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Implantable cardioverter-defibrillator (ICD) data showing an episode of ventricular fibrillation terminated by a 21 J shock delivered by the device. Intracardiac electrograms are recorded from the right atrium (A) and right ventricle (V) along with a surface ECG. Sensed intracardiac intervals are shown at the bottom of the figure. Following cardioversion, ventricular fibrillation is terminated and bradycardia is seen requiring atrioventricular pacing.
