Dromotropic Agent - Effect

• A. Increases conduction velocity of the ventricles
• B. Slows conduction through the AV node
• C. Increases atrial conduction
• D. Effects the conduction speed of the AV Node, and subsequently the rate of electrical impulses in the heart

Answer: (D)

Dromotropic refers to the speed of conduction through the AV node. An agent with a dromotropic effect changes how quickly the impulse travels from the atria to the ventricles, thereby altering the heart rate. The statement that it affects the conduction speed of the AV node and, consequently, the rate of electrical impulses in the heart captures this mechanism directly. The other ideas point to conduction in areas that aren’t the primary focus of dromotropic effects (ventricles or atria) or specify a direction without tying it to AV nodal conduction. So the concept centers on AV nodal conduction and the downstream impact on heart rate.