DIAbetes and diffuse coronary Narrowing Analysis Study

INTERVENTION: Patients treated with voglibose (n=100) Patients treated with nateglinide (n=100) patients treated without medication, with diet and exercise (n=100) CONDITION: Patients with impaired fasting glucose or type‐2 diabetes mellitus, who had coronary artery diseases PRIMARY OUTCOME: Lesion length, vessel diameter, percentage diameter stenosis SECONDARY OUTCOME: MACE (all‐cause death, non‐fatal myocardial infarction, repeat revascularization, the occurrence of anginal chest pain), diabetic complication, the change of % diameter stenosis after PCI, the change of minimum lesional diameter after PCI, the occurrence of restenosis, the development of new stenotic lesion, the change of glycemic status INCLUSION CRITERIA: 1) patients who had organic stenosis in coronary angiography 2) patients who were diagnosed as impaired glucose tolerance or diabetes mellitus by a 75g‐OGTT