All patients who have received GENOUS stent implantation at Queen Mary Hospital for treatment of ischemic heart disease are eligible for this study. Those with clinical indications to undergo restudy coronary angiogram or staged procedure PCI will be primarily recruited into this study. Optical coherence tomography (OCT) will be performed early after stent implantation to evaluate vascular healing response and neointimal coverage.
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Percentage stent coverage by OCT in early phases.
Timeframe: At 2nd, 3rd, 4th, 5th, and 6th weeks after stent implantation