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The present study was canued out to clarify the relationship between silent myocardial ischemia in patients with angina pectoris and onset of myocardial infarction, and the former's prognostic significance. The peak incidences of onset of myocardial infarction in patients were at 2 a.m., 9 a.m., 2 p.m., 8 p.m., and 9 p.m., and the peak onsets of transient silent myocardial ischemia in angina pectoris patients were at 9 a.m., 2 p.m., 8 p.m., and 9 p.m. Thus the most likely onset times were almost the same with both events. Of 169 patients with coronary artery disease admitted for treatment, 128 patients had no anginal attacks during follow-up and the remaining 41 had persistent angina despite adequate medical treatment. Holter monitoring electrocardiography was performed twice with the non-angina patients, during admission. Of these 128 patients, 54 showed no silent myocardial ischemia on either of the electrocardiographic recordings, 34 showed silent ischemia with the first Holter monitoring but not with the second one, and the remaining 41 showed silent myocardial ischemia on both tests. The subsequent incidences of "cardiac events" were 9.4%, 14.7%, and 36.6%, respectively for these three groups. Therefore, it is concluded that the presence of silent myocardial ischemia is closely related to onset of myocardial infarction and is an important prognostic factor in patients with coronary artery disease.

Clinical significance and management of silent myocardial ischemia in patients with angina pectoris and myocardial infarction.