Plot

1. alternation of different frequencies ;
2. alternation between two ventricular cycles;

Tracing

3. biventricular stimulation ;
4. T-wave oversensing (TS) following a paced ventricular event;
5. this ventricular sensed event (TS) is considered as a premature ventricular contraction and trigger a prolongation of the PVARP; The next spontaneous atrial event fall in the PVARP (AR) and conduct a spontaneous QRS (VS) ;
6. late T-wave oversensing following the spontaneous ventricular event ; the next spontaneous atrial depolarization is even closer to this T-wave, and fall this time in the post ventricular atrial blanking, and is labeled Ab ;
7. as a consequence, The next spontaneous ventricule is detected in the fast VT via VF zone (TF.) ;
8. identical sequence ;
9. diagnosis of T-wave oversensing made by the device; therapies are withhold;

Text

10. diagnosis of T-wave oversensing made by the device;