ATI Advanced Pharmacology Final Exam I | Nurselytic

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ATI Advanced Pharmacology Final Exam I Questions

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Question 1 of 5

What class of antiarrhythmic drugs blocks potassium channels prolonging phase 3 of the action potential and slowing the rate and conduction of the heart?

Correct Answer: C

Rationale: The correct answer is C: Class III. Class III antiarrhythmic drugs block potassium channels, which prolongs phase 3 of the action potential by delaying repolarization. This action results in a longer refractory period, slowing the heart rate and conduction. Option A (Class I) blocks sodium channels, option B (Class IV) blocks calcium channels, and option D (Class II) are beta-blockers that work by blocking beta-adrenergic receptors. These classes do not have a direct effect on potassium channels and do not produce the same effect as Class III drugs.

Question 2 of 5

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Question 3 of 5

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Question 5 of 5

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