心脏起搏对心脏泵血功能的影响

HEMODYNAMIC BENEFITS OF CARDIAC PACING FOR CARDIAC FUNCTION IN PUMPING BLOOD

本文对32例接受永久性心脏起搏器治疗患者进行了血液动力学研究。在PR间期于100～200ms的生理范围内,非同步心室收缩(心室心律,心室起搏)的心输出量较之房室同步收缩(正常窦性心律、心房起搏及房室同步起搏)的心输出量低14～17%。生理性起搏能提高心输出量,因其保留心房泵血机制,这对心脏病患者是重要的。70次/分的起搏可以满足静息状态下的生理需要,太快的起搏对患者无血液动力学益处。

The hemodynamic benefits were studied in 32 patients who had implanted permanent pacemaker. Cardiac output of asynchronous ventricular contractions (idioventricular rhythm, ventricular pacing) was lowered by 14 to 17% than sychronized A-V contractions (normal sinus heart rate, atrial sychronized pacing, and sychronized A-V pacing) when the P-R interval was in the physiologic range of approximately 100 to 200 msec. Physiological pacing can increase cardiac output because it can retain 'booter pump' mechanizing of the atria which is important for Patients with heart disease. Pacing of 70 bpm can meet the physiologic need at rest. There is no hymodynamic benefit for patients to pace too fast.