Research Topics
| Carl van WalravenSummaryAffiliation: Ottawa Health Research Institute Country: Canada Publications
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Publications
The Kaiser Permanente inpatient risk adjustment methodology was valid in an external patient populationCarl van Walraven
Ottawa Health Research Institute, A581 003 Carling Ave, Ottawa, Ontario K1Y 4E9, Canada
J Clin Epidemiol 63:798-803. 2010..This study assessed the Kaiser Permanente inpatient risk adjustment methodology for hospital mortality in a patient population distinct from that used for its derivation...
Effect of discharge summary availability during post-discharge visits on hospital readmissionCarl van Walraven
Department of Medicine, University of Ottawa, Clinical Epidemiology Unit, Ottawa Health Research Institute, Ottawa, ON, Canada
J Gen Intern Med 17:186-92. 2002..To determine if the delivery of hospital discharge summaries to follow-up physicians decreases the risk of hospital readmission...- The Procedural Index for Mortality Risk (PIMR): an index calculated using administrative data to quantify the independent influence of procedures on risk of hospital deathCarl van Walraven
Clinical Epidemiology Program, Ottawa Hospital Research Institute, 1053 Carling Avenue, Ottawa, K1Y 4E9, Canada
BMC Health Serv Res 11:258. 2011..This study derived and internally validated an index that can be calculated using administrative data to quantify the independent risk of hospital death after a procedure... - The influence of incidental abdominal aortic aneurysm monitoring on patient outcomesCarl van Walraven
Faculty of Medicine, University of Ottawa, Ottawa, Ontario, Canada
J Vasc Surg 54:1290-1297.e2. 2011..These are common, and many undergo incomplete radiological monitoring. The association between monitoring completeness and population-based outcomes has not been studied... - Incidence, follow-up, and outcomes of incidental abdominal aortic aneurysmsCarl van Walraven
Faculty of Medicine, University of Ottawa, Ontario, Canada
J Vasc Surg 52:282-9.e1-2. 2010..Incidental AAAs are important findings because they require monitoring and surgical treatment, when indicated, to prevent rupture. The prevalence of incidental AAAs and their management has not been extensively studied... - The independent association of provider and information continuity on outcomes after hospital discharge: implications for hospitalistsCarl van Walraven
Ottawa Hospital Research Institute, Ottawa, Ontario, Canada
J Hosp Med 5:398-405. 2010..To determine how this influenced patient outcomes, we examined the independent association of several physician continuity and information continuity measures on death or urgent readmission after discharge from hospital... - Radiographic monitoring of incidental abdominal aortic aneurysms: a retrospective population-based cohort studyCarl van Walraven
University of Ottawa, Canada
Open Med 5:e67-76. 2011..No population-based studies have assessed the management of incidental AAAs. The objective of this study was to measure the completeness of radiographic monitoring of incidental AAAs by means of a population-based analysis... - Continuity of care and patient outcomes after hospital dischargeCarl van Walraven
Faculty of Medicine, University of Ottawa, Ottawa, Ontario, Canada
J Gen Intern Med 19:624-31. 2004..Transfer of information between physicians can be poor. We determined whether early postdischarge outcomes changed when patients were seen after discharge by physicians who treated them in the hospital... - A prospective cohort study found that provider and information continuity was low after patient discharge from hospitalCarl van Walraven
Ottawa Hospital Research Institute, Ottawa, Ontario, Canada
J Clin Epidemiol 63:1000-10. 2010..This study is a detailed examination of continuity of care in patients discharged from hospital that simultaneously measured separate components of continuity over time or determined the factors with which they are associated... 
