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AICD detected PVCs prior to VF. PVCs (red arrows) can be seen on the ventricular electrogram (V). These PVCs supports the assumption that along with QTc prolongation, the PVCs could have resulted in the “R on T” phenomena, which triggered the VF. FF: far-field electrogram; AV: marker channel; V: ventricular electrogram; A: atrial electrogram; PVC: premature ventricular contraction.
