Wenckebach periods in posterior inferior division of left bundle.
D002037:Bundle-Branch Block / Q000503:physiopathology; D004562:Electrocardiography; D006325:Heart Atria; D006327:Heart Block / Q000150:complications / Q000503:physiopathology* / Q000628:therapy; D006329:Heart Conduction System / Q000503:physiopathology*; D006801:Humans; D008297:Male; D008875:Middle Aged; D010138:Pacemaker, Artificial; D013575:Syncope / Q000209:etiology; D013997:Time Factors