During retrograde activation, if the signal passes through the AV node, the VA interval would ___ due to the decremental properties of the AV node.

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Multiple Choice

During retrograde activation, if the signal passes through the AV node, the VA interval would ___ due to the decremental properties of the AV node.

Explanation:
Decremental conduction in the AV node means its conduction time increases as the stimulation rate rises. When retrograde activation goes through the AV node, this slowing shows up as a longer delay from the ventricular event to the next atrial event—the VA interval lengthens with faster rates. So the VA interval would lengthen. If the impulse used a nondecremental pathway, the VA interval might be shorter and less rate-dependent, but through the AV node the increasing conduction time drives the lengthening.

Decremental conduction in the AV node means its conduction time increases as the stimulation rate rises. When retrograde activation goes through the AV node, this slowing shows up as a longer delay from the ventricular event to the next atrial event—the VA interval lengthens with faster rates. So the VA interval would lengthen. If the impulse used a nondecremental pathway, the VA interval might be shorter and less rate-dependent, but through the AV node the increasing conduction time drives the lengthening.

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