Burden of potentially avoidable anticoagulant-associated hemorrhagic and thromboembolic events in the elderlyCarl van Walraven
Clinical Epidemiology Program, Ottawa Health Research Institute, Ottawa Hospital, Civic Campus, 1053 Carling Avenue, Ottawa, Ontario, Canada
Chest 131:1508-15. 2007..However, not all anticoagulation-associated events are attributable to poor anticoagulation control, nor do all hemorrhagic or thromboembolic events occur in anticoagulated patients...- Adverse events following an emergency department visitAlan J Forster
Ottawa Health Research Institute Clinical Epidemiology Program, Ottawa, Ontario, Canada
Qual Saf Health Care 16:17-22. 2007..Many studies demonstrate a high rate of treatment-related adverse outcomes or adverse events. No studies have prospectively evaluated adverse events in patients discharged home from the emergency department (ED)... - Effect of age on stroke prevention therapy in patients with atrial fibrillation: the atrial fibrillation investigatorsCarl van Walraven
University of Ottawa and Ottawa Health Research Institute Canada, Ottawa, Canada
Stroke 40:1410-6. 2009.... - Effect of a nurse team coordinator on outcomes for hospitalized medicine patientsAlan J Forster
Department of Medicine, University of Ottawa, Ottawa, Ontario, Canada
Am J Med 118:1148-53. 2005..We do not know if adding a clinical nurse specialist (CNS) to physician teams in hospitals that already have discharge planning services makes a difference... - Derivation and validation of an index to predict early death or unplanned readmission after discharge from hospital to the communityCarl van Walraven
Clinical Epidemiology Program, Ottawa Hospital Research Institute, Ottawa Hospital, and the Department of Emergency Medicine, University of Ottawa, Ottawa, Ontario
CMAJ 182:551-7. 2010..We sought to derive and validate an index to predict the risk of death or unplanned readmission within 30 days after discharge from hospital to the community... - Oral anticoagulants vs. aspirin for stroke prevention in patients with non-valvular atrial fibrillation: the verdict is inCarl van Walraven
Clinical Epidemiology Unit Ottawa Health Research Institute, Ottawa, Ontario, Canada
Card Electrophysiol Rev 7:374-8. 2003..Since high-risk AF patients appear to benefit most from OAC, determining stroke risk in AF patients is very important... - Effect of an interactive voice response system on oral anticoagulant managementNatalie Oake
Clinical Epidemiology Program, Ottawa Health Research Institute, The Ottawa Hospital, Ottawa, ON K1Y 4E9
CMAJ 180:927-33. 2009..Monitoring oral anticoagulants is logistically challenging for both patients and medical staff. We evaluated the effect of adding an interactive voice response system to computerized decision support for oral anticoagulant management... - Anticoagulation intensity and outcomes among patients prescribed oral anticoagulant therapy: a systematic review and meta-analysisNatalie Oake
Department of Medicine, University of Ottawa, and the Clinical Epidemiology Program, Ottawa Health Research Institute, Ottawa, Ont
CMAJ 179:235-44. 2008..We sought to determine the association between anticoagulation intensity and the risk of hemorrhagic and thromboembolic events. We also sought to determine how under-or overanticoagulation would influence patient outcomes... - The effect of hospitalization on oral anticoagulation control: a population-based studyCarl van Walraven
Department of Medicine, University of Ottawa, Clinical Epidemiology Program, Ottawa Health Research Institute, C405, Ottawa Hospital, Civic Campus, 1053 Carling Avenue, Ottawa ON, K1Y 4E9, Canada
Thromb Res 119:705-14. 2007..Previous studies examining OAC control may not generalize because the patient population was select or INR capture was incomplete... - Long-term outcomes and resource utilization of endovascular versus open repair of abdominal aortic aneurysms in OntarioPrasad Jetty
Division of Vascular Surgery, The Ottawa Hospital, University of Ottawa, Ontario, Canada
J Vasc Surg 51:577-83, 583.e1-3. 2010..Despite these data, the use of EVAR continues to increase in North America. Currently, there are very limited adjusted population-based data examining long-term outcomes and resource utilization... - Validation of a discharge summary term search method to detect adverse eventsAlan J Forster
