An<unk>  (or AV<unk>  is a type of heart<unk>  involving an impairment of the conduction between the atria and ventricles of the heart.  It usually involves the<unk>  node, but it can involve other structures too.
Atrioventricular block
Atrioventricular dissociation
Left bundle branch block
Right bundle branch block
Sinoatrial block
Supraventricular arrhythmias
Third degree AV block
Second degree AV block