atrioventricular block
AV block impairment of conduction of cardiac impulses from the atria to the ventricles, usually due to a block in the atrioventricular junctional tissue (atrioventricular node, bundle of His, or bundle branches). It is generally subclassified as first, second, or third degree atrioventricular block. Cf. heart b.
Medical dictionary.
2011.