Alan J Forster

Summary

Affiliation: Ottawa Health Research Institute
Country: Canada

Publications

  1. pmc Using novel Canadian resources to improve medication reconciliation at discharge: study protocol for a randomized controlled trial
    Robyn Tamblyn
    Department of Epidemiology, Biostatistics and Occupational Health, McGill University, 1020 Pine Avenue West, Montreal, QC H3A 1A2, Canada
    Trials 13:150. 2012
  2. pmc Semantic querying of relational data for clinical intelligence: a semantic web services-based approach
    Alexandre Riazanov
    Department of Computer Science and Applied Statistics, University of New Brunswick, Saint John, NB, Canada
    J Biomed Semantics 4:9. 2013
  3. pmc The Seamless Transfer-of-Care Protocol: a randomized controlled trial assessing the efficacy of an electronic transfer-of-care communication tool
    Barbara M Okoniewska
    Department of Community Health Sciences, W21C Research and Innovation Centre, Institute of Public Health, University of Calgary, 3280 Hospital Drive NW, Calgary, AB, Canada
    BMC Health Serv Res 12:414. 2012
  4. pmc The use of quality indicators to promote accountability in health care: the good, the bad, and the ugly
    Alan J Forster
    Performance Measurement, The Ottawa Hospital, Ottawa, Ontario, Canada
    Open Med 6:e75-9. 2012
  5. doi request reprint Patient-level factors associated with methicillin-resistant Staphylococcus aureus carriage at hospital admission: a systematic review
    Alan J Forster
    Performance Measurement, The Ottawa Hospital, Ottawa, ON, Canada
    Am J Infect Control 41:214-20. 2013
  6. pmc Improving patient safety through the systematic evaluation of patient outcomes
    Alan J Forster
    The Ottawa Hospital, The Department of Medicine, University of Ottawa, The Clinical Epidemiology Program, Ottawa Hospital Research Institute, Ottawa, Ont, Canada
    Can J Surg 55:418-25. 2012
  7. pmc A systematic review to evaluate the accuracy of electronic adverse drug event detection
    Alan J Forster
    Clinical Epidemiology Program, Ottawa Hospital Research Institute, Ottawa, Ontario, Canada
    J Am Med Inform Assoc 19:31-8. 2012
  8. pmc Reliability of the peer-review process for adverse event rating
    Alan J Forster
    The Ottawa Hospital, Ottawa, Ontario, Canada
    PLoS ONE 7:e41239. 2012
  9. pmc The effect of hospital-acquired infection with Clostridium difficile on length of stay in hospital
    Alan J Forster
    Clinical Epidemiology Program, Ottawa Hospital Research Institute, Ottawa, Ont
    CMAJ 184:37-42. 2012
  10. pmc What is the value and impact of quality and safety teams? A scoping review
    Deborah E White
    Faculty of Nursing, University of Calgary, 2500 University Drive NW, Calgary, Alberta T2N 1N4, Canada
    Implement Sci 6:97. 2011

Collaborators

Detail Information

Publications86

  1. pmc Using novel Canadian resources to improve medication reconciliation at discharge: study protocol for a randomized controlled trial
    Robyn Tamblyn
    Department of Epidemiology, Biostatistics and Occupational Health, McGill University, 1020 Pine Avenue West, Montreal, QC H3A 1A2, Canada
    Trials 13:150. 2012
    ..An electronically enabled discharge reconciliation process represents an innovative approach to this problem...
  2. pmc Semantic querying of relational data for clinical intelligence: a semantic web services-based approach
    Alexandre Riazanov
    Department of Computer Science and Applied Statistics, University of New Brunswick, Saint John, NB, Canada
    J Biomed Semantics 4:9. 2013
    ..Since most of the data are currently stored in relational or similar form, ad hoc querying is problematic as it requires specialised technical skills and the knowledge of particular data schemas...
