angiographic findings in 30 patients with symptoms of angina were progression of the coronary artery disease in 22 , ( 73 % , confidence limits 56 % to 91 % ) , occluded or stenosed grafts in nine ( 30 % , confidence limits 12 % to 48 % ) , and nonbypassed obstructions in six patients ( 20 % , confidence limits 4 % to 36 % ) .
C1947917
occluded
C0028778
obstructions