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例1 男性,57岁。因Ⅲ度房室传导阻滞(A-VB)于1986年8月8日埋藏AXB-3型VVI起搏器。埋入前经起搏分析仪测试,各项指标均符合要求。术后3小时,起搏频率稳定于71次/分。3个月后,为了解起搏器的感知功能,进行胸壁刺激试验。采用FD-I型刺激仪,脉宽10ms,电压15V,当刺激频率为80次/分时,埋藏起搏器的频率也加快至80次/分,两种脉冲重迭,保持1∶1同步。停止胸壁刺激后,起搏器脉冲频率恢复到刺激前情况。再次用80次/分刺激,重复出现上述结果。将刺激频率提高到90次/分时,则起搏器不发放脉冲,同步现象消失。例2 男性,58岁。因Ⅲ度A-VB于1988年10月30日埋藏AXB-3型VVI起搏器,术前测试频率为
Example 1 male, 57 years old. The AXB-3 VVI pacemaker was buried on August 8, 1986 due to a third-degree atrioventricular block (A-VB). Buried before the pacing analyzer test, the indicators are in line with the requirements. Three hours after surgery, the pacing frequency stabilized at 71 beats / min. Three months later, in order to understand the perception of pacemaker function, chest wall stimulation test. Using FD-I stimulator, the pulse width of 10ms, voltage 15V, when the stimulation frequency of 80 beats / min, buried pacemaker frequency also accelerated to 80 beats / min, the two pulse overlap, maintaining 1: 1 synchronization . After stopping chest wall stimulation, the pacemaker pulse frequency returned to the pre-stimulation condition. Again with 80 beats / min stimulation, repeat the above results. The stimulation frequency increased to 90 beats / min, then the pacemaker does not issue pulses, the synchronization disappears. Example 2 male, 58 years old. Because Ⅲ A-VB buries the AXB-3 VVI pacemaker on October 30, 1988, the preoperative test frequency is