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A 36-year-old man presents with the sensation of a racing heart. His blood pressure is 110/70, respiratory rate 14/min, and O2 saturation 98%. ECG is shown. Carotid massage and Valsalva maneuver do not improve the heart rate. Which of the following is the initial therapy of choice?
Adenosine 6-mg rapid IV bolus
Verapamil 2.5 to 5 mg IV over 1 to 2 minutes
Diltiazem 0.25-mg/kg IV over 2 minutes
Digoxin 0.5 mg IV slowly
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