Efficacy and Safety of Salvianolate Injection in Elderly Patients With Unstable Angina Pectoris

inclusion criteria 1. Patient in line with 1979 WHO diagnostic criteria for UA 2. Ages eligible for study: 60-85years (adult,senior) 3. Traditional Chinese medicine for CHD treatment should be stopped at least 1 week;take CHD drugs standardly 4. Participates give written informed consent exclusion criteria 1. NSTE-ACS caused by non atherosclerotic disease 2. Angina pectoris caused by violent activities, fever, tachycardia, high adrenergic state, mental stress, lack of sleep, eating too full, left ventricular load increased (hypertension, aortic stenosis) 3. Angina pectoris caused byanemia, methemoglobinemia and hypoxemia 4. Abnormal thyroid function 5. Poorly controlled hypertension (systolic pressure ≥160mmHg or diastolic blood pressure ≥100mmHg) 6. Severe cardiopulmonary dysfunction 7. Severe arrhythmia (atrial fibrillation, atrial flutter, paroxysmal ventricular tachycardia, sinus bradycardia (heart rate \< 55),complete left bundle branch block 8. Combined liver and kidney and hematopoietic system and other serious diseases, liver function (ALT, AST) 3 times higher than the upper limit of normal renal function, creatinine clearance rate (CrCl) less than 30 ml/min/1.73m2 9. Recent 4 weeks underwent surgery and bleeding tendency 10. Poor compliance 11. At the same time in other clinical researches 12. Allergic constitution