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 ...

If you have second-degree heart block, your cardiologist or healthcare provider may recommend making lifestyle changes to prevent it from worsening. Third-degree heart block is a medical emergency.