Fig. 4From: Reiterative ventricular fibrillation caused by R-on-T during temporary epicardial pacing: a case reportECG and pressure waveform during the second episode of ventricular fibrillation. This ECG also shows the R-on-T phenomenon resulting from undersensing of a PVC. A pacing spike hit the T wave (large arrow) following a PVC (small arrow) in this episode, as wellBack to article page