The 73-year-old man of case 109 (who underwent addition of a separate pace-sense lead due to T-wave oversensing) receives a shock 1 month after system revision. He transmits ICD system information from home via the Carelink™ remote monitoring network. The stored episode is shown in Fig. 109.1. Based on your review of this tracing, what is your diagnosis? How do you counsel the patient? Should he present immediately, follow up in 2-3 days, or in 2-3 months?
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