lycias Joel, D Edaya Naveena, J. Meenupriya, Suman Kumar, and M. Thangaraj
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Medicine(all) ,Avicennia officinalis ,Chromatography ,biology ,Ethyl acetate ,Pathogenic bacteria ,General Medicine ,biology.organism_classification ,medicine.disease_cause ,Diethyl phthalate ,Antibacterial ,chemistry.chemical_compound ,Column chromatography ,Biochemistry ,chemistry ,Staphylococcus aureus ,Officinalis ,medicine ,GC-MS ,Mangrove ,Antibacterial activity - Abstract
Objective: To explore antibacterial activity and characterization of secondary metabolites isolated from mangrove plant Avicennia officinalis (A. officinalis). Methods: In the present study the leaf extracts of A. officinalis were examined for its antibacterial potential using five different solvents against some reference strains of human pathogenic bacteria for the crude extract. Maximum activity was observed for ethyl acetate and hence different concentrations like 15 μL, 25 μL, and 50 μL of ethyl extracts was checked for its antibacterial activity. Partial purification of crude extract was earned by column chromatography and fractions were analyzed using gas chromatography-mass spectrometry (GC-MS) to identify compounds. Results: The crude ethyl acetate extracts of A. officinalis showed remarkable antibacterial activity with zones of inhibition of 13 mm against Eschericia coli (E. coli) and 11 mm against Staphylococcus aureus (S. aureus). Fraction 13 (ethyl acetate: methanol= 8:2) as the most potent one against with the minimal inhibitory concentration of 30 mm against E. coli and 25 mm against S. aureus. The GC-MS resultsof active column fraction (F13) revealed that the active principals were a mixture of hydroxy-4 methoxybenzoic acid, diethyl phthalate, oleic acid. Conclusions: The leaf extracts with proven antibacterial effects can clearly be directed towards cancer treatment as to inhibiting cancer cell growth. The limited number of test organisms owes to a constraint of resource. So, the effect of strong bursts of leaf extracts on human pathogenic bacteria should further be tested on a wide range of test organisms.
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- 2010
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17. Isolation and characterization of secondary metabolites from the mangrove plant Rhizophora mucronata
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Elsa Lycias Joel and B. Valentin Bhimba
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Medicine(all) ,Chromatography ,Rhizophora mucronata ,Ethyl acetate ,General Medicine ,Fractionation ,Secondary metabolite ,Biology ,biology.organism_classification ,Phytol ,chemistry.chemical_compound ,Column chromatography ,chemistry ,Botany ,medicine ,Petroleum ether ,Antibacterial activity ,GC-MS ,medicine.drug - Abstract
Objective: To evaluate the antibacterial activity of foliar extracts of Rhizophora mucronata (R. mucronata) against pathogens belonging to human origin and to identify the compound hitherto unprecedented in nature by GC-MS analysis. Methods: Soxhlet extraction method was used to get the corresponding extracts of ethanol, petroleum ether, acetone, methanol and ethyl acetate. The antimicrobial activities of the organic solvent extracts on the various test organisms using agar well diffusion technique were carried out. Ethyl acetate extract exhibited promising antimicrobial activity and hence minimum inhibitory concentration (MIC) was performed for the same. Column chromatography was done for partial purification of crude extract and fractions were analyzed by GC-MS. Results: A column chromatographic fractionation of the extracts and further UV visible and CS-MS analysis suggested the active principle compound were a mixture of squalene (19.19%), n-Hexadecanoic acid (6.59%), phytol (4.74%), 2-cyclohexane-1-one, 4-hydroxy-3,5, (4.20%) and oleic acid (2.88%). Conclusions: The results are good enough to serve to transform the practice of research in this sub field across a range of different benefit streams that include drug development. By and large this type of structure analyses are most important as aids to more rational decision taking in safety models versus effectiveness. In general, structural data provide prima facie support for drug hypothesis.
