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众所周知,心脏具有精细而协调的电和机械收缩功能,具体表现在频率的可变性和房室顺序收缩的同步性。生理学证实:心输出量(co)=心率(HR)×每搏量(SV)。运动时,通过增加HR和SV,即可增加心输出量。就一般人而言,HR的增加比SV的增加更明显(2:1)。当心肌收缩力减退时,只能通过HR的增加来获得较佳的血流动力学效应。频率应答式起搏(RRP)即是基于这个原理。它较心室按需起搏(VVI)获得较好的血流动力学效应,提高机体的运动耐量和较高的生活质量。根据核素心室造影证实,增加起搏频率,增加心输出量是肯定的。
As we all know, the heart has a fine and coordinated electrical and mechanical contractility, manifested in the frequency of variability and atrioventricular synchrony contraction. Physiological evidence: cardiac output (co) = heart rate (HR) × stroke volume (SV). Exercise, by increasing the HR and SV, can increase cardiac output. For the average person, the increase in HR is more pronounced than the increase in SV (2: 1). When myocardial contractility decreased, only through the increase of HR to obtain better hemodynamic effects. Frequency response pacing (RRP) is based on this principle. It is better than the ventricular pacing (VVI) hemodynamic response to improve the body’s exercise tolerance and high quality of life. According to the radionuclide ventriculography confirmed that increasing pacing frequency and increase cardiac output is positive.