DXR Stent for Vascular Healing and Thrombus Formation: OCT Study

Inclusion Criteria: 1. Patient * Age \>=19 years * Clinically indicated to invasive coronary angiography * Patient capable and willing of giving written informed consent 2. Angiographic * coronary artery disease confined to native coronary artery * \>50% diameter stenosis by invasive coronary angiography * reference diameter 2.5-4.0mm, lesion length ≤30 mm Exclusion Criteria: 1. Patient * Inability to provide written informed consent * Serious comorbidity which may affect the trial by decision of investigators * Prior CABG to target vessel * Congestive heart failure with NYHA Class III or IV or left ventricular ejection fraction less than 30% * Prior ST elevation myocardial infarction within 72 hours from the procedure * Hemodynamic or electrical instability including shock * Serious coronary artery spasm, unrelated to catheter * Pregnancy or possible pregnant status * Allergy to iodinated contrast agent * Serum creatinine \>=1.7 mg/dL or creatinine clearance \<= 30 ml/min * ST elevation myocardial infarction 2. Angiographic (OCT) * Left main disease * Severely calcified lesion * Severely tortuous, or TIMI flow grade 0 or 1 by angiography, or inappropriate for OCT procedure by investigators' decision