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- 2010
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18. Off-line and on-line differential pulse anodic stripping voltammetric techniques for the determination of antimony(III) and antimony(V) in zinc plant electrolyte
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B. Valentin Pfund, Alan M. Bond, Steven Kratsis, and O. Michael G. Newman
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Chemistry ,Inorganic chemistry ,food and beverages ,chemistry.chemical_element ,Hydrochloric acid ,Electrolyte ,Zinc ,Electrochemistry ,Analytical Chemistry ,Anodic stripping voltammetry ,chemistry.chemical_compound ,Antimony ,Hanging mercury drop electrode ,Amalgam (chemistry) - Abstract
Antimony, in both its trivalent and pentavalent states may be detrimental to the electrochemical deposition of zinc. Ideally, therefore antimony should be monitored in both oxidation states throughout an electrolytic zinc plant. At hydrochloric acid concentrations ( > 4 M) both antimony(III) and (V) present in zinc plant electrolyte can be reduced at a hanging mercury drop electrode (HMDE) to form an antimony amalgam, Sb(Hg). Consequently a very sensitive analytical signal is obtained for the determination of total antimony by differential pulse anodic stripping voltammetry (DPASV) using a 1:1 mixture of plant electrolyte and concentrated hydrochloric acid. In contrast, at low acid concentrations (0.1 M) predominantly only antimony(III) can be reduced and therefore determined in zinc plant electrolyte by DPASV at a HMDE by use of a 1:1 mixture of plant electrolyte and 0.2 M hydrochloric acid. The antimony(V) concentration is calculated by the method of subtraction of antimony(III) from total antimony. Consequently, simple addition of high and low concentrations of hydrochloric acid to zinc plant electrolyte can be used to provide a suitable electrolyte for both off-line and on-line methods for determining the concentration of total antimony, antimony(III) and antimony(V). The method described in this article has been applied to a wide range of zinc electrolyte samples and an on-stream analyzer technique has been successfully used for several years at the Pasminco Metals-BHAS electrolytic zinc plant in Port Pirrie, Australia.
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- 1997
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19. Gender Differences in the Level of Antibodies to Measles Virus in Adults
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P. Mikhail Kostinov, I. Pavel Zhuravlev, N. Nikolay Filatov, M. Аristitsa Kostinova, B. Valentina Polishchuk, D. Anna Shmitko, V. Cyrill Mashilov, E. Anna Vlasenko, A. Alexey Ryzhov, and M. Аnton Kostinov
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measles ,measles immunity among men and women ,age characteristics of measles immunity ,Medicine - Abstract
Individuals without a protective antibody level are susceptible to measles infection. There are differences in the persistence of antibodies after vaccination and infection, while the impact of gender on this process has not been sufficiently studied. Measles Ig G antibodies were measured in 1742 employees of a large hospital facility—403 men and 1339 women aged from 25 to 67 years; 15% participants had antibody levels less than the protective threshold of ≥0.18 IU/mL. Significant differences were found in the age group 40–49, where the level of IgG antibodies to measles among men was higher than among women (1.51 IU/mL (0.41; 3.38) vs. 0.70 IU/mL (0.22;1.98) respectively, (U = 3.2, p = 0,001)); in the age group 60 and older, by contrast, the level of antibodies among women was higher compared to men (3.29 IU/mL (1.72; 4.07) vs. 2.90 IU/mL (1.46; 3.53) respectively (U = 2.2, p = 0.03)). The proportion of seronegative women in the age group 40–49 was significantly higher than of seronegative men: 22 [18–26]% and 11 [6–18]% respectively (χ2 = 7.0, p = 0.001). The revealed gender characteristics that affect persistence of measles immunity may be important in personalization of vaccinal prevention for men and women.
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- 2021
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20. Off-line and on-line differential pulse anodic stripping voltammetric techniques for the determination of antimony( III) and antimony( V) in zinc plant electrolyte.
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Bond, Alan M., Kratsis, Steven, Newman, O. Michael G., and Pfund, B. Valentin
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- 1997
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21. Simple voltammetric method for the determination of β-carotene in brine and soya oil samples at mercury and glassy carbon electrodes.
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Pfund, B. Valentin, Bond, Alan M., and Hughes, Terence C.
