Clinical Research Directory

Inclusion Criteria: * Age 19 years or older * Symptomatic angina patients with objective myocardial ischemia * Patients with at least one major epicardial coronary artery that requires stent implantation * Subject who signs with informed consent form Patient exclusion Criteria: * ST-segment elevation MI at admission * Patients who underwent coronary artery bypass surgery or heart transplantation * Left ventricular ejection fraction \<30% * Cardiogenic shock * Patients whose life expectancy \<2 years * Woman who are breastfeeding, pregnant or planning to become pregnant during study * Patients in whom anti-platelets or heparin is contraindicated Lesion exclusion Criteria: * Left main culprit lesion (angiographic diameter stenosis \>50%) * Thrombus-containing lesion * In-stent restenosis * Side branch lesion * Chronic total occlusion * Small vessel with reference diameter \<2.5mm * Coronary spasm despite administration of nitrate * Inability for imaging catheter to pass through tight stenosis, calcification, angulations * Poor image quality * Angiographically visible collateral vessels