ABC | Volume 115, Nº1, Suplement, July 2020

Case Report Cruz et al. An Unusual Pacemaker-Induced Tachycardia Arq Bras Cardiol 2020; 115(1Suppl.1):14-17 Figure 3 – Representation of the pacing intervals of the pacemaker in DDD mode. A, atrial channel. Ap, atrial paced event. Ar, atrial event sensed in the refractory period. AVD, AV delay. LRL, lower rate limit. PVAB, post-ventricular atrial blanking. PVARP, post-ventricular atrial refractory period. TARP, total atrial refractory period. V, ventricular channel. VA interval, ventriculo-atrial interval. Vi, intrinsic ventricular event. Vp, ventricular paced event. Figure 4 – Reproduction of the intracardiac atrial and ventricular electrograms overlaying lead I of the surface ECG after reprogramming of the pacemaker. A, atrial channel. Ap, atrial paced event. V, ventricular channel. Vi, intrinsic ventricular event. 16