FRCPC, C406 1053 Carling Avenue, Ottawa, ON, Canada K1Y 4E9
J Am Med Inform Assoc 12:200-6. 2005..We performed this study to validate a previously derived method of adverse event detection using term searching in physician-dictated discharge summaries... - The impact of adverse events in the intensive care unit on hospital mortality and length of stayAlan J Forster
Department of Medicine, University of Ottawa, Ottawa, Canada
BMC Health Serv Res 8:259. 2008..We performed this study to measure the independent influence of intensive care unit (ICU) based AEs on in-hospital mortality and hospital length of stay... - Interactive voice response systems for improving delivery of ambulatory careNatalie Oake
Clinical Epidemiology Program, Ottawa Health Research Institute, 1053 Carling Ave, Ottawa, Ontario K1Y 4E9, Canada
Am J Manag Care 15:383-91. 2009..To comprehensively describe the populations, interventions, and outcomes of interactive voice response system (IVRS) clinical trials... - Does adding risk-trends to survival models improve in-hospital mortality predictions? A cohort studyJenna Wong
Clinical Epidemiology Program, Ottawa Hospital Research Institute, 1053 Carling Avenue, Ottawa, K1Y 4E9, Canada
BMC Health Serv Res 11:171. 2011..In this study, we used a unique approach to measure trends in patient hospital death risk and determined whether the incorporation of these trend measures into a survival model improved the accuracy of its risk predictions... - The usefulness of administrative databases for identifying disease cohorts is increased with a multivariate modelCarl van Walraven
Clinical Epidemiology Program, Ottawa Hospital Research Institute, F660 1053 Carling Avenue, Ottawa, Ontario, Canada
J Clin Epidemiol 63:1332-41. 2010..This would allow the accurate identification of a disease cohort in an administrative database... - Information exchange among physicians caring for the same patient in the communityCarl van Walraven
Clinical Epidemiology Program, Ottawa Health Research Institute, ASB1 003, Ottawa Hospital, Civic Campus, 1053 Carling Ave, Ottawa, ONK1Y4E9
CMAJ 179:1013-8. 2008..This study determined the probability that patient information from previous visits with other physicians was available for a current physician visit... - Incidence and contributors to potential drug-drug interactions in hospitalized patientsLeanne Reimche
Clinical Epidemiology Program, Ottawa Hospital Research Institute, Ottawa, Ontario, Canada
J Clin Pharmacol 51:1043-50. 2011..27 [2.23-2.30] for logarithm), and patient service (adjusted rate ratio, 1.49 [1.46-1.52] for surgical vs medical service). Potential DDIs were present during one fifth of hospitalization time... - The effect of hospital-acquired Clostridium difficile infection on in-hospital mortalityNatalie Oake
Clinical Quality and Performance Management, Ottawa Hospital, Ottawa, Ontario, Canada
Arch Intern Med 170:1804-10. 2010..We conducted this study to determine the independent impact of hospital-acquired CDI on in-hospital mortality after adjusting for the time-varying nature of CDI and baseline mortality risk at hospital admission... - Changes in surrogate outcomes can be translated into clinical outcomes using a Monte Carlo modelCarl van Walraven
Ottawa Health Research Institute, University of Ottawa, Ontario, Canada
J Clin Epidemiol 62:1306-15. 2009..Formulae to do this are uncommon because they require primary data from multiple randomized trials that measure both the surrogate and clinical outcome... - A clinical prediction rule to identify patients with atrial fibrillation and a low risk for stroke while taking aspirinCarl van Walraven
Clinical Epidemiology Unit, Ottawa Health Research Institute, Ottawa Hospital, Ontario, Canada
Arch Intern Med 163:936-43. 2003.... - A modification of the Elixhauser comorbidity measures into a point system for hospital death using administrative dataCarl van Walraven
Ottawa Health Research Institute, Ottawa, Ontario, Canada
Med Care 47:626-33. 2009..However, the Elixhauser classification system requires 30 binary variables, making its use for reporting and analysis of comorbidity cumbersome... - Reliability of the peer-review process for adverse event ratingAlan J Forster
The Ottawa Hospital, Ottawa, Ontario, Canada
