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 ...

Note the irregular R-R intervals making 3rd degree heart block unlikely. The rhythm on this ECG needs to be distinguished from high grade AV block which is a form of 3rd degree AV block that can ...

The NHS says there are three stages of blockages: first, second and third degrees. The first is the least serious and you may not have symptoms. A second degree heart block sometimes causes ...