Significance of silent myocardial ischemia after coronary artery bypass surgery.

Am J Cardiol. 1992 Nov 16;70(16):35F-38F. doi: 10.1016/0002-9149(92)90187-4.

Significance of silent myocardial ischemia after coronary artery bypass surgery.

The American journal of cardiology

Evans Memorial Department of Clinical Research, University Hospital, Boston, Massachusetts 02118.

PMID: 1442600 DOI: 10.1016/0002-9149(92)90187-4

Abstract

The prevalence and prognostic significance of transient myocardial ischemia after coronary artery bypass grafting (CABG) were evaluated. In 3 studies, ischemia was found in an average of 24% of patients by ambulatory electrocardiographic monitoring at 3-12 months after CABG. An average of 36% of patients in 3 other studies experienced ischemic ST-segment depression during exercise testing at 4-50 months after CABG. Of the ischemic episodes, 77% were silent during exercise testing. In the Coronary Artery Surgery Study (CASS) randomized patient subsets, survival at 12 years was significantly lower for patients who had either silent or symptomatic ischemia during exercise testing at 6 months after CABG compared with those who had no ischemia.

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