Effectiveness of beta-blocker therapy after acute myocardial infarction in elderly patients with chronic obstructive pulmonary disease or asthma.

OBJECTIVES We evaluated the use and effectiveness of beta-blocker therapy after acute myocardial infarction (AMI) for elderly patients with chronic obstructive pulmonary disease (COPD) or asthma. BACKGROUND Because patients with COPD and asthma have largely been excluded from clinical trials of beta-blocker therapy for AMI, the extent to which these patients would benefit from beta-blocker therapy after AMI is not well defined. METHODS Using data from the Cooperative Cardiovascular Project, we examined the relationship between discharge use of beta-blockers and one-year mortality in patients with COPD or asthma who were not using beta-agonists, patients with COPD or asthma who were concurrently using beta-agonists and patients with evidence of severe disease (use of prednisone or previous hospitalization for COPD or asthma) compared with patients without COPD or asthma. RESULTS Of 54,962 patients without contraindications to beta-blockers, patients with COPD or asthma (20%) were significantly less likely to be prescribed beta-blockers at discharge after AMI. After adjusting for demographic and clinical factors, we found that beta-blockers were associated with lower one-year mortality in patients with COPD or asthma who were not on beta-agonist therapy (relative risk [RR] = 0.85, 95% confidence interval [CI] 0.73 to 1.00), similar to patients without COPD or asthma (RR = 0.86, 95% CI 0.81 to 0.92). A survival benefit for beta-blockers was not found among patients concurrently using beta-agonists or with severe COPD or asthma. CONCLUSIONS Beta-blocker therapy after AMI may be beneficial for COPD or asthma patients with mild disease. A survival benefit was not found for elderly AMI patients with more severe pulmonary disease.