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- 1992
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22. The use of porous and surface modified silicas as drug delivery and stabilizing agents
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K. Unger, W. Kircher, B. Valentin, and H. Rupprecht
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Pharmacology ,Drug development ,Chemistry ,Organic Chemistry ,Drug Discovery ,Drug delivery ,Surface modified ,Pharmaceutical Science ,Nanotechnology ,Stabilizing Agents ,Porosity - Abstract
(1983). The use of porous and surface modified silicas as drug delivery and stabilizing agents. Drug Development and Industrial Pharmacy: Vol. 9, No. 1-2, pp. 69-91.
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- 1983
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23. Synthesis of Hydrophilic-Lypophilic Copolymers in Emulsion: Initiation of Vinyl Chloride by Aqueous Soluble Polymeric Radicals at the Interface
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A. Banderet, S. Guerrero, M. Lambla, and B. Valentin
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Aqueous solution ,Materials science ,Polyacrylamide ,technology, industry, and agriculture ,General Engineering ,Aqueous two-phase system ,Emulsion polymerization ,Micelle ,Vinyl polymer ,Vinyl chloride ,Polyvinyl chloride ,chemistry.chemical_compound ,chemistry ,Polymer chemistry - Abstract
The emulsion polymerization of vinyl chloride initiated by a redox pair in the presence of acrylamide in the aqueous phase gives a product which apparently corresponds to a block copolymer of polyacrylamide and polyvinyl chloride). A reaction scheme is proposed which involves the attack of the vinyl chloride in the micelles by a growing polyacrylamide radical, thus producing the hydrophilic - lypophilic copolymer. Isopropyl alcohol is used as a transfer agent to limit the size of the PAA chains growing in the aqueous phase. The reaction product was characterized by selective solvent extraction, elemental analysis, infrared spectroscopy, and differential thermal analysis.
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- 1977
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24. Neuere Anschauungen über die Knochen- und Gelenktuberkulose
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B. Valentin
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Gynecology ,medicine.medical_specialty ,Philosophy ,Drug Discovery ,medicine ,Molecular Medicine ,General Medicine ,Genetics (clinical) - Published
- 1937
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25. Die Korrelation (Koppelung) Von Missbildungen, Erläutert Am Beispiel Der Akrocephalosyndaktylie
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B. Valentin
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Gynecology ,medicine.medical_specialty ,business.industry ,medicine ,Orthopedics and Sports Medicine ,Surgery ,business - Abstract
(1938). Die Korrelation (Koppelung) Von Missbildungen, Erlautert Am Beispiel Der Akrocephalosyndaktylie. Acta Orthopaedica Scandinavica: Vol. 9, No. 4, pp. 235-316.
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- 1938
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26. Klinische Beiträge zum Wesen der Mißbildungen
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B. Valentin
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business.industry ,Medicine ,Orthopedics and Sports Medicine ,Surgery ,General Medicine ,business - Published
- 1930
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27. Landscape and challenges in economic evaluations of artificial intelligence in healthcare: a systematic review of methodology
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Nanna Kastrup, Annette W. Holst-Kristensen, and Jan B. Valentin
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Artificial intelligence ,Health economic evaluation ,Cost-effectiveness ,Cost-utility analysis ,Cost-effectiveness analysis ,Ssystematic review ,Computer applications to medicine. Medical informatics ,R858-859.7 - Abstract
Abstract Background The potential for artificial intelligence (AI) to transform healthcare cannot be ignored, and the development of AI technologies has increased significantly over the past decade. Furthermore, healthcare systems are under tremendous pressure, and efficient allocation of scarce healthcare resources is vital to ensure value for money. Health economic evaluations (HEEs) can be used to obtain information about cost-effectiveness. The literature acknowledges that the conduct of such evaluations differs between medical technologies (MedTechs) and pharmaceuticals, and poor quality evaluations can provide misleading results. This systematic review seeks to map the evidence on the general methodological quality of HEEs for AI technologies to identify potential areas which can be subject to quality improvements. We used the 35-item checklist by Drummond and Jefferson and four additional checklist domains proposed by Terricone et al. to assess the methodological quality of full HEEs of interventions that include AI. Results We identified 29 studies for analysis. The included studies had higher completion scores for items related to study design than for items related to data collection and analysis and interpretation of results. However, none of the studies addressed MedTech-specific items. Conclusions There was a concerningly low number of full HEEs relative to the number of AI publications, however the trend is that the number of studies per year is increasing. Mapping the evidence of the methodological quality of HEEs of AI shows a need to improve the quality in particular the use of proxy measures as outcome, reporting, and interpretation of the ICER.