  3. pmc The Seamless Transfer-of-Care Protocol: a randomized controlled trial assessing the efficacy of an electronic transfer-of-care communication tool
    Barbara M Okoniewska
    Department of Community Health Sciences, W21C Research and Innovation Centre, Institute of Public Health, University of Calgary, 3280 Hospital Drive NW, Calgary, AB, Canada
    BMC Health Serv Res 12:414. 2012
    ..This study examines whether a transfer-of-care (TOC) communication tool is efficacious and cost-effective for reducing hospital readmission, adverse events and adverse drug events as well as reducing death...
  4. pmc The use of quality indicators to promote accountability in health care: the good, the bad, and the ugly
    Alan J Forster
    Performance Measurement, The Ottawa Hospital, Ottawa, Ontario, Canada
    Open Med 6:e75-9. 2012
    ..To meet these recommendations the health system needs to increased investment in performance measurement systems...
  5. doi request reprint Patient-level factors associated with methicillin-resistant Staphylococcus aureus carriage at hospital admission: a systematic review
    Alan J Forster
    Performance Measurement, The Ottawa Hospital, Ottawa, ON, Canada
    Am J Infect Control 41:214-20. 2013
    ..To characterize high-risk populations, we conducted this systematic review to identify patient-level factors associated with MRSA carriage at hospital admission...
  6. pmc Improving patient safety through the systematic evaluation of patient outcomes
    Alan J Forster
    The Ottawa Hospital, The Department of Medicine, University of Ottawa, The Clinical Epidemiology Program, Ottawa Hospital Research Institute, Ottawa, Ont, Canada
    Can J Surg 55:418-25. 2012
    ..We also present an overview of how patient safety can be assessed and the strengths and weaknesses of each method and comment on some of the consequences created by the absence of a systematic measurement system...
  7. pmc A systematic review to evaluate the accuracy of electronic adverse drug event detection
    Alan 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...
  8. pmc Reliability of the peer-review process for adverse event rating
    Alan 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...
  9. pmc The effect of hospital-acquired infection with Clostridium difficile on length of stay in hospital
    Alan J Forster
    Clinical Epidemiology Program, Ottawa Hospital Research Institute, Ottawa, Ont
    CMAJ 184:37-42. 2012
    ..We determined the independent impact of hospital-acquired infection with C. difficile on length of stay in hospital...
  10. pmc What is the value and impact of quality and safety teams? A scoping review
    Deborah E White
    Faculty of Nursing, University of Calgary, 2500 University Drive NW, Calgary, Alberta T2N 1N4, Canada
    Implement Sci 6:97. 2011
    ..The purpose of this study was to conduct a scoping review of the literature about the establishment and impact of quality and safety team initiatives in acute care...
  11. ncbi request reprint The effect of hospital occupancy on emergency department length of stay and patient disposition
    Alan 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...
  12. pmc The impact of adverse events in the intensive care unit on hospital mortality and length of stay
    Alan 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...
  13. ncbi request reprint Using an interactive voice response system to improve patient safety following hospital discharge
    Alan 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...
  14. ncbi request reprint Combining ratings from multiple physician reviewers helped to overcome the uncertainty associated with adverse event classification
    Alan 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...
  15. pmc Using prospective clinical surveillance to identify adverse events in hospital
    Alan 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...
  16. ncbi request reprint Automated patient assessments after outpatient surgery using an interactive voice response system
    Alan 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...
  17. pmc Identifying patients with post-discharge care problems using an interactive voice response system
    Alan 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...
  18. ncbi request reprint Adverse events detected by clinical surveillance on an obstetric service
    Alan 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...
  19. pmc Adverse events following an emergency department visit
    Alan 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)...
  20. pmc Adverse events among medical patients after discharge from hospital
    Alan 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...
  21. pmc Ottawa Hospital Patient Safety Study: incidence and timing of adverse events in patients admitted to a Canadian teaching hospital
    Alan 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...
