Definition Detection of a paced (VP) or sensed ventricular (VS) resets its clock an also initiates the ventricular refractory period (VRP) to prevent T-wave oversensing and initiates the post-ventricular atrial refractory period (PVARP) which helps prevent oversensing of retrograde P waves. VA interval (time from VP/VS to atrial firing) plus AVI (atrioventricular interval, roughly ~ […]