atrioventricular (AV) block

a·tri·o·ven·tric·u·lar (AV) block

(ā'trē-ō-ven-trik'yū-lăr blok)
Partial or complete block of electric impulses originating in the atrium or sinus node preventing them from reaching the atrioventricular node and ventricles. In first degree AV block, there is prolongation of AV conduction time (P-R interval); in second degree A-V block, some but not all atrial impulses fail to reach the ventricles, thus some ventricular beats are dropped; in complete AV block, complete atrioventricular dissociation (2) occurs; no impulses can reach the ventricles; atria and ventricles beat independently.
Synonym(s): block (4) .
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