AIM To observe the effects of pituitrin administrated intravenously on electrocardiogram(ECG), and the effects of taurine, diltiazem and their combination on the ECG changes induced by pituitrin in conscious unrestrained rats, and on experimental myocardial infarction in anaesthetized rats. METHODS ECG (leadII) was recorded and analyzed with Data Science International (DSI, USA). Cardiac infarction model was made by ligation of left anterior desending coronary artery and serum cardiac troponin I...