A 62-year-old woman with chronic atrial fibrillation is started on amiodarone for rate control. After 3 months of therapy, she develops tremor, ataxia, and cognitive slowing. Which of the following best explains the mechanism of this adverse effect?
A 55-year-old man with acute myocardial infarction complicated by recurrent ventricular ectopics is started on intravenous lidocaine. Which of the following best explains why lidocaine is preferred over quinidine in the acute post-MI setting?
A 68-year-old man with a history of dilated cardiomyopathy presents with sustained ventricular tachycardia. He is initiated on intravenous procainamide. Which of the following best explains the antiarrhythmic mechanism of procainamide in this patient?
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