A 76 year-old man with prior inferior wall myocardial infarction (NYHA Class II, left-ventricular ejection fraction 41%, first degree AV block, and narrow QRS) underwent implantation of a dual-chamber ICD (Medtronic EnTrust™ D154ATG) for sustained monomorphic VT requiring cardioversion. He was treated with sotalol 120 mg q 12 h to reduce the frequency of VT. Figure 120.1 shows an episode retrieved from the ICD's SVT log with programmed detection and bradycardia pacing parameters. Why is VT misdiagnosed as sinus tachycardia?
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