PLoS ONE 7:e41239. 2012..Their identification requires the peer-review of poor outcomes, which may be unreliable. Combining physician ratings might improve the accuracy of adverse event classification... - Frequency of adverse events in patients with poor anticoagulation: a meta-analysisNatalie Oake
Department of Medicine, University of Ottawa, Ottawa, Ont
CMAJ 176:1589-94. 2007..To gauge the potential effect of improved anticoagulation control, we undertook to determine the proportion of anticoagulant-associated events that occur when INRs are outside the therapeutic range... - Anticoagulation control in the peri-hospitalization periodCarl van Walraven
Clinical Epidemiology Program, Ottawa Health Research Institute C404, Ottawa Hospital, Civic Campus, 1053 Carling Avenue, Ottawa, ON, K1Y 4E9, Canada
J Gen Intern Med 22:727-35. 2007..Anticoagulated patients discharged after medical hospitalizations could be targeted for improved anticoagulation control... - Incidence of potentially avoidable urgent readmissions and their relation to all-cause urgent readmissionsCarl van Walraven
Faculty of Medicine, University of Ottawa, Ottawa, Ont
CMAJ 183:E1067-72. 2011..Urgent, unplanned hospital readmissions are increasingly being used to gauge the quality of care. We reviewed urgent readmissions to determine which were potentially avoidable and compared rates of all-cause and avoidable readmissions... - Using the Johns Hopkins Aggregated Diagnosis Groups (ADGs) to predict mortality in a general adult population cohort in Ontario, CanadaPeter C Austin
Institute for Clinical Evaluative Sciences, Department of Health Management, Policy and Evaluation, University of Ottawa, Ottawa, Ontario, Canada
Med Care 49:932-9. 2011..There are limited validated methods for risk adjustment in ambulatory populations using administrative healthcare databases... - Identifying patients with post-discharge care problems using an interactive voice response systemAlan J Forster
Department of Medicine, University of Ottawa, Ottawa, Canada
J Gen Intern Med 24:520-5. 2009..We designed an interactive voice response system (IVRS) with the intent of identifying patients who might be experiencing an AE following discharge or were at risk of developing one... - Correlation between serial tests made disease probability estimates erroneousCarl van Walraven
Ottawa Health Research Institute, Ontario, Canada
J Clin Epidemiol 62:1301-5. 2009..The probability of a disease, given the result of two diagnostic tests, can be calculated by multiplying the odds of disease after the first test by the likelihood ratio of the second test... - Administrative database research infrequently used validated diagnostic or procedural codesCarl van Walraven
Ottawa Hospital Research Institute, Ottawa, Ontario, Canada
J Clin Epidemiol 64:1054-9. 2011..Measure the proportion of ADR studies using diagnostic or procedural codes that measured or referenced code accuracy... - Comparing methods to calculate hospital-specific rates of early death or urgent readmissionCarl van Walraven
Faculty of Medicine, University of Ottawa, Ottawa, Ontario, Canada
CMAJ 184:E810-7. 2012..Hospital-specific readmission rates have been reported as a quality-of-care indicator. However, the extent to which these measures vary with different calculation methods is uncertain... - Proportion of hospital readmissions deemed avoidable: a systematic reviewCarl van Walraven
Faculty of Medicine, University of Ottawa, Ottawa, Ont
CMAJ 183:E391-402. 2011..We conducted a systematic review of studies that measured the proportion of readmissions deemed avoidable. We examined how such readmissions were measured and estimated their prevalence... - Using an interactive voice response system to improve patient safety following hospital dischargeAlan J Forster
Department of Medicine, University of Ottawa, Ottawa, ON, Canada
J Eval Clin Pract 13:346-51. 2007..Patients often experience complications when transitioning from hospital to home. These complications are frequently related to poor monitoring. An interactive voice response system (IVRS) could improve post-discharge monitoring... - Ottawa Hospital Patient Safety Study: incidence and timing of adverse events in patients admitted to a Canadian teaching hospitalAlan J Forster
Ottawa Health Research Institute, Ottawa, Ont
CMAJ 170:1235-40. 2004..We evaluated characteristics of adverse events affecting patients admitted to a Canadian teaching hospital, paying particular attention to timing... - Association of diagnostic radiation exposure and second abdominal-pelvic malignancies after testicular cancerCarl van Walraven
