(Circulation. 1997;95:2037-2043.)
© 1997 American Heart Association, Inc.
Articles |
Asymptomatic Cardiac Ischemia Pilot (ACIP) Study Two-Year Follow-up
Outcomes of Patients Randomized to Initial Strategies of Medical Therapy Versus Revascularization
From the Division of Cardiology, Department of Medicine, University of Ottawa (Ontario) Heart Institute, and Ottawa Civic Hospital.
Correspondence to Dr Richard F. Davies, Room H147, University of Ottawa Heart Institute, 1053 Carling Ave, Ottawa, Ontario, Canada K1Y 4E9. E-mail rfdavies{at}heartinst.on.ca
Background Patients with ischemia during stress testing and ambulatory ECG monitoring have an increased risk of cardiac events, but it is not known whether their prognosis is improved by more aggressive treatment with anti-ischemic drugs or revascularization.
Methods and Results The Asymptomatic Cardiac Ischemia Pilot study randomized 558 such patients who had coronary anatomy suitable for revascularization to three treatment strategies: angina-guided drug therapy (n=183), angina plus ischemia–guided drug therapy (n=183), or revascularization by angioplasty or bypass surgery (n=192). Two years after randomization, the total mortality was 6.6% in the angina-guided strategy, 4.4% in the ischemia-guided strategy, and 1.1% in the revascularization strategy (P<.02). The rate of death or myocardial infarction was 12.1% in the angina-guided strategy, 8.8% in the ischemia-guided strategy, and 4.7% in the revascularization strategy (P<.04). The rate of death, myocardial infarction, or recurrent cardiac hospitalization was 41.8% in the angina-guided strategy, 38.5% in the ischemia-guided strategy, and 23.1% in the revascularization strategy (P<.001). Pairwise testing revealed significant differences between the revascularization and angina-guided strategies for each comparison.
Conclusions A strategy of initial revascularization appears to improve the prognosis of this population compared with angina-guided medical therapy. A larger long-term study is needed to confirm this benefit and to adequately test the potential of more aggressive drug therapy.
Key Words: prognosis • electrocardiography • coronary disease • revascularization • survival • drugs
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