  22. ncbi request reprint Pharmacist surveillance of adverse drug events
    Alan J Forster
    Ottawa Health Research Institute, Ontario, Canada
    Am J Health Syst Pharm 61:1466-72. 2004
    ..The incidence of adverse drug events (ADEs), preventable ADEs, and potential ADEs was determined using pharmacist surveillance. Drug classes associated with ADEs were also identified...
  23. pmc Validation of a discharge summary term search method to detect adverse events
    Alan 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...
  24. pmc Improving patient safety and physician accountability using the hospital credentialing process
    Alan J Forster
    Ottawa Hospital, Ottawa, Ontario, Canada
    Open Med 5:e79-86. 2011
    ..Central licensing authorities could help to coordinate these programs on a province- or state-wide basis to ensure uniformity of standards and to avoid duplication of efforts...
  25. pmc Adverse drug events occurring following hospital discharge
    Alan J Forster
    Division of General Internal Medicine and Ottawa Health Research Institute, University of Ottawa, Ottawa, Ontario, Canada
    J Gen Intern Med 20:317-23. 2005
    ..To describe the incidence of adverse drug events (ADEs), preventable ADEs, and ameliorable ADEs occurring after hospital discharge and their associated risk factors...
  26. ncbi request reprint Effect of a nurse team coordinator on outcomes for hospitalized medicine patients
    Alan 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...
  27. pmc Improving patient safety: moving beyond the "hype" of medical errors
    Alan J Forster
    Department of Medicine and the Ottawa Health Research Institute, University of Ottawa, Ottawa, Ont
    CMAJ 173:893-4. 2005
  28. doi request reprint A risk scoring system to identify emergency department patients with heart failure at high risk for serious adverse events
    Ian G Stiell
    Department of Emergency Medicine, University of Ottawa, Ottawa, Ontario, Canada
    Acad Emerg Med 20:17-26. 2013
    ..The authors sought to develop a risk scoring system to identify HF patients at high risk for serious adverse events (SAEs)...
  29. pmc The Procedural Index for Mortality Risk (PIMR): an index calculated using administrative data to quantify the independent influence of procedures on risk of hospital death
    Carl 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...
  30. doi request reprint The influence of incidental abdominal aortic aneurysm monitoring on patient outcomes
    Carl 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...
  31. pmc Radiographic monitoring of incidental abdominal aortic aneurysms: a retrospective population-based cohort study
    Carl 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...
  32. pmc LACE+ index: extension of a validated index to predict early death or urgent readmission after hospital discharge using administrative data
    Carl van Walraven
    Ottawa Hospital Research Institute, Administrative Services Building, Room 1003, 1053 Carling Avenue, Ottawa, ON K1Y 4E9, Canada
    Open Med 6:e80-90. 2012
    ....
  33. doi request reprint The independent association of provider and information continuity on outcomes after hospital discharge: implications for hospitalists
    Carl 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...
  34. ncbi request reprint Burden of potentially avoidable anticoagulant-associated hemorrhagic and thromboembolic events in the elderly
    Carl 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...
  35. ncbi request reprint A prospective cohort study found that provider and information continuity was low after patient discharge from hospital
    Carl 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...
  36. pmc Derivation and validation of a diagnostic score based on case-mix groups to predict 30-day death or urgent readmission
    Carl van Walraven
    Ottawa Hospital Research Institute, Administrative Services Building, Room 1003, 1053 Carling Avenue, Ottawa, ON K1Y 4E9, Canada
    Open Med 6:e90-e100. 2012
    ..In this study, we derived and validated a score summarizing the influence of acute hospital diagnoses and procedures on death or urgent readmission within 30 days...
  37. ncbi request reprint The effect of hospital-acquired Clostridium difficile infection on in-hospital mortality
    Natalie 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...
  38. ncbi request reprint Incidence, follow-up, and outcomes of incidental abdominal aortic aneurysms
    Carl 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...