University of Ottawa, Ottawa, Ontario, Canada
J Clin Oncol 29:2883-8. 2011..Men recovering from low-grade testicular cancer frequently undergo serial abdominal-pelvic computerized tomography (CT) scanning to monitor for recurrent disease... - Urgent readmission rates can be used to infer differences in avoidable readmission rates between hospitalsCarl van Walraven
Medicine, University of Ottawa, Ottawa Health Research Institute, Toronto, Canada
J Clin Epidemiol 65:1124-30. 2012..Most of the urgent readmissions are unavoidable. This study developed a method that used observed urgent readmission rates to compare the latent avoidable readmission rates between the two hospitals... - Influence of house-staff experience on teaching-hospital mortality: the "July phenomenon" revisitedCarl van Walraven
Faculty of Medicine, University of Ottawa, Ontario, Canada
J Hosp Med 6:389-94. 2011..Previous quantitative studies of new house-staff and increased mortality have been limited primarily by a focused patient population and the use of limited data to adjust for severity of patient illness... - A systematic review to evaluate the accuracy of electronic adverse drug event detectionAlan J Forster
Clinical Epidemiology Program, Ottawa Hospital Research Institute, Ottawa, Ontario, Canada
J Am Med Inform Assoc 19:31-8. 2012..Electronic detection of ADEs is a promising method to identify ADEs. We performed this systematic review to characterize established electronic detection systems and their accuracy... - Effect of study setting on anticoagulation control: a systematic review and metaregressionCarl van Walraven
Clinical Epidemiology Program, Ottawa Health Research Institute, C405, Ottawa Hospital, Civic Campus, 1053 Carling Ave, Ottawa, ON, K1Y 4E9 Canada
Chest 129:1155-66. 2006..The effect of study-level factors, especially study setting, on anticoagulation control is unknown... - The association between continuity of care and outcomes: a systematic and critical reviewCarl van Walraven
Department of Medicine, University of Ottawa, Clinical Epidemiology Program, Ottawa Hospital Research Institute, Ottawa, ON, Canada
J Eval Clin Pract 16:947-56. 2010..Studies doing so must actually measure continuity. If continuity and outcomes are measured concurrently, their association can only be determined with time-dependent methods... - Using prospective clinical surveillance to identify adverse events in hospitalAlan J Forster
The Ottawa Hospital, ON, Canada
BMJ Qual Saf 20:756-63. 2011..These findings suggest that institutions will need to evaluate service-specific safety problems to set priorities and design improvement strategies... - Automated patient assessments after outpatient surgery using an interactive voice response systemAlan J Forster
Department of Medicine, University of Ottawa, Ontario, Canada
Am J Manag Care 14:429-36. 2008..To test the feasibility and utility of an interactive voice response system (IVRS) for monitoring patients after outpatient surgery... - Adverse events among medical patients after discharge from hospitalAlan J Forster
Clinical Epidemiology Program, Ottawa Health Research Institute, Ottawa, Ontario, Canada
CMAJ 170:345-9. 2004..However, few data describe AEs after hospital discharge. We determined the incidence, severity, preventability and ameliorability of AEs in patients discharged from the general internal medicine service of a Canadian hospital... - Predicting potential survival benefit of renal transplantation in patients with chronic kidney diseaseCarl van Walraven
Faculty of Medicine, University of Ottawa, Ont
CMAJ 182:666-72. 2010..To facilitate decision-making about treatment options for patients with end-stage renal disease considering kidney transplantation, we sought to develop an index for clinical prediction of risk for death... - Risk of subsequent thromboembolism for patients with pre-eclampsiaCarl van Walraven
Ottawa Health Research Institute, Ottawa, Canada K1Y 4E9
BMJ 326:791-2. 2003 - The effect of a hepatitis serology testing algorithm on laboratory utilizationCarl van Walraven
Institute for Clinical Evaluative Sciences, Toronto, Canada
