Positive dromotropy refers to a change in conduction velocity in response to autonomic activity. Which statement is correct?

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Multiple Choice

Positive dromotropy refers to a change in conduction velocity in response to autonomic activity. Which statement is correct?

Explanation:
Positive dromotropy is faster conduction through the AV node in response to autonomic activity. Sympathetic activation speeds AV nodal conduction by increasing calcium channel activity and the depolarization rate, which shortens the PR interval on the ECG. This makes the statement that conduction velocity increases with sympathetic activation correct. Conversely, parasympathetic (vagal) activation slows AV nodal conduction, illustrating negative dromotropy, and choices suggesting a decrease in conduction with sympathetic activity or no effect do not fit.

Positive dromotropy is faster conduction through the AV node in response to autonomic activity. Sympathetic activation speeds AV nodal conduction by increasing calcium channel activity and the depolarization rate, which shortens the PR interval on the ECG. This makes the statement that conduction velocity increases with sympathetic activation correct. Conversely, parasympathetic (vagal) activation slows AV nodal conduction, illustrating negative dromotropy, and choices suggesting a decrease in conduction with sympathetic activity or no effect do not fit.

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