Sinus bradycardia and its variants - including sinoatrial block
Atrioventricular heart block or dissociation - can occur with sinus rhythm or atrial fibrillation or flutter
| Second or third degree AV block |
| Isorhythmic AV dissociation and related variants |
| Wandering atrial pacemaker |
| Junctional (AV nodal) escape rhythms - can occur with sinus rhythm or atrial fibrillation or flutter |
| Ventricular escape (idioventricular) rhythms |