RT Journal Article SR Electronic T1 Use of evidence-based therapies after discharge among elderly patients with acute myocardial infarction JF Canadian Medical Association Journal JO CMAJ FD Canadian Medical Association SP 895 OP 900 DO 10.1503/cmaj.071481 VO 179 IS 9 A1 Peter C. Austin, PhD A1 Jack V. Tu, MD PhD A1 Dennis T. Ko, MD MSc A1 David A. Alter, MD PhD YR 2008 UL http://www.cmaj.ca/content/179/9/895.abstract AB Background: Postdischarge use of evidence-based drug therapies has been proposed as a measure of quality of care for myocardial infarction patients. We examined trends in the use of evidence-based drug therapies after discharge among elderly patients with myocardial infarction. Methods: We performed a cross-sectional study in a retrospective population-based cohort that was created using linked administrative databases. We included patients aged 65 years and older who were discharged from hospital with a diagnosis of myocardial infarction between Apr. 1, 1992, and Mar. 31, 2005. We determined the annual percentage of patients who filled a prescription for statins, β-blockers and angiotensin-modifying drugs within 90 days after discharge. Results: The percentage of patients who filled a prescription for a β-blocker increased from 42.6% in 1992 to 78.1% in 2005. The percentage of patients who filled a prescription for an angiotensin-modifying drug increased from 42.0% in 1992 to 78.4% in 2005. The percentage of patients who filled a prescription for a statin increased from 4.2% in 1992 to 79.2% in 2005. In 2005, about half of the hospitals had rates of use for each of these therapies that were less than 80%. The temporal rate of increase in statin use after discharge was slower among noncardiologists than among cardiologists (3.5%–2.8% slower). The rate of increase was 4.8% slower for among physicians with low volumes of myocardial infarction patients than among those with high volumes of such patients and was 5.7% greater at teaching hospitals compared with nonteaching hospitals. Interpretation: Use of statins, β-blockers and angiotensin-modifying drugs increased from 1992 to 2005. The rate of increase in the use of these medications after discharge varied across physician and hospital characteristics.