  39. ncbi request reprint The incidence and severity of adverse events affecting patients after discharge from the hospital
    Alan J Forster
    University of Ottawa, F654 1053 Carling Avenue, Ottawa, Ontario K1Y 4E9, Canada
    Ann Intern Med 138:161-7. 2003
    ..Studies of hospitalized patients identify safety as a significant problem, but few data are available regarding injuries occurring after discharge. Patients may be vulnerable during this transition period...
  40. pmc Derivation and validation of an index to predict early death or unplanned readmission after discharge from hospital to the community
    Carl 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...
  41. doi request reprint Addition of time-dependent covariates to a survival model significantly improved predictions for daily risk of hospital death
    Jenna Wong
    Department of Clinical Epidemiology, Ottawa Hospital Research Institute, Ottawa, ON, Canada
    J Eval Clin Pract 19:351-7. 2013
    ..RATIONAL, AIMS AND OBJECTIVES: The study aims to determine the extent to which the addition of post-admission information via time-dependent covariates improved the ability of a survival model to predict the daily risk of hospital death...
  42. doi request reprint Mapping out the emergency department disposition decision for high-acuity patients
    Lisa A Calder
    Department of Emergency Medicine, University of Ottawa, Ottawa, Ontario, Canada
    Ann Emerg Med 60:567-576.e4. 2012
    ..This study seeks to create a process map, a visual step-by-step diagram, and highlight error-prone areas for disposition decisions for high-acuity or nonambulatory ED patients...
  43. ncbi request reprint Unplanned admission after day surgery: a historical cohort study in patients with obstructive sleep apnea
    Gregory L Bryson
    Department of Anesthesiology, The Ottawa Hospital, Box 249C, Ottawa, ON, Canada
    Can J Anaesth 59:842-51. 2012
    ..This study evaluated outcomes following ambulatory surgery in patients who had previously undergone polysomnography (PSG), and compared unplanned admissions in patients diagnosed with OSA with those in patients without OSA...
  44. doi request reprint Incidence and contributors to potential drug-drug interactions in hospitalized patients
    Leanne 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...
  45. pmc Does adding risk-trends to survival models improve in-hospital mortality predictions? A cohort study
    Jenna 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...
  46. pmc Information exchange among physicians caring for the same patient in the community
    Carl 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...
  47. pmc Anticoagulation intensity and outcomes among patients prescribed oral anticoagulant therapy: a systematic review and meta-analysis
    Natalie 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...
  48. doi request reprint The usefulness of administrative databases for identifying disease cohorts is increased with a multivariate model
    Carl 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...
  49. ncbi request reprint Interactive voice response systems for improving delivery of ambulatory care
    Natalie 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...
  50. ncbi request reprint Predicting post-discharge death or readmission: deterioration of model performance in population having multiple admissions per patient
    Carl van Walraven
    Clinical Epidemiology, Ottawa Hospital Research Institute, Ottawa, Ontario, Canada Institute for Clinical Evaluative Sciences, Ottawa, Ontario, Canada Department of Medicine, University of Ottawa, Ottawa, Ontario, Canada
    J Eval Clin Pract 19:1012-8. 2013
    ..To avoid biased estimates of standard errors in regression models, statisticians commonly limit the analytical dataset to one observation per patient...
  51. doi request reprint Influence of neighborhood household income on early death or urgent hospital readmission
    Carl van Walraven
    Ottawa Hospital Research Institute and Institute for Clinical Evaluative Sciences, Ottawa, Canada
    J Hosp Med 8:261-6. 2013
    ..The relationship of socioeconomic status (SES) with hospital readmissions is unclear...
  52. ncbi request reprint The effect of hospitalization on oral anticoagulation control: a population-based study
    Carl 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...
  53. ncbi request reprint Changes in surrogate outcomes can be translated into clinical outcomes using a Monte Carlo model
    Carl 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...
  54. doi request reprint A modification of the Elixhauser comorbidity measures into a point system for hospital death using administrative data
    Carl 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...
