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Assessing the success of percutaneous transluminal coronary angioplasty.

Evaluation of the success of a therapeutic procedure should be related to the technical and clinical goals set for that procedure. For percutaneous transluminal coronary angioplasty the goal set depends on the clinical circumstances. For stable angina pectoris it is the elimination of exertional ischaemia; however in an elderly patient or a patient with severe associated non-cardiac disease, in whom coronary artery bypass surgery would be too hazardous, the goal may be limited to reducing the severity of angina pectoris to acceptable levels. There may also be a secondary goal of reducing the risk of subsequent major cardiac events, such as acute myocardial infarctions or improving prognosis. The intention in unstable angina is also to eliminate ischaemia but in some