J Eval Clin Pract 8:327-32. 2002..Since over-utilization of hepatitis serological tests was suspected, a hepatitis serology testing algorithm was initiated in Ontario, Canada. This study determined the effects of this algorithm on utilization... - Dissemination of discharge summaries. Not reaching follow-up physiciansCarl van Walraven
Can Fam Physician 48:737-42. 2002..To discover how often hospital discharge summaries were available to physicians seeing patients for follow-up visits after hospitalization... - Effect of provider continuity on test repetitionCarl van Walraven
Network of Eastern Ontario Medical Laboratories NEO MeL, Ottawa, ONT Canada
Clin Chem 52:2219-28. 2006..A perceived benefit of PC is decreased test repetition. Repeat tests make up a significant proportion of overall laboratory utilization. This study determined whether test repetition increases when PC decreases... - The effect of hospital occupancy on emergency department length of stay and patient dispositionAlan J Forster
Departments of Medicine, University of Ottawa, Ottawa, Ontario, Canada
Acad Emerg Med 10:127-33. 2003..Emergency department (ED) overcrowding is a common problem. Despite a widespread belief that low hospital bed availability contributes to ED overcrowding, there are few data demonstrating this effect... - The effect of participation in a weight loss programme on short-term health resource utilizationCarl van Walraven
Department of Medicine, Institute for Clinical Evaluative Sciences, University of Ottawa, Ottawa, Ontario, Canada
J Eval Clin Pract 8:37-44. 2002..Further study is required to determine if patients who maintain their weight loss experience a decrease in health utilization... - Did publication of a clinical practice guideline recommendation to screen for type 2 diabetes in women with gestational diabetes change practice?Heather D Clark
Ottawa Health Research Institute, Ontario, Canada
Diabetes Care 26:265-8. 2003..To determine whether women with previous gestational diabetes mellitus (GDM) were screened postpartum for type 2 diabetes according to the Canadian Diabetes Association (CDA) guidelines... - Adverse events following 12 and 18 month vaccinations: a population-based, self-controlled case series analysisKumanan Wilson
Department of Medicine, Ottawa Hospital Research Institute, University of Ottawa, Ottawa, Canada
PLoS ONE 6:e27897. 2011..Live vaccines have distinct safety profiles, potentially causing systemic reactions one to 2 weeks after administration. In the province of Ontario, Canada, live MMR vaccine is currently recommended at age 12 months and 18 months... - Adverse events detected by clinical surveillance on an obstetric serviceAlan J Forster
Ottawa Health Research Institute, Department of Medicine, University of Ottawa, Ottawa, Ontario, Canada
Obstet Gynecol 108:1073-83. 2006..We performed this study to estimate the rate of adverse events and potential adverse events-errors that have a high likelihood of causing patient harm-occurring during obstetric care... - Time-dependent bias was common in survival analyses published in leading clinical journalsCarl van Walraven
Department of Medicine, University of Ottawa, Ottawa Hospital, Civic Campus, 1053 Carling Avenue, F 660, Ottawa, ON K1Y 4E9, Canada
J Clin Epidemiol 57:672-82. 2004..Time-dependent bias can occur if such variables are not analyzed appropriately. This study sought to determine the prevalence of such time-dependent bias in highly-cited medical journals... - Diabetic patients with prior specialist care have better glycaemic control than those with prior primary careBaiju R Shah
Institute for Clinical Evaluative Sciences, Toronto, ON, Canada
J Eval Clin Pract 11:568-75. 2005..To compare glycaemic control, as reflected in the A1c level, of diabetic patients with primary care vs. with specialist care... - Improving patient safety: moving beyond the "hype" of medical errorsAlan J Forster
Department of Medicine and the Ottawa Health Research Institute, University of Ottawa, Ottawa, Ont
CMAJ 173:893-4. 2005 - Risk of death or readmission among people discharged from hospital on FridaysCarl van Walraven
Clinical and Epidemiology Unit, Ottawa Health Research Institute, Ottawa Hospital, ON
CMAJ 166:1672-3. 2002 - A meta-analysis of hospital 30-day avoidable readmission ratesCarl van Walraven
University of Ottawa, Ottawa, Ontario, Canada
