24th April 2024

You are on a ward round with your cardiology consultant and two medical students.

You are on a ward round with your cardiology consultant and two medical students. The consultant quizzes the medical students on different classes of antiarrhythmic medications. Unfortunately, they have returned from a long summer break and forgot this information, so the question comes to you to answer. According to the Vaughan-Williams classification, which of the following medications primarily acts by blocking potassium channels and prolongs the action potential duration? 

Select the SINGLE most appropriate option from the list below. Select ONE option only.