This is called 2:1 AV block, as depicted below: When 2:1 AV block is present, the rhythm may be second-degree type I or second-degree type II AV block. Exercising the patient will increase AV ...

Third-degree atrioventricular nodal block, also known as third-degree heart block or complete heart block, occurs when no action potentials conduct through the AV node. This results in the P waves ...