Secondary Protective effect of ca-antagonist for ischemic heart attack randominzed parallel comparison with beta-blocker trial

INTERVENTION: atenolol‐treated group dose: 50 mg QD maximum dose: 100mg Permission to change the dose according to age or symptoms. benidipine‐treated group dose: 4mg BID Permission to change the dose according to age or symptoms. vasospastic angina patient group benidipine dose: 4mg BID Permission to change the dose according to age or symptoms. CONDITION: Ischemic heart disease (post‐myocardila infarction angina, angina pectoris) PRIMARY OUTCOME: cardiovascular evetns including myocardial infarction, angina, silent myocardial ischemia, taget lesion revascularization, cerebral infarction, intracerebral hemorrhage SECONDARY OUTCOME: 1. all death; 2. hospitalization due to heart failure etc; 3. renal failure (hemodialysis) INCLUSION CRITERIA: 1. post‐myocardial angina healed myocardial infarction or >1 month after acute myocardial infarction under stable conditions 2. angina pectoris >=1mm ST deviation on chest pain was observed and coronary angiography within 6 months revealed 75%<= stenosis Vasospasm Acetylcholineor ergonobin induced vasospasm, catheter‐induced vasospasm, or 1mm<= ST elevation on chest pain