EVALUATION OF CARDIAC RESPONSE TO EXERCISE IN CORONARY HEART DISEASE WITH ECHOCARDIOGRAPHY
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概要
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To assess the cardiac response and tolerance to exercise, cross-sectional echocardiography was performed before and during exercise on 30 healthy men and 28 patients with angina on effort. The cardiac response to exercise could be divided into 4 types according to parameters derived from short axis section echocardiogram. Type A: Left ventricular end-diastolic volume (LVEDV) increased slightly in the early stage of exercise, but both LVEDV and left ventricular end-systolic volume (LVESV) decreased gradually with exercise. Cardiac output was maintained by increase of myocardial contractility and heart rate. Type B: Initial response to exercise was similar to Type A, but thereafter the increased LVEDV and decreased LVESV remained unchanged until the late stage of exercise. Cardiac output was maintained with an increase of stroke volume. Type C: LVEDV, LVESV and contractility remained virtually unchanged throughout exercise. Type D: Contractility decreased from the early stage of exercise, and LVEDV and LVESV increased. Most young subjects showed Type A response, while in the healthy elder subjects the Type B response was more frequent. Anginal cases tolerating 100-125 watts responded as Type B or C. Most of them had single-vessel disaease. Patients tolerating only 50-75 watts showed Type C or D. They displayed multi-vessel disease and also high LVEDP. Patients with Type B response had adequate collateral circulation. Those of Type A who complained of chest pain were diagnosed to hove no coronary disease. It was found useful to classify the cardiac responses to predict the severity of the coronary heart disease.
- 名古屋市立大学の論文
- 1984-10-29