Evaluation of Preoperative Angiography
Coronary angiography was performed using a standard femoral or radial artery approach with a 5Fr or 6Fr diagnostic catheter. After administration of 200μg of intracoronary nitroglycerin, angiography was performed to allow for the best possible visualization of the stenosis. A visual estimation of the maximal degree of anatomic stenosis was performed by 2 independent cardiologists. The degree of coronary artery stenosis was categorized as intermediate (diameter stenosis ≥70% but <90%) or severe (≥90% stenosis).