Certified Cardiographic Technician (CCT) Practice Exam 2025 - Free CCT Practice Questions and Study Guide

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Which of the following medications block vagus nerve effects on the heart?

Atropine

Atropine is a medication that acts as an antimuscarinic agent, specifically blocking the effects of the vagus nerve on the heart. The vagus nerve, a part of the parasympathetic nervous system, normally slows down the heart rate through the release of acetylcholine. By blocking these vagal effects, atropine effectively increases heart rate and can be particularly useful in treating bradycardia or low heart rate conditions.

The other medications listed function differently. Digitalis increases contractility and can have a variable effect on heart rate but does not primarily block vagal effects. Epinephrine is a sympathomimetic agent that increases heart rate and contractility but does not directly block vagal actions. Verapamil is a calcium channel blocker that primarily affects the conduction system of the heart and is used to manage arrhythmias but does not block the vagus nerve's influence.

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Digitalis

Epinephrine

Verapamil

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