永久性心室起搏经常用单极阴极和双极埋藏式起搏器。临时起搏几乎均采用双极式。固定频率与心室自主节律发生竞争时,有诱发心室颤动的可能。这种危险性在急性心肌梗塞期间更大。使用按需式起搏器并非绝对安全。因为心脏自主搏动可能未被感知,使 Permanent ventricular pacing is often used monopolar cathode and bipolar buried pacemaker. Temporary pacing are almost bipolar. Fixed frequency and ventricular autonomic rhythm competition, there may be induced ventricular fibrillation. This risk is greater during acute myocardial infarction. Using an on-demand pacemaker is not absolutely safe. Because the heart’s own pulse may not be perceived, so