一、生理性起搏心室按需起搏(ⅤⅥ)与固定频率起搏相比较,只是不会引起自身心律与起搏刺激的相互竞争,它的起搏频率仍然固定不变,而不能随机体代谢的情况进行调整,也不能保持正常的房室顺序收缩,是非生理性的起搏方法,因而对心功能低下,心肌顺应性差及对体力负荷要求高的病人并不理想。少数病人应用一般的心室按需起搏还可发生“起搏综合症”。通过双腔起搏方式保持房室顺序收缩,或利用 First, physiological pacemaker ventricular on-demand pacing (Ⅴ Ⅵ) compared with fixed-frequency pacing, but will not cause their own rhythms and pacing stimulus competition, its pace of pacing is still fixed, but can not be randomized Metabolic adjustment, can not maintain the normal sequence of atrioventricular contraction, non-physiological pacing method, and therefore poor heart function, poor myocardial compliance and physical exertion in patients with high demand is not ideal. A small number of patients with general ventricular demand pacing can occur “pacing syndrome.” By dual-chamber pacing to maintain atrioventricular order contraction, or use