What Is the Primary Mechanism of Action of Class 4

question 33

Multiple Choice

What is the primary mechanism of action of Class 4 antiarrhythmic drugs?

• A) They block sodium channels.
• B) They block adrenergic beta-1 receptors.
• C) They block calcium channels in the sinoatrial (SA) and atrioventricular (AV) nodes.
• D) They block potassium channels.

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