A 67-year-old man received a Guidant 1850 single chamber defibrillator on an Endotak™ right ventricular lead for sudden death prevention in the setting of an ischemic cardiomyopathy. He was using an auger when he received a shock without antecedent symptoms. The ICD is interrogated and the episode electrograms shown in Fig. 114.1. Lead impedance values were normal. What is your diagnosis, and management plan?
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