犬希氏束起搏的心脏电生理和血液动力学效应研究

Effect of cardiac pacing with a His bundle lead on cardiac electrophysiological and haemodynamical action in dogs

目的 :探讨希氏束起搏电极定位技术及心脏电生理和血液动力学变化特点。方法 :健康犬在全麻呼吸机通气下 ,开胸 ,将特制希氏束 (HisB)标测 /起搏电极进行HisB电位标测 ,确定HisB起搏位点 ;并将心室起搏电极固定于右室尖部分别构成HisB - VVI、RVA - VVI单腔心脏起搏 ,对比分析其心脏电生理和血液动力学参数变化。结果 :HisB起搏阈值参数符合心室起搏要求 ;HisB - VVI起搏QRS波较RVA - VVI起搏变窄 ;心输出量 (CO)较自身增加1 8.81 % ,RVA - VVI起搏反而降低约 5 .41 % ;每搏量 (SV)接近于自身窦性心律 ,但明显高于RVA - VVI起搏约 2 5 .59% ;左室每搏功 (LVSW )和右室每搏功 (RVSW)等参数亦明显优于RVA - VVI心脏起搏。结论 :HisB起搏由于将心室起搏位点从传统的右室尖改为His束 ,从而保持了近于正常生理性心室激动顺序和心室收缩同步性 ,故可维持整个心脏协调有序的收缩和舒张 ,产生优于RVA - VVI起搏的血液动力学效果。

AIM: To evaluate the effect of cardiac pacing with a His bundle lead on cardiac electrophysiological and haemodynamical action in dogs and the experience of location technique with His bundle pacing lead. METHODS: With opening chest operation in general-anesthetized dogs, a special lead was located at His bundle based on a typical 'H' wave and narrow duration of the QRS wave recorded in ECG; Platinum leads were fixed at the epicardium of the right ventricular apex (RVA) respectively, forming HisB- VVI pacing,RVA- VVI pacing. Cardiac electrophysiological and haemodynamical parameters were compared in sinus rhythm and the different pacing models. RESULTS: The threshold of HisB pacing is similar to that of RVA pacing. Cardiac output(CO)is increased about 18.81% in HisB- VVI pacing than self. It is decreased about 5.41% in RVA- VVI pacing. SV is similar to self,but it is 25.59% higher in HisB- VVI than RVA- VVI . LVSW and RVSW in His B- VVI pacing is superior to that in RVA- VVI . CONCLUSION: His bundle pacing significantly improves cardiac function compared with the RVA- VVI pacing because it can maintain normal physiological electronic activation sequence and systolic synchrony and have a better haemodynamics effect.neral-anesthetizeddogs,as