title: Wenckebach phenomenon in the bundle-branch system.
mesh_terms: D002037:Bundle-Branch Block / Q000503:physiopathology*; D004562:Electrocardiography; D006327:Heart Block / Q000503:physiopathology*; D006329:Heart Conduction System / Q000503:physiopathology; D006801:Humans; D008297:Male; D008875:Middle Aged