Uncommon Ventricular Tachycardia Shocked by an ICD | Bordeaux Group Patient Case Quiz

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A patient recipient of a Virtuoso DR implantable cardioverter-defibrillator (ICD) is hospitalized for syncope and electrical shock. This 73-year-old man, who presented with a stable dilated cardiomyopathy (with narrow QRS complexes and left ventricular ejection fraction assessed at 31% by echocardiogram) and documented episodes of VT, undergoes implantation of a Virtuoso dual chamber ICD. He is seen in the cardiac emergency department after receiving an electrical shock. Note that the patient did present with syncope before the shock, which was clearly noticed by his spouse who was scared by her husband's symptoms.

Which of the following statements describes the type of arrhythmia that the ICD identifies for therapy delivery?

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