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Review Question - QID 210617

Antiarrhythmics Introduction QID: 210617 (M1.OMB.18.1)
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QID 210617 (Type "210617" in App Search)
A 76-year-old man is brought to the emergency department by his daughter because he has been feeling lightheaded and almost passed out during dinner. Furthermore, over the past few days he has been experiencing heart palpitations. His medical history is significant for well-controlled hypertension and diabetes. Given this presentation, an electrocardiogram is performed showing an irregularly irregular tachyarrhythmia with narrow QRS complexes. The patient is prescribed a drug that decreases the slope of phase 0 of the ventricular action potential but does not change the overall duration of the action potential. Which of the following drugs is consistent with this mechanism of action?
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