  55. pmc Effect of an interactive voice response system on oral anticoagulant management
    Natalie 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...
  56. ncbi request reprint Validation of international algorithms to identify adults with inflammatory bowel disease in health administrative data from Ontario, Canada
    Eric I Benchimol
    Institute for Clinical Evaluative Sciences, 2075 Bayview Avenue, Toronto, Ontario, Canada, M4N 3M5 CHEO Inflammatory Bowel Disease Centre, Division of Gastroenterology, Hepatology and Nutrition, Children s Hospital of Eastern Ontario, 401 Smyth Road, Ottawa, Ontario, Canada K1H 8L1 Department of Pediatrics, University of Ottawa, 451 Smyth Road, Ottawa, Ontario, Canada, K1H 8M5 Department of Epidemiology and Community Medicine, University of Ottawa, 451 Smyth Road, Ottawa, Ontario, Canada, K1H 8M5 Electronic address
    J Clin Epidemiol 67:887-96. 2014
    ..Case validation is necessary to ensure accurate disease ascertainment using these databases. In this study, we aimed to validate adult-onset inflammatory bowel disease (IBD) identification algorithms...
  57. doi request reprint Administrative database research infrequently used validated diagnostic or procedural codes
    Carl 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...
  58. ncbi request reprint The Kaiser Permanente inpatient risk adjustment methodology was valid in an external patient population
    Carl 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...
  59. ncbi request reprint Correlation between serial tests made disease probability estimates erroneous
    Carl 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...
  60. doi request reprint Effect of beta-blocker prescription on the incidence of postoperative myocardial infarction after hip and knee arthroplasty
    Wilton A van Klei
    Department of Anesthesiology, The Ottawa Hospital, Civic Site, Ottawa, Ontario, Canada
    Anesthesiology 111:717-24. 2009
    ..The authors evaluated the effect of perioperative beta-blockade on postoperative myocardial infarction (POMI) in low-risk patients undergoing intermediate-risk surgery...
  61. pmc Incidence of potentially avoidable urgent readmissions and their relation to all-cause urgent readmissions
    Carl 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...
  62. ncbi request reprint Appropriateness of diagnostic strategies for evaluating suspected venous thromboembolism
    Thomas Arnason
    Ottawa Health Research Institute Clinical Epidemiology Program, Ottawa, ON, Canada
    Thromb Haemost 97:195-201. 2007
    ..In conclusion, physicians often fail to use diagnostic testing strategies for VTE correctly following a D-dimer test...
  63. pmc Anticoagulation control in the peri-hospitalization period
    Carl 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...
  64. pmc Frequency of adverse events in patients with poor anticoagulation: a meta-analysis
    Natalie 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...
  65. doi request reprint A meta-analysis of hospital 30-day avoidable readmission rates
    Carl 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...
  66. doi request reprint Influence of house-staff experience on teaching-hospital mortality: the "July phenomenon" revisited
    Carl 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...
  67. doi request reprint Association of diagnostic radiation exposure and second abdominal-pelvic malignancies after testicular cancer
    Carl 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...
  68. pmc Proportion of hospital readmissions deemed avoidable: a systematic review
    Carl 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...
  69. pmc Prevalence of information gaps in the emergency department and the effect on patient outcomes
    Andrew Stiell
    Clinical Epidemiology Unit, Ottawa Health Research Institute, ON
    CMAJ 169:1023-8. 2003
    ..In this study we measured the prevalence of physician-reported information gaps for patients presenting to an emergency department at a teaching hospital...
  70. ncbi request reprint Prevalence of information gaps for seniors transferred from nursing homes to the emergency department
    Matthew A Cwinn
    Department of Emergency Medicine, University of Ottawa, Ottawa, Ontario
    CJEM 11:462-71. 2009
    ..For patients transferred to an emergency department (ED) from a nursing home or seniors residence, we determined the frequency and type of clinically important information gaps and the impact of a regional transfer form...
