Question 1: Where in the conduction system does the first PAC fail to conduct?
Question 2: Why does one of the PACs conduct while two PACs do not?
-Atrial premature complexes
-AV block, 1st degree
Question 1: AV Node.
Question 2: The conducted PAC falls outside of the refractory period of the AV node. The blocked PACs fall within the refractory period of the AV node.