Final answer:
The two AV junctional problems include the first-degree AV block, indicated by a prolonged PR interval on an ECG, and the third-degree AV block, where P waves and QRS complexes occur independently of each other.
Step-by-step explanation:
The AV junctional problems refer to disrupts in cardiac conduction primarily at the atrioventricular node. Two common AV junctional problems are the first-degree AV block and the third-degree AV block. A first-degree AV block presents as a prolonged PR interval on an electrocardiogram (ECG), indicating a delay in the conduction between the sinoatrial (SA) node and the AV node.
On the other hand, a third-degree AV block features a complete disassociation between atrial and ventricular activities; the P waves and QRS complexes occur independently of each other on an ECG. While the AV node can act as a pacemaker in the event of total SA node failure, generating 40-60 beats per minute, third-degree blocks are severe and can compromise cardiac output and require immediate medical attention.