title: The medical office of the 21st century (MOXXI): effectiveness of computerized decision-making support in reducing inappropriate prescribing in primary care.
abstract: BACKGROUND
  Adverse drug-related events are common in the elderly, and inappropriate prescribing is a preventable risk factor. Our objective was to determine whether inappropriate prescribing could be reduced when primary care physicians had computer-based access to information on all prescriptions dispensed and automated alerts for potential prescribing problems.
  
  
  METHODS
  We randomly assigned 107 primary care physicians with at least 100 patients aged 66 years and older (total 12 560) to a group receiving computerized decision-making support (CDS) or a control group. Physicians in the CDS group had access to information on current and past prescriptions through a dedicated computer link to the provincial seniors' drug-insurance program. When any of 159 clinically relevant prescribing problems were identified by the CDS software, the physician received an alert that identified the nature of the problem, possible consequences and alternative therapy. The rate of initiation and discontinuation of potentially inappropriate prescriptions was assessed over a 13-month period.
  
  
  RESULTS
  In the 2 months before the study, 31.8% of the patients in the CDS group and 33.3% of those in the control group had at least 1 potentially inappropriate prescription. During the study the number of new potentially inappropriate prescriptions per 1000 visits was significantly lower (18%) in the CDS group than in the control group (relative rate [RR] 0.82, 95% confidence interval [CI] 0.69-0.98), but differences between the groups in the rate of discontinuation of potentially inappropriate prescriptions were significant only for therapeutic duplication by the study physician and another physician (RR 1.66, 95% CI 0.99-2.79) and drug interactions caused by prescriptions written by the study physician (RR 2.15, 95% CI 0.98-4.70).
  
  
  CONCLUSIONS
  Computer-based access to complete drug profiles and alerts about potential prescribing problems reduces the rate of initiation of potentially inappropriate prescriptions but has a more selective effect on the discontinuation of such prescriptions.
authors.affiliation: Department of Medicine, McGill University, Montreal, Que. robyn.tamblyn@mcgill.ca
authors.forename: Robyn
authors.initials: R
authors.lastname: Tamblyn
authors.forename: Allen
authors.initials: A
authors.lastname: Huang
authors.forename: Robert
authors.initials: R
authors.lastname: Perreault
authors.forename: André
authors.initials: A
authors.lastname: Jacques
authors.forename: Denis
authors.initials: D
authors.lastname: Roy
authors.forename: James
authors.initials: J
authors.lastname: Hanley
authors.forename: Peter
authors.initials: P
authors.lastname: McLeod
authors.forename: Réjean
authors.initials: R
authors.lastname: Laprise
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D016303:Clinical Pharmacy Information Systems; D020000:Decision Support Systems, Clinical; D004346:Drug Information Services; D004347:Drug Interactions; D011307:Drug Prescriptions / Q000706:statistics & numerical data; D004360:Drug Therapy, Computer-Assisted; D004363:Drug Utilization / Q000706:statistics & numerical data* / Q000639:trends; D005260:Female; D006300:Health Services Misuse; D006801:Humans; D007356:Insurance, Pharmaceutical Services; D008297:Male; D008508:Medication Errors / Q000517:prevention & control; D008875:Middle Aged; D010817:Physician-Patient Relations; D010818:Practice Patterns, Physicians' / Q000706:statistics & numerical data* / Q000639:trends; D011320:Primary Health Care / Q000379:methods* / Q000592:standards; D011792:Quebec; D016896:Treatment Outcome