[Constriction of the left main coronary artery. Early and long term treatment outcome].

Clinical presentation and course were studies in 45 consecutive patients (p)--39 males, 6 females with angiographically proven left main coronary artery stenosis (LMCA) > 50%. Mean age was 54.7 years. Three (6%) had no history of chest pain, 2 p (4%) had atypical chest pain, and the remaining (90%) had typical angina pectoris. 19 p (42%) had unstable angina, 20 p (44%) had suffered a myocardial infarction in the past. Outside an episode of chest pain most of the patients had an abnormal ECG with ST-T segment depression 2 mm or more in leads V3-6 and ST-T elevation in leads V1 and aVR. No significant differences were found when the abnormalities of the ST-T segment were compared to severity of LMCA obstruction. A symptom limited exercise test was performed in 17 (37%) p. It was abnormal in 13 p (29%). Thirty eight patients (85%) underwent bypass surgery and the mean number of bypass graft was 3.3. Seven patients were treated medically. In the surgical group four p (10.5%) died perioperatively. All of them had subtotal occlusion of LMCA, without significant lesions in the remaining coronary arteries, the ejection fraction (EF) was above 66%. Among thirty four living patients thirty have been asymptomatic. In the medically treated group 3 p (42%) died and only two of four survivors were asymptomatic at a mean follow-up 35.7 months. Left ventricle of all died patients were severely damaged (EF mean 28%), right coronary artery (RCA) was totally occluded and all had rythm disturbances. We conclude, that patients with significant LMCA stenosis had a good prognosis when treated surgically.(ABSTRACT TRUNCATED AT 250 WORDS)