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目的 观察ＶＤＤ起搏器对房室传导阻滞后者的临床运用和工作模式。方法 ５例三度房室传导阻滞患者，采用锁骨下静脉穿刺法植入ＶＤＤ起搏器，并在植入后１周和３月分别做动态心电图（Ｈｏｌｔｅｒ）观察．结果 ５例患者均成功植入ＶＤＤ起搏器，起搏阈值０．６～０．８ｖ，Ａ波感知灵敏度０．３ｍｖ．Ｈｏｌｔｅｒ检查显示：ＶＤＤ起搏器的工作模式大多为ＶＡＴ，房室同步起搏率达９５％以上，偶尔在夜间，Ｐ波频率＜６０ｂｐｍ时起搏器工作模式自动转换成ＶＶＩ。结论 ＶＤＤ起搏器具有ＶＡＴ和ＶＶＩ双重功能，对房室传导阻滞患者能增加安全性和改善心脏功能。
Objective To observe the clinical application of VDD pacemaker to atrioventricular block and its working mode. Methods Five patients with third degree atrioventricular block were implanted with VDD pacemaker by subclavian vein puncture. Holter observation was performed at 1 week and 3 months after implantation. Results All 5 patients were successfully implanted with VDD pacemaker. The pacing threshold was 0.6 ~ 0.8v and the sensitivity of A wave was 0.3mv. The Holter test showed that the working mode of the VDD pacemaker was mostly VAT, and the atrial synchronization rate was over 95%. Occasionally, the pacemaker operating mode was automatically converted to VVI at night when the P wave frequency was <60bpm. Conclusion The VDD pacemaker has dual functions of VAT and VVI, which can increase safety and improve cardiac function in patients with atrioventricular block.