J Eval Clin Pract 18:1211-8. 2012..In this study, we generated a literature-based estimate for the proportion of 30-day urgent readmissions deemed avoidable for hospitals to use to gauge their performance in avoidable readmissions... - Administrative database research has unique characteristics that can risk biased resultsCarl van Walraven
Department of Medicine, Ottawa Hospital Research Institute, University of Ottawa, Ottawa, Ontario K1Y 4E9, Canada
J Clin Epidemiol 65:126-31. 2012.... - Combining ratings from multiple physician reviewers helped to overcome the uncertainty associated with adverse event classificationAlan J Forster
Department of Medicine, University of Ottawa, Ottawa, Ontario, Canada
J Clin Epidemiol 60:892-901. 2007..We performed this study to quantify the misclassification rate obtained using current AE detection methods and to evaluate the effect of combining physician AE ratings... - Oral anticoagulants vs aspirin in nonvalvular atrial fibrillation: an individual patient meta-analysisCarl van Walraven
Clinical Epidemiology Unit, Ottawa Health Research Institute, F 6, Ottawa Hospital, Civic Campus, 1053 Carling Ave, Ottawa, Ontario, Canada K1Y 4E9
JAMA 288:2441-8. 2002..Patients with nonvalvular atrial fibrillation (AF) have an increased risk of stroke and other vascular events... - Coding accuracy of abdominal aortic aneurysm repair procedures in administrative databases - a note of cautionPrasad Jetty
Division of Vascular Surgery, The Ottawa Hospital and University of Ottawa, Ottawa, ON, Canada
J Eval Clin Pract 17:91-6. 2011..This requires the use of procedural codes whose accuracy has not been established. In this study we measured the accuracy of procedural codes for open AAA repair and endovascular aneurysm repair (EVAR) in administrative databases... - Derivation and validation of a MEDLINE search strategy for research studies that use administrative dataCarl van Walraven
Ottawa Hospital Research Institute, Institute for Clinical Evaluative Sciences, ASB 1 003 1053 Carling Avenue, Ottawa, ON
Health Serv Res 45:1836-45. 2010..To derive and validate a search strategy that identifies administrative database research (ADR) in the MEDLINE database... - Population-based study of repeat laboratory testingCarl van Walraven
Clinical Epidemiology Program, Ottawa Health Research Institute, C405, Ottawa Hospital, Civic Campus, 1053 Carling Ave, Ottawa, ON K1Y 4E9, Canada
Clin Chem 49:1997-2005. 2003..Laboratory test repetition has not been rigorously studied at a population-based level. Our objective was to determine the prevalence of, and charges associated with, repetition of eight common laboratory tests... - Prevalence of information gaps in the emergency department and the effect on patient outcomesAndrew Stiell
Clinical Epidemiology Unit, Ottawa Health Research Institute, ON
CMAJ 169:1023-8. 2003..INTERPRETATION: Information gaps were present in almost one-third of the visits to our emergency department. They were more common in sicker patients and were independently associated with a prolonged stay in the emergency department... - Mycophenolate mofetil dose reduction and the risk of acute rejection after renal transplantationGreg A Knoll
Division of Nephrology, Kidney Research Centre, and Department of Medicine, University of Ottawa, and Clinical Epidemiology Unit, Ottawa Health Research Institute, Ottawa, Ontario, Canada
J Am Soc Nephrol 14:2381-6. 2003..Clinicians need to be aware of the rejection risk when the MMF dose is reduced and maintain close surveillance on such patients... - How far is the sternal angle from the mid-right atrium?Ratika Seth
Department of Medicine, University of Ottawa, Ontario, Canada
J Gen Intern Med 17:852-6. 2002..Classical clinical teaching quotes this distance as 5 cm, invariable between patients, and invariable with changes in the elevation of the patient's head. The validity of these JVP characteristics has been questioned... - Restricted driver licensing for medical impairments: does it work?Shawn C Marshall
Department of Medicine, University of Ottawa, Ont
CMAJ 167:747-51. 2002.... - When laboratories report estimated glomerular filtration rates in addition to serum creatinines, nephrology consults increaseArsh K Jain
Division of Nephrology, Department of Medicine, University of Western Ontario, London, Ontario, Canada
