[Transitory changes in the ST interval of ischemic heart disease patients with stenocardia during 24-hour ECG...

Five hundred and seventy coronary patients of both sexes, showing occasional attacks of angina of effort, were subjected to 24-hour ECG monitoring sessions at 1 week intervals during 1 month. Ischemic episodes were detected in 139 (24%) patients. A total of 362 ischemic episodes were already detected at the first ECG monitoring session, the majority of those (97%) being painless. Magnitude and duration of ST depression were similar in the absence of pain and during anginal attacks. Repeated sessions demonstrated considerable spontaneous variability in the frequency of ischemic episodes.