53 years old woman, implanted with a triple chamber defibrillator Protecta XT CRT-D for ischemic cardiomyopathy with left bundle branch block ; Routine follow-up
Temporary programming ODO ;
In this patient, oversensing of the T wave was present after a spontaneous ventricular event but also after a paced ventricular event. However, it was not responsible for a significant drop in the percentage of biventricular pacing. The device recorded a large number of premature ventricular contractions corresponding to the T-wave oversensing episodes.
Oversensing of the T wave promotes the absence of biventricular pacing. The T wave is considered as ventricular premature contraction, which causes a prolongation of the PVARP if the “response to a VPB” algorythm is turned ON. The next sinus P-wave fall into the PVARP, and therefore don’t trigger a new AVD, and the phenomenon perpetuates as shown in the previous case.
