High grade AV block

High-grade AV block, also known as advanced heart block, is a form of third-degree heart block. This occurs when AV dissociation is present; however, intermittently some sinus node action potentials (P waves) are randomly conducted to the ventricles. This is different than “complete heart block," another form of third degree heart block, where no sinus node activity conducts through the AV node to the ventricles at all.

Treatment of high-grade AV block is permanent pacemaker implantation.