Improved adherence to certain medications associated with longer survival following heart attack

New research suggests that the pharmacological effects of taking medications such as statins and beta-blockers as prescribed following a heart attack is associated with living longer, according to a study in the January 10 issue of JAMA.

Clinical trials have demonstrated that selected medications reduce the risk of cardiovascular death. However, their projected survival impact in the real world is less known, in part because of variations in drug adherence, according to background information in the article. Although it is known that adherence to evidence-based medications predicts better survival, no population outcome study has attempted to differentiate whether these associations are attributable to the drug's biological responsiveness (drug effect) or to the adoption of healthier lifestyles that often accompany adherent behaviors (healthy adherer effect).

Jeppe N. Rasmussen, M.D., of the University of Toronto, and colleagues examined the relationship between drug adherence and death following acute myocardial infarction (AMI; heart attack). To help evaluate whether this relationship was more attributable to drug effects rather than to healthy adherer effects, the researchers examined 3 medication classes, 2 of which are associated with proven mortality benefits (statins and beta-blockers); the third medication class (calcium channel blockers) was examined as a control given the absence of documented post-heart attack survival advantages. The study included 31,455 elderly heart attack survivors between 1999 and 2003 in Ontario. All patients filled a prescription for statins, beta-blockers, or calcium channel blockers. Patient adherence was subdivided into 3 categories: high (proportion of days covered, 80 percent or greater), intermediate (proportion of days covered, 40 percent - 79 percent), and low (proportion of days covered, less than 40 percent).

Among patients who used statins, mortality was greatest for low adherers (deaths

Contact: Julie Dowdie
JAMA and Archives Journals

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