Antedromic conduction in AVRT is characterized by?

Antedromic conduction in AVRT is characterized by?

• A. Down The AV Node And Up The Pathway
• B. Down The Accessory Pathway And Up The AV Node
• C. Only Within The AV Node
• D. From Ventricle To Atrium

Answer: (B)

Antedromic AVRT involves antegrade activation of the ventricles through the accessory pathway and retrograde activation of the atria via the AV node. In this tachycardia circuit, the impulse travels from the atria down the accessory pathway to the ventricles, then travels back up from the ventricles through the AV node to the atria, completing the loop. That description—down the accessory pathway and up the AV node—best captures the antegrade limb through the accessory pathway and the retrograde limb through the AV node. This contrasts with orthodromic AVRT, where the antegrade conduction goes through the AV node and the retrograde conduction uses the accessory pathway, described as down the AV node and up the pathway. The other options either describe conduction confined to the AV node or an activation direction that doesn’t form the reentrant circuit characteristic of antedromic AVRT.

Antedromic AVRT involves antegrade activation of the ventricles through the accessory pathway and retrograde activation of the atria via the AV node. In this tachycardia circuit, the impulse travels from the atria down the accessory pathway to the ventricles, then travels back up from the ventricles through the AV node to the atria, completing the loop. That description—down the accessory pathway and up the AV node—best captures the antegrade limb through the accessory pathway and the retrograde limb through the AV node.

This contrasts with orthodromic AVRT, where the antegrade conduction goes through the AV node and the retrograde conduction uses the accessory pathway, described as down the AV node and up the pathway. The other options either describe conduction confined to the AV node or an activation direction that doesn’t form the reentrant circuit characteristic of antedromic AVRT.