title: Wolff-Parkinson-White syndrome with 1:2 atrioventricular conduction.
abstract: The QRS complex of the Wolff-Parkinson-White syndrome is thought to represent a fusion beat resulting from conduction over the normal pathway and an anomalous pathway. This report demonstrates utilization of both of these pathways resulting in two ventricular responses from a single supraventricular impulse. The presence of "1:2" atrioventricular conduction in this case firmly supports the fusion beat theory of the Wolff-Parkinson-White syndrome.
mesh_terms: D000328:Adult; D001283:Atrioventricular Node / Q000503:physiopathology; D002036:Bundle of His / Q000503:physiopathology; D006328:Cardiac Catheterization; D004562:Electrocardiography; D006329:Heart Conduction System / Q000503:physiopathology*; D006801:Humans; D008297:Male; D011433:Propranolol / Q000627:therapeutic use; D011802:Quinidine / Q000627:therapeutic use; D013610:Tachycardia / Q000175:diagnosis / Q000188:drug therapy; D014927:Wolff-Parkinson-White Syndrome / Q000503:physiopathology*
chemical_list: D011433:Propranolol; D011802:Quinidine