Scenario: A 25-year-old man was referred from a cardiology clinic for an acute exacerbation of supraventricular tachycardia (SVT) during an exercise stress echocardiogram. He has a history of dilated cardiomyopathy (50% left ventricular ejection fraction [LVEF]), wall motion abnormalities, and long QT syndrome. In the clinic before admission, an SVT event was captured during an electrocardiogram (ECG) recording and resolved with a carotid sinus massage. The patient was fully conscious during the event. A few days later, he underwent an electrophysiology (EP) study with radio frequency ablation for atrioventricular reentrant tachycardia (AVRT). He was transferred to the cardiac step-down unit after the EP procedure, and his blood pressure was 94/56 mm Hg, heart rate 87/min, respiratory rate 21/min (regular), oxygen saturation 94% via room air, and body temperature 37 °C (99 °F). The 12-lead ECG below was taken 6 hours after admission to the unit.

Normal sinus rhythm, frequent...

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