title: Depression of distal AV conduction following ventricular pacing.
abstract: A 61-year-old man presented with symptomatic 2 degree Mobitz II AV block in association with bifascicular block. Ventricular pacing resulted in temporary depression of AV conduction. The extent of pacing-induced AV block varied directly with the duration and rate of ventricular pacing. Intracardiac recordings proved that the site of spontaneous and pacing-induced AV block was distal to the His bundle. Possible mechanisms by which this phenomenon may arise and several implications of practical importance are discussed.
mesh_terms: D002304:Cardiac Pacing, Artificial / Q000009:adverse effects*; D004562:Electrocardiography; D006327:Heart Block / Q000209:etiology*; D006329:Heart Conduction System / Q000503:physiopathology; D006801:Humans; D008297:Male; D008875:Middle Aged; D013997:Time Factors