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The Annals of Thoracic Surgery, Vol 26, 548-558, Copyright © 1978 by The Society of Thoracic Surgeons

ARTICLES

Acute effects of aortocoronary bypass surgery on left ventricular function and regional myocardial mechanics: a clinical study

S Hagl, H Meisner, W Heimisch and F Sebening

The acute effects of myocardial revascularization on overall left ventricular performance and on myocardial segmental wall motion were assessed intraoperatively in 22 patients who had unstable (11 patients) or stable angina pectoris (11 patients). Segmental contraction patterns were evaluated using an ultrasonic transit-time method. In 9 patients with unstable angina pectoris, notable improvement in segmental wall motion was observed as the short-term response to coronary bypass grafting. Hypokinetic patterns were rendered normal after revascularization. Despite marked changes in segmental myocardial function, overall left ventricular performance was not altered notably. In contrast, reperfusion did not lead to acute effects on either segmental wall motion or total left ventricular function in patients with stable angina pectoris. The results indicate that aortocoronary bypass grafting may improve segmental wall motion in patients with unstable angina.




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Copyright © 1978 by The Society of Thoracic Surgeons.