Negative dromotropy is best described as which of the following?

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Multiple Choice

Negative dromotropy is best described as which of the following?

Explanation:
Negative dromotropy means slowing of conduction through the AV node. Parasympathetic (vagal) stimulation slows AV nodal conduction, mainly through acetylcholine acting on M2 receptors. This opens potassium channels and reduces calcium currents, lengthening the AV nodal delay and increasing refractoriness. This slowing helps prevent rapid transmission of atrial impulses to the ventricles. In contrast, sympathetic activation speeds AV nodal conduction (positive dromotropy) by enhancing calcium currents. So describing parasympathetic activation decreasing conduction velocity at the AV node is the correct interpretation.

Negative dromotropy means slowing of conduction through the AV node. Parasympathetic (vagal) stimulation slows AV nodal conduction, mainly through acetylcholine acting on M2 receptors. This opens potassium channels and reduces calcium currents, lengthening the AV nodal delay and increasing refractoriness. This slowing helps prevent rapid transmission of atrial impulses to the ventricles. In contrast, sympathetic activation speeds AV nodal conduction (positive dromotropy) by enhancing calcium currents. So describing parasympathetic activation decreasing conduction velocity at the AV node is the correct interpretation.

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