Silent myocardial ischemia during daily activities: studies in asymptomatic patients and those with various forms of angina.

Asymptomatic subjects with proven coronary artery disease, including those with no previous manifestations of coronary heart disease and those with previous myocardial infarction, have silent ischemic episodes during daily activity. Patients with all forms of angina, stable effort and unstable rest angina, and those with coronary artery spasm have very frequent episodes of silent myocardial ischemia during ordinary activity. Characteristics of these episodes and evidence for these findings are reviewed.