A patient with supraventricular tachycardia is prescribed a beta-blocker. Which of the following physiological effects is primarily responsible for its antiarrhythmic action in this scenario?
✓ Correct Answer: Option B
Beta-blockers reduce heart rate and decrease conduction velocity through the AV node by blocking beta-1 receptors. This action prolongs the refractory period, making it effective in controlling supraventricular tachycardias.
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