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- 2024
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28. Cortisol and alpha-amylase as stress response indicators during pre-hospital emergency medicine training with repetitive high-fidelity simulation and scenarios with standardized patients
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B. Valentin, Marie-Therese Mennig, Oliver Grottke, Christina Fitzner, Harold Fischermann, Daniel Rörtgen, Michael Müller, Max Skorning, Rolf Rossaint, Sebastian Bergrath, Clemens Kirschbaum, and Stefan K. Beckers
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Adult ,Male ,medicine.medical_specialty ,Hydrocortisone ,Post-graduate medical education ,Allied Health Personnel ,Pilot Projects ,Review ,Salivary cortisol ,Manikins ,Critical Care and Intensive Care Medicine ,Salivary alpha-amylase ,Fight-or-flight response ,Germany ,Physicians ,medicine ,Emergency medical services ,Humans ,High-fidelity simulation ,ddc:610 ,Saliva ,Cortisol level ,business.industry ,Stress response ,Standardized patients ,Patient Simulation ,High fidelity simulation ,Emergency medicine ,Emergency Medicine ,Female ,alpha-Amylases ,business ,Emergency healthcare ,Stress, Psychological ,Pre-hospital emergency medicine ,medicine.drug - Abstract
Scandinavian journal of trauma, resuscitation and emergency medicine 23(1), 31 (2015). doi:10.1186/s13049-015-0110-6, Published by BioMed Central, London
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29. Patients with acute intracerebral hemorrhage and severe symptoms are highly sensitive to prehospital delay. A subgroup analysis from the RESIST and TRIAGE-STROKE trials
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Anne Behrndtz, Claus Z. Simonsen, Jan B. Valentin, Grethe Andersen, and Rolf A. Blauenfeldt
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stroke ,prehospital ,intracerebral hemorrhage ,delay ,triage ,Medicine - Abstract
BackgroundPatients with a positive prehospital stroke severity score and underlying intracerebral hemorrhage (ICH) may be harmed by longer onset-to-admission time. We aimed to investigate the interaction between ICH severity and time from onset to admission on functional outcome.MethodsThis is an individual patient data analysis with data from two randomized prehospital stroke trials using the same prehospital stroke scale. Patients were stratified according to the presence of a positive stroke severity score. They were grouped into early arrivers (admitted ≤ 90 min from onset) and late arrivers (admitted ≥90 min after onset). The primary outcome was a shift toward a better functional outcome on the modified Rankin Scale (mRS).ResultsA total of 212 patients had ICH. A positive stroke severity score was seen in 123 of these patients. Patients with ICH and a positive prehospital stroke severity score had a significantly worse outcome if they arrived 90 min or later at the hospital (adjusted odds ratio [aOR]: 2.02, 95% CI [1.01, 4.12]). This difference was not observed in patients without a positive severity score (aOR: 0.50, 95% CI [0.22, 1.14]). Patients with a positive score also had an increased risk of death or severe dependency (mRS of 5–6) of 9.1 percentage points (95% CI [−1.6%, 19.8%]) per hour if they were diagnosed with ICH.ConclusionLonger onset-to-admission time was harmful for patients with ICH and a positive prehospital stroke severity score.
