title: Automaticity of the Kent bundle: confirmation by phase 3 and phase 4 block.
abstract: Automaticity in the Kent anomalous atrioventricular bundle has been postulated to occur on the basis of electrocardiographic recordings. This hypothesis was confirmed using intracardiac recordings and programmed stimulation in a patient with pre-excitation. It was supported, in part, by demonstrating the presence of phase 3 and phase 4 block in the Kent bundle during decremental atrial pacing. The existence of automaticity in the Kent bundle may explain the manifestation of intermittent pre-excitation in certain patients. Furthermore, the presence of phase 3 and phase 4 block makes the likelihood of rapid antidromic conduction over the Kent bundle pathway unlikely within this subgroup.
mesh_terms: D001281:Atrial Fibrillation / Q000503:physiopathology; D001283:Atrioventricular Node / Q000002:abnormalities* / Q000503:physiopathology; D004594:Electrophysiology; D006327:Heart Block / Q000503:physiopathology*; D006329:Heart Conduction System / Q000002:abnormalities*; D006801:Humans; D008297:Male; D008875:Middle Aged; D012849:Sinoatrial Node / Q000503:physiopathology; D013610:Tachycardia / Q000503:physiopathology; D013997:Time Factors