CLINICAL STUDY: DIASTOLIC DYSFUNCTION
Effectiveness of beta-blocker therapy after acute myocardial infarction in elderly patients with chronic obstructive pulmonary disease or asthma
Jersey Chen, MD, MPH*,1,
Martha J. Radford, MD, FACC* ,
Yun Wang, MS ,
Thomas A. Marciniak, MD and
Harlan M. Krumholz, MD, FACC* ||
* Section of Cardiovascular Medicine, Department of Medicine, Yale University School of Medicine, New Haven, Connecticut, USA
Center for Outcomes Research and Evaluation, Yale-New Haven Hospital, New Haven, Connecticut, USA
Qualidigm, Middletown, Connecticut, USA
Health Care Financing Administration, Baltimore, Maryland, USA
|| Section of Health Policy and Administration, Department of Epidemiology and Public Health, Yale University School of Medicine, New Haven, Connecticut, USA
Manuscript received August 22, 2000;
revised manuscript received January 24, 2001,
accepted February 6, 2001.
Reprint requests and correspondence: Dr. Harlan M. Krumholz, 333 Cedar Street, P.O. Box 208025, New Haven, Connecticut 06520-8025 harlan.krumholz{at}yale.edu
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.
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Abbreviations and Acronyms
| | ACC | = American College of Cardiology | | AHA | = American Heart Association | | AMI | = acute myocardial infarction | | BHAT | = Beta-Blocker Heart Attack Trial | | CCP | = Cooperative Cardiovascular Project | | CI | = confidence interval | | CK | = creatine kinase | | COPD | = chronic obstructive pulmonary disease | | ICD-9-CM | = International Classification of Diseases, Ninth Revision, Clinical Modification | | LDH | = lactate dehydrogenase | | MIAMI | = Metoprolol In Acute Myocardial Infarction trial | | OR | = odds ratio | | RR | = relative risk |
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