本文报告静脉美多心安成功治疗急性心肌梗塞(AMI)早期室颤等恶性室性心律失常(VA)一例,并就其作用机理等作一粗浅探讨。患者男,53岁,因突发心前区压榨性疼痛1小时就诊。查体:T 36℃,P 106次/分,R 24次/分,BP12/7kPa。神清,痛苦貌,大汗淋漓,烦躁。双肺呼吸音清晰,未闻罗音。心界不大,心音低钝,心率106次/分,可闻早搏5～6次/分,各瓣膜区未闻杂音。心电图示急性前 This article reports the successful treatment of intravenous metoprolol in the treatment of acute ventricular fibrillation (AMI) and other ventricular fibrillation and other malignant ventricular arrhythmia (VA) case, and its mechanism of action for a brief discussion. Male patient, 53 years old, due to sudden anterior precordial pain for 1 hour treatment. Examination: T 36 ℃, P 106 beats / min, R 24 beats / min, BP12 / 7kPa. Clear, painful, sweating, irritability. Breath sounds clear lungs, did not hear rales. Heart, blunt low heart rate, heart rate 106 beats / min, can be heard premature beats 5 to 6 beats / min, the valve area is not heard noise. ECG before acute