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- 2024
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30. Standard Versus Individualized Blood Pressure Targets During Thrombectomy: A Randomized Controlled Pilot Trial
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Ulrick S. Espelund, Jan B. Valentin, Christian F. Eriksen, Klaus U. Koch, Søren P. Johnsen, Rolf A. Blauenfeldt, Lasse Speiser, Claus Z. Simonsen, and Mads Rasmussen
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anesthesia ,blood pressure ,ischemic stroke ,thrombectomy ,Neurology. Diseases of the nervous system ,RC346-429 ,Diseases of the circulatory (Cardiovascular) system ,RC666-701 - Abstract
Background The optimal blood pressure management strategy in patients undergoing endovascular therapy for acute ischemic stroke is unknown. This pilot study aimed to assess the feasibility of a standard versus individualized blood pressure management strategy during endovascular therapy. Methods This randomized controlled pilot trial included adult patients with acute ischemic stroke with large‐vessel occlusion in the anterior circulation undergoing endovascular therapy. Patients were randomized to either standard (mean arterial blood pressure [MABP] targeted between 70 and 90 mm Hg) or individualized (MABP targeted ±10% of a baseline value measured in the neurointerventional suite) blood pressure targets until reperfusion or removal of groin sheath. The main outcome was the modified Rankin Scale score at 90 days. Secondary outcomes included feasibility outcomes, 90‐day dichotomized modified Rankin Scale score (0–2 versus 3–6), and reperfusion rates. Results Between April 2021 and February 2022, 60 patients (median [interquartile range] age, 76 [66–84] years) were randomly assigned to standard (n=30) or individualized (n=30) blood pressure targets. Median (interquartile range) National institutes of Health Stroke Scale score was 15 (10–18). Mean (SD) MABP, mean (SD) systolic blood pressure, and median (interquartile range) cardiac output were significantly higher in the individualized group compared with the standard group (MABP: 94 [9] versus 88 [9] mm Hg; P=0.012; systolic blood pressure: 149 [21] versus 139 [17] mm Hg; P=0.032; and cardiac output: 5.82 [4.22–7.23] versus 4.35 [3.73–5.1] L/min; P=0.02). The odds ratio for improved outcome in the individualized group was 1.37 (95% CI, 0.56–3.36). The relative risk for improved dichotomized outcome in the individualized group was 1.31 (95% CI, 0.87–1.98). Full reperfusion rates were comparable between the standard and individualized groups (90% versus 93%; P=0.64). The median percentage of time outside the MABP targets was 54.3% in the standard group versus 61.4% in the individual group (P=0.30) and did not meet the feasibility target. Recruitment rate, data completeness, and safety were within feasibility limits. Conclusions The feasibility criteria were not met in this study because of difficulties in achieving the desired blood pressure targets. These findings do not support continuing with a large trial using the current protocol.
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- 2023
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31. The effect of music to improve sleep quality in depression related insomnia
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H. N. Lund, I. N. Pedersen, A. Heymann-Szlachcinska, M. Tuszewska, G. Bizik, J. I. Larsen, A. Drago, E. Kulhay, A. Larsen, H. Ø. Sørensen, B. Grønbech, L. R. Bertelsen, J. B. Valentin, J. Mainz, S. P. Johnsen, N. Hannibal, and R. MacDonald
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Psychiatry ,RC435-571 - Abstract
Introduction Insomnia in depression is common and difficult to resolve. Music is commonly used as a sleep aid, and clinical trials pointing to positive effects of music as a sleep aid are increasing adding to the evidence base. There is little knowledge on the effectiveness of music for depression related insomnia. Objectives A recent RCT study conducted in psychiatry at Aalborg University Hospital examined effects of a music intervention for insomnia in depression. The intervention group listened to music at bedtime for four weeks, controls were offered music intervention post-test. Primary outcome measure was Pittsburgh Sleep Quality Index (PSQI). Secondary outcomes included Actigraphy, The Hamilton depression Rating Scale (HAMD-17) and World Health Organisation well-being questionnaires (WHO-5, WHOQOL-BREF). Methods A two-armed randomized controlled trial (n=112) and a qualitative interview study (n=4) Results The