生理性起搏概念.ppt

双腔频率滞后伴有哪些信誉好的足球投注网站 主动有哪些信誉好的足球投注网站，每5分钟将基本频率间期降为滞后频率间期，鼓励自身窦律出现，有自身窦律，起搏器以滞后间期工作，没有自身窦律，恢复基础频率。 尽可能多的给自身窦律出现的机会，减少AP的起搏比例。 鼓励自身心律-窦房结优先（ST.JUDE） * 滞后伴有哪些信誉好的足球投注网站运作图解 ApVp ApVp ApVp AsVp AsVp 5min ApVp/ AsVp ApVp ApVp 举例值: 5min 1个周期数 窦房结优先 在传感器频率起搏时，若窦性激动频率一直不能增快并超过传感器频率，起搏器将开启一个有哪些信誉好的足球投注网站间期，在此间期内，起搏频率逐渐下降，直至窦性频率出现，当窦性激动的频率持续（8次心跳）低于窦性优先区下限，起搏器将逐渐提高起搏器频率直至传感器频率。 窦房结优先 若窦性激动的频率增快并超过传感器频率，则窦性跟踪开始，当窦性激动的频率持续（8次心跳）低于窦性优先区的下限，起搏器将逐渐提高起搏器频率直传感器频率。 1、传统的生理起搏概念是保持房室顺序收缩和具有频率应答功能。 2、现代概念除上述外主要是： ①改善起搏部位，减少对心功能的影响； ②通过多部位起搏同步化治疗改善心室内、心室间的同步性，减少自身异常的传导激动； ③鼓励正常的自身激动，减少心室起搏比例。 小 结 Thanks Thanks Thanks Thanks Thanks Thanks Thanks Thanks Thanks Thanks Thanks Thanks Thanks * 因此我们人工心脏起搏就是模拟我们正常心脏的冲动形成及传导顺序，帮助需要起搏支持的心脏重建。。。。。 愿望是非常美好的，现实是如何呢？ * 因此，传统----，包括AAI/R 及DDD/R Electrical: Inter- and/or intraventricular conduction delay usually manifested as left bundle branch block Structural: disruption of myocardial collagen matrix impairing electrical conduction and mechanical efficiency Mechanical: Regional wall motion abnormalities with increased workload and stress—compromising ventricular mechanics Cardiac Resynchronization Therapeutic intent of atrial synchronized biventricular pacing Through the modification of interventricular, intraventricular, and atrial-ventricular activation sequences In patients with ventricular dysynchrony Ventricular dysynchrony is defined as the effect caused by intra and inter-ventricular conduction defects or bundle branch block. Read Dr. Tavazzi’s editorial referenced here for a summary of the three potential causes of ventricular dyssynchrony. Interventricular dysynchrony is delay in the LV as compared to the RV. Intraventricular dysynchrony is delay in the lateral free wall as compared to the septum. Cardiac resynchronization is defined as the therapeutic intent of atrial synchronized biventricular pacing for patients with heart failure and ventricular dysynchrony. The intent of the therapy is to resynchro