Effects of successful percutaneous transluminal coronary angioplasty on global and regional left ventricular function in unstable angina pectoris.

Sixty-eight patients (58 men, 10 women, mean age 56.3 years, range 31 to 72) with unstable angina pectoris, either initially stabilized with or refractory to optimal pharmacologic treatment, were studied to determine whether regional dysfunction due to stunning of the myocardium caused by attacks of chest pain at rest could be improved with percutaneous transluminal coronary angioplasty (PTCA). Patients were included in the study if they had successful 1-vessel PTCA, no angiographic restenosis, no reocclusion or late myocardial infarction and 2 serial left ventriculograms of sufficient quality to allow automated contour analysis before and after PTCA. Global ejection fraction increased significantly (from 56% to 60%, p less than 0.05) only after successful dilatation of a stenosis of the left anterior descending coronary artery. Analysis of regional wall displacement showed significant improvement of regional wall motion in the areas supplied by the dilated vessel of either the left anterior descending, the left circumflex or the right coronary artery. Thus, regional myocardial dysfunction due to stunning of the myocardium in patients with unstable angina improves after successful PTCA.