RCT study showed signficant improvements for the music intervention group in sleep quality and quality of life at four weeks according to global PSQI scores (effect size= -2.1, 95%CI -3.3; -0.9) and WHO-5 scores (effect size 8.4, 95%CI 2.7; 14.0). Actigraphy measures showed no changes and changes in depression symptoms (HAMD-17) were not detected. The interview study unfolded examples of the influences of music on sleep and relaxation. Music distracted, affected mood and arousal positively and supported formation of sleep habits. Results from the trial are discussed and merged with findings from the interview study. The results from the trial suggested moderate effects of music listening for the population while findings from the interview study showed examples of individual and highly varying outcomes. Conclusions Music is suggested as a low-cost, side-effect free and safe intervention in supplement to existing treatments improving sleep in depression. Disclosure of Interest None Declared
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- 2023
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32. Endovascular Therapy of Tandem Occlusions: Baseline Characteristics and Outcomes Compared With Intracranial Occlusion
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Mads M. Sørensen, Thabele M. Leslie‐Mazwi, Jonas Jensen, Jan B. Valentin, and Claus Z. Simonsen
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acute ischemic stroke ,endovascular thrombectomy ,tandem occlusion ,Neurology. Diseases of the nervous system ,RC346-429 ,Diseases of the circulatory (Cardiovascular) system ,RC666-701 - Abstract
Background Endovascular therapy is highly effective in stroke caused by large vessel occlusion. Guidelines support treatment in case of occlusion of the intracranial internal carotid artery or the first segment of the middle cerebral artery. We aimed to examine baseline characteristics and outcome of patients who underwent endovascular therapy for tandem occlusions. Methods We conducted a retrospective study of patients who underwent endovascular therapy of tandem occlusion or occlusion of intracranial internal carotid artery/first segment of the middle cerebral artery between May 2015 and December 2019. Univariate comparisons of baseline characteristics and outcome (favorable functional outcome 90‐days after treatment and mortality) were performed. We used inverse‐probability‐of‐treatment‐weights to adjust for confounders. Results We compared 167 patients with tandem occlusion and 414 with intracranial occlusions. Patients with tandem occlusion were younger (69 years [interquartile range: 59.25–76] versus 74 [interquartile range: 64–81]; P = 0.0002), male (64.7% versus 51.4%; P = 0.004), more frequently active smokers (42.5% versus 25.6%; P = 0.0001), and less frequently subject to atrial fibrillation (18.6% versus 41.3%; P
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- 2023
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33. Inequalities in heart failure care in a tax‐financed universal healthcare system: a nationwide population‐based cohort study
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Inge Schjødt, Søren P. Johnsen, Anna Strömberg, Jan B. Valentin, and Brian B. Løgstrup
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Heart failure with reduced ejection fraction ,Inequalities ,Performance measures ,registry ,Social class ,Socioeconomic factors ,HFrEF ,Diseases of the circulatory (Cardiovascular) system ,RC666-701 - Abstract
Abstract Aims Data on socioeconomic‐related differences in heart failure (HF) care are sparse. Inequality in care may potentially contribute to a poor clinical outcome. We examined socioeconomic‐related differences in quality of HF care among patients with incident HF with reduced ejection fraction (EF) (HFrEF). Methods and results We conducted a nationwide population‐based cohort study among patients with HFrEF (EF ≤40%) registered from January 2008 to October 2015 in the Danish Heart Failure Registry, a nationwide registry of patients with a first‐time primary HF diagnosis. Associations between individual‐level socioeconomic factors (cohabitation status, education, and family income) and the quality of HF care defined by six guideline‐recommended process performance measures [New York Heart Association (NYHA) classification, treatment with angiotensin‐converting‐enzyme inhibitors (ACEI)/angiotensin receptor blockers (ARB), beta‐blockers and mineralocorticoid receptor antagonists, exercise training, and patient education] were assessed using multiple imputation and