Objective To evaluate the efficacy of intravenous injection of metoprolol and verapamil for paroxysmal supraventricular tachycardia(PSVT).

• 目的观察并比较静脉用美托洛尔与维拉帕米转复阵发性室上性心动过速(PSVT)的有效性及安全性。