对64例持续频发性室性早搏患者，用随机单盲法，分别给口服室安卡因1200mg/日及1800mg/日，慢心律450mg/日及800mg/日，以观察对室性早搏的疗效。结果有效率分别为88％、72％、60％、40％。在两种药物的不同剂量组之间疗效无明显差别（p＞0.05），而在两药之间则差别明显：室安卡因79％、慢心律50％（P＜0.05）。 64 cases of patients with persistent premature ventricular contractions, randomized single-blind method, respectively, to the oral room ankines 1200mg / day and 1800mg / day, slow heart rate 450mg / day and 800mg / day to observe the premature ventricular contractions Efficacy. The results were 88% effective, 72%, 60%, 40%. There was no significant difference in the efficacy of different doses of the two drugs (p> 0.05), but there was a significant difference between the two drugs: 79% of room-ampicillin and 50% of slow heartbeat (P <0.05).