Review Question - QID 109209

A 50-year-old man with a past medical history of diabetes, hyperlipidemia, and uncontrolled hyperthyroidism presents to the hospital with crushing chest pain. He is found to have ST segment elevation and Q wave formation in the precordial and high lateral leads. He is treated for acute myocardial infarction and hospitalized. On the morning of his second day of hospitalization, he continues to be hemodynamically stable and asymptomatic but develops sustained monomorphic ventricular tachycardia. Which of the following best illustrates the cardiac action potential after administration of the antiarrhythmic drug most likely used for this patient?