Kidney Int 76:318-23. 2009..However, it remains to be seen whether the routine reporting of eGFR results in improved treatment and outcomes for those with chronic kidney disease... - Renin-angiotensin system blockade and the risk of hyperkalemia in chronic hemodialysis patientsGreg A Knoll
Division of Nephrology, Department of Medicine, Kidney Research Centre, The Ottawa Hospital Research Institute, University of Ottawa, Ottawa, Ontario, Canada
Am J Med 112:110-4. 2002..The serum potassium concentration should be closely monitored when these medications are prescribed for hemodialysis patients... - Effect of follow-up physician visits on emergency readmissionsCarl van Walraven
Am J Med 113:347; author reply 347. 2002 - Comparison of 12 risk stratification schemes to predict stroke in patients with nonvalvular atrial fibrillationRobert G Hart
Stroke 39:1901-10. 2008..Additional research to identify an optimum scheme for primary prevention and subsequent standardization of recommendations may lead to more uniform selection of patients for anticoagulant prophylaxsis... - Maternal age and risk of stillbirth: a systematic reviewLing Huang
Health Surveillance and Epidemiology Division, Centre for Health Promotion, Public Health Agency of Canada, Ottawa, Ont
CMAJ 178:165-72. 2008..In this systematic review we explored whether older maternal age is associated with an increased risk of stillbirth... - Quantifying the impact of survivor treatment bias in observational studiesPeter C Austin
Institute for Clinical Evaluative Sciences, Toronto, Ontario, Canada
J Eval Clin Pract 12:601-12. 2006..Survivor treatment bias can arise when the time dependent nature of treatment exposure is ignored since patients who survived to receive treatment may be healthier than patients who died prior to receipt of treatment... - Additive role of plasma von Willebrand factor levels to clinical factors for risk stratification of patients with atrial fibrillationGregory Y H Lip
Haemostasis, Thrombosis and Vascular Biology Unit, University Department of Medicine, City Hospital, Birmingham, England
Stroke 37:2294-300. 2006..This study determined the additive role of plasma vWf levels to clinical factors for risk stratification in patients with AF... - Utilization and outcomes of HbA1c testing: a population-based studyGraham Woodward
CMAJ 174:327-9. 2006 - Identifying individuals with a reduced GFR using ambulatory laboratory database surveillanceAmit X Garg
Division of Nephrology, University of Western Ontario, London Kidney Clinical Research Unit, Room A01, Westminster Tower, London Health Sciences Centre, 800 Commissioners Road East, London, Ontario N6A 4G5, Canada
J Am Soc Nephrol 16:1433-9. 2005..Whether such identification leads to improved health outcomes warrants further study... - Clinical inertia in response to inadequate glycemic control: do specialists differ from primary care physicians?Baiju R Shah
Institute for Clinical Evaluative Sciences, G106 2075 Bayview Ave, Toronto, ON, Canada M4N 3M5
Diabetes Care 28:600-6. 2005..quot; Because data suggest that specialist care results in better control than primary care, we evaluated whether specialists demonstrated less clinical inertia than primary care physicians... - Impact of specialist follow-up in outpatients with congestive heart failureJustin A Ezekowitz
Division of Cardiology, University of Alberta, Edmonton, Alta
CMAJ 172:189-94. 2005..Methods to improve timely and appropriate access to specialists and to improve collaborative care structures are needed... - Selecting patients with atrial fibrillation for anticoagulation: stroke risk stratification in patients taking aspirinBrian F Gage
Division of General Medical Sciences, Washington University School of Medicine Campus Box 8005, 660 S Euclid Ave, St Louis, MO 63110, USA
Circulation 110:2287-92. 2004..This prospective cohort study tested the predictive accuracy of 5 stroke risk stratification schemes... - Bias in revascularization studyCarl van Walraven
CMAJ 176:1125; author reply 1125. 2007 - Practice guidelines and practicing physicians-who's guiding whom?Carl van Walraven
Clin Chem 48:9-10. 2002 - Effect of a controlled feedback intervention on laboratory test ordering by community physiciansPeter S Bunting
Gamma Dynacare Medical Laboratories, Brampton, Ontario, Canada
Clin Chem 50:321-6. 2004..We determined whether laboratory test utilization by community physicians could be reduced by a multifaceted program of education and feedback...