multivariable logistic regression controlling for potential confounders. Among 17 122 HFrEF patients included, 15 290 patients had data on all six process performance measures. Living alone was associated with lower odds of NYHA classification [adjusted OR (aOR) 0.81; 95% confidence interval (CI): 0.72–0.90], prescription of ACEI/ARB (aOR 0.76; 95% CI: 0.68–0.88) and beta‐blockers (aOR 0.84; 95% CI: 0.76–0.93), referral to exercise training (aOR 0.75; 95% CI: 0.69–0.81), and patient education (aOR 0.73; 95% CI: 0.67–0.80). Compared with high‐level education, low‐level education was associated with lower odds of NYHA classification (aOR 0.93; 95% CI: 0.79–1.11), treatment with ACEI/ARB (aOR 0.99; 95% CI: 0.81–1.20) and beta‐blockers (aOR 0.93; 95% CI: 0.79–1.09), referral to exercise training (aOR 0.73; 95% CI: 0.65–0.82), and patient education (aOR 0.86, 95% CI: 0.75–0.98). An income in the lowest tertile was associated with lower odds of NYHA classification (aOR 0.67; 95% CI: 0.58–0.79), prescription of ACEI/ARB (aOR 0.80, 95% CI: 0.67–0.95) and beta‐blockers (aOR 0.88, 95% CI: 0.86–1.01), referral to exercise training (aOR 0.59, 95% CI: 0.53–0.64), and patient education (aOR 0.66; 95% CI: 0.59–0.74) compared with an income in the highest tertile. Overall, no systematic differences were seen when the analyses were stratified by sex and age groups. Conclusions Living alone, low‐level education, and income in the lowest tertile were associated with reduced use of recommended processes of HF care among Danish HFrEF patients with a first‐time primary HF diagnosis. Efforts are warranted to ensure guideline‐recommended HF care to all HFrEF patients, irrespective of socioeconomic background.
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- 2020
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34. Internet-based CBT for social phobia and panic disorder in a specialised anxiety clinic in routine care: Results of a pilot randomised controlled trial
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Kim Mathiasen, Heleen Riper, Lars Holger Ehlers, Jan B. Valentin, and Nicole K. Rosenberg
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Internet ,Computer ,Internet-based ,Cognitive behavioural therapy ,CBT ,iCBT ,cCBT ,RCT ,Randomised controlled trial ,Anxiety ,Social phobia ,Panic disorder ,Specialised care ,Secondary care ,Self-help ,Information technology ,T58.5-58.64 ,Psychology ,BF1-990 - Abstract
Ample studies have demonstrated that internet-based cognitive behavioural therapy (iCBT) for anxiety disorders is effective and acceptable in controlled settings. Studies assessing the clinical effectiveness of iCBT for anxiety disorders among routine care populations are, however, not as numerous. The purpose of this study was to assess the effectiveness of iCBT among anxiety patients, who were on a waiting list for intensive outpatient treatment, in a specialised routine care clinic.1 Clinic for OCD and Anxiety disorders, Aarhus University Hospital, DK. A randomised controlled pilot trial was conducted. Recruited patients were on a waiting list and had a primary diagnosis of either social phobia or panic disorder. Participants were randomised into either receiving iCBT with minimal therapist contact (received access to the programme FearFighter® (FF) and received support from a clinician via telephone) or no treatment (stayed on the waiting list). The primary outcome was self-reported symptomatic change of anxiety on Beck Anxiety Inventory (BAI). The secondary outcomes were comorbid depression measured on Beck Depression Inventory (BDI-II) and quality of life measured with the EuroQol one-item visual-analogue scale (EQ-vas). All results were analysed by intention-to-treat analyses using a mixed-effects approach. N = 158 patients were assessed for eligibility of which N = 67 met all eligibility inclusion criteria, signed informed consent forms, and were randomised. Post-treatment assessment was completed by N = 47 (70%). In the intervention group, N = 11 (31%) completed all modules of FF. No significant differences of change of symptomatic levels were found between the intervention and control group for anxiety (BAI: mean diff. = 2.42; 95% CI −1.03 to 5.86; p = 0.17; d = 0.06) or for depression (BDI-II: mean diff. 1.87; 95% CI −2.25 to 6.00; p = 0.37; d = 0.02). A large and significant effect was found in self-reported quality of life in favour of the experimental group (EQ-vas: mean diff. −20.88; 95% CI −30.64 to −11.11; p
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- 2016
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