  71. pmc Comparing methods to calculate hospital-specific rates of early death or urgent readmission
    Carl 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...
  72. ncbi request reprint Effect of study setting on anticoagulation control: a systematic review and metaregression
    Carl 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...
  73. ncbi request reprint Urgent readmission rates can be used to infer differences in avoidable readmission rates between hospitals
    Carl 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...
  74. doi request reprint The association between continuity of care and outcomes: a systematic and critical review
    Carl 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...
  75. pmc Hospital mortality: when failure is not a good measure of success
    Kaveh G Shojania
    Department of Medicine, University of Ottawa, ON, USA
    CMAJ 179:153-7. 2008
  76. pmc Derivation and validation of a MEDLINE search strategy for research studies that use administrative data
    Carl 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...
  77. pmc Using Medical Emergency Teams to detect preventable adverse events
    Akshai Iyengar
    Department of Medicine, Faculty of Medicine, University of Ottawa, 451 Smyth Road, Ottawa, ON, K1H 8M5, Canada
    Crit Care 13:R126. 2009
    ..We describe how we used MET calls to systematically identify preventable adverse events in an academic tertiary care hospital, and describe our surveillance results...
  78. pmc Can you prevent adverse drug events after hospital discharge?
    Alan J Forster
    Division of General Internal Medicine, University of Ottawa, and Clinical Epidemiology Program, Ottawa Health Research Institute, Ottawa, Ont
    CMAJ 174:921-2. 2006
  79. doi request reprint Experiential and rational decision making: a survey to determine how emergency physicians make clinical decisions
    Lisa A Calder
    Department of Emergency Medicine, University of Ottawa, Ottawa, Ontario, Canada
    Emerg Med J 29:811-6. 2012
    ..Dual-process psychological theories argue that clinical decision making is achieved through a combination of experiential (fast and intuitive) and rational (slower and systematic) cognitive processes...
  80. ncbi request reprint Time-dependent bias was common in survival analyses published in leading clinical journals
    Carl 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...
  81. ncbi request reprint The rationale and evidence for the treatment of lower-extremity deep venous thrombosis with thrombolytic agents
    Alan J Forster
    Department of Medicine and the Ottawa Health Research Institute, University of Ottawa, Ontario, Canada
    Curr Opin Hematol 9:437-42. 2002
    ..Therefore, the authors conclude that although the lysis rate is greater for thrombolytic agents, they cannot be recommended routinely for DVT treatment...
  82. doi request reprint The uptake of technologies designed to influence medication safety in Canadian hospitals
    Michael Saginur
    Memorial University of Newfoundland, St John s, Canada
    J Eval Clin Pract 14:27-35. 2008
    ..There are many technologies designed to improve medication safety. Although limited evidence supports their use, there are pressures to implement them...
  83. pmc Electronically screening discharge summaries for adverse medical events
    Harvey J Murff
    Division of General Internal Medicine, Brigham and Women s Hospital, Boston, MA 02115, USA
    J Am Med Inform Assoc 10:339-50. 2003
    ..The authors hypothesized that discharge summaries would include information on adverse events, and they developed and evaluated an electronic method for screening medical discharge summaries for adverse events...
  84. ncbi request reprint An agenda for reducing emergency department crowding
    Alan J Forster
    Ann Emerg Med 45:479-81. 2005
  85. pmc Identifying wrist fracture patients with high accuracy by automatic categorization of X-ray reports
    Berry de Bruijn
    NRC IIT, 1200 Montreal Road, Building M 50, Ottawa ON, Canada
    J Am Med Inform Assoc 13:696-8. 2006
    ..8% accuracy; 95.5% sensitivity; 92.9% specificity; and 87.5% positive predictive value. TC-1 was easy to implement and superior in performance to the other classification methods...
  86. pmc Bias in revascularization study
    Carl van Walraven
    CMAJ 176:1125; author reply 1125. 2007