title: Adherence to evidence-based therapies after discharge for acute coronary syndromes: an ongoing prospective, observational study.
abstract: OBJECTIVE
  To determine the rates of patient adherence to key evidence-based therapies at 6 months after hospital discharge for an acute coronary syndrome.
  
  
  METHODS
  In this nonrandomized, prospective, multinational, multicenter study, adherence to aspirin, beta-blockers, statins, or angiotensin-converting enzyme (ACE) inhibitors 6 months after discharge for myocardial infarction or unstable angina was assessed in 21,408 patients aged 18 years or older. Patients were enrolled at 104 tertiary and community hospitals representing a broad range of care facilities and practice settings (e.g., teaching vs. nonteaching).
  
  
  RESULTS
  Of 13,830 patients, discontinuation of therapy was observed at 6-month follow-up in 8% of those taking aspirin on discharge, 12% of those taking beta-blockers, 20% of those taking ACE inhibitors, and 13% of those taking statins. In a multivariate analysis, adherence to beta-blocker therapy was higher in patients with a myocardial infarction (odds ratio [OR] = 1.25; 95% confidence interval [CI]: 1.06 to 1.47), hypertension (OR = 1.33; 95% CI: 1.15 to 1.54), ST-segment elevation myocardial infarction (OR = 1.33; 95% CI: 1.11 to 1.61), or non-ST-segment elevation myocardial infarction (OR = 1.25; 95% CI: 1.08 to 1.45). Aspirin adherence was higher among patients cared for by cardiologists (OR = 1.45; 95% CI: 1.19 to 1.75; P <0.001) than among those cared for by nonspecialists. Male sex and prior heart failure were associated with improved adherence to ACE inhibitor therapy. Hypertension was associated with poorer adherence to statin therapy (OR = 0.85; 95% CI: 0.74 to 0.99; P = 0.04).
  
  
  CONCLUSIONS
  Among patients prescribed key evidence-based medications at discharge, 8% to 20% were no longer taking their medication after 6 months. The reasons for noncompliance are complex, and may be elucidated by future studies of medical and social determinants.
authors.affiliation: University of Michigan Cardiovascular Center, Ann Arbor, Michigan, USA.
authors.forename: Kim A
authors.initials: KA
authors.lastname: Eagle
authors.forename: Eva
authors.initials: E
authors.lastname: Kline-Rogers
authors.forename: Shaun G
authors.initials: SG
authors.lastname: Goodman
authors.forename: Enrique P
authors.initials: EP
authors.lastname: Gurfinkel
authors.forename: Alvaro
authors.initials: A
authors.lastname: Avezum
authors.forename: Marcus D
authors.initials: MD
authors.lastname: Flather
authors.forename: Christopher B
authors.initials: CB
authors.lastname: Granger
authors.forename: Steve
authors.initials: S
authors.lastname: Erickson
authors.forename: Kami
authors.initials: K
authors.lastname: White
authors.forename: Philippe Gabriel
authors.initials: PG
authors.lastname: Steg
mesh_terms: D000208:Acute Disease; D000319:Adrenergic beta-Antagonists / Q000627:therapeutic use; D000368:Aged; D000369:Aged, 80 and over; D000569:Americas / Q000453:epidemiology; D000806:Angiotensin-Converting Enzyme Inhibitors / Q000627:therapeutic use; D001241:Aspirin / Q000627:therapeutic use; D044362:Australasia; D003327:Coronary Disease / Q000188:drug therapy*; D005060:Europe / Q000453:epidemiology; D019317:Evidence-Based Medicine; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D019161:Hydroxymethylglutaryl-CoA Reductase Inhibitors / Q000627:therapeutic use; D008297:Male; D008875:Middle Aged; D009203:Myocardial Infarction / Q000188:drug therapy; D010349:Patient Compliance / Q000523:psychology; D010975:Platelet Aggregation Inhibitors / Q000627:therapeutic use; D011446:Prospective Studies; D013577:Syndrome; D016896:Treatment Outcome
chemical_list: D000319:Adrenergic beta-Antagonists; D000806:Angiotensin-Converting Enzyme Inhibitors; D019161:Hydroxymethylglutaryl-CoA Reductase Inhibitors; D010975:Platelet Aggregation Inhibitors; D001241:Aspirin