between 1972 and 1974 , 121 patients with chronic stable angina pectoris and operative coronary artery disease , excluding significant left main coronary obstruction , were randomized to either medical therapy ( 60 patients ) or surgical therapy ( 61 patients ) as part of a larger veterans administration cooperative study of surgery for coronary arterial occlusive disease .
C0028778
obstruction
C1947917
occlusive