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Figure 1. Stored bipolar intracardiac electrograms obtained from a 66-year-old man with an implantable cardioverter-defibrillator were retrieved during a routine office visit. The patient had reported a brief episode of lightheadedness followed by a sudden jolt in his chest. He remained conscious. The intracardiac electrograms are recorded from a right ventricular rate-sensing lead. The initial rhythm is sinus, with characteristic intracardiac recordings analogous to the QRS complex and the T wave. Rapid ventricular tachycardia developed spontaneously and degenerated into ventricular fibrillation. The rapid ventricular rate was detected by the cardioverter-defibrillator, which delivered a high-energy DC shock. Defibrillation restored sinus . . . [Full Text of this Article] |
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