Implantable cardioverter-defibrillator (ICD) electrogram shock for ventricular fibrillation (VF)

Stored intracardiac electrogram from an ICD showing the development of ventricular fibrillation, which is successfully terminated by a single shock from the ICD.

RA: right atrium; RV: right ventricle; AS: atrium sensed; AP: atrium paced; A pacing: atrial pacing; VF: ventricular fibrillation; PVC: premature ventricular contraction; VPB: ventricular premature beats.

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