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A 69-year-old man with a left-sided, dual-chamber implantable cardioverter defibrillator (ICD) (Atlas+V-243, Tendril 1688T atrial lead and Riata 7040 ventricular lead, St Jude Medical) implanted 7 years before he underwent a routine ICD follow-up visit in May 2014.
He reported one external direct-current electrical cardioversion (ECV) 1 month before for persistent symptomatic atrial fibrillation: one 360 J biphasic shock was delivered through a parasternal and a precordial paddle. Postprocedure ICD interrogation was not performed.
Previous device and lead parameters were unremarkable.
Figure 1A shows ICD battery status, pacing and antitachycardia parameters at the time of device interrogation.
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