title: [Unusual forms of branch block: phasic intermittent block of 2nd degree 2:1 and Wenkeback type in the bundle of His].
mesh_terms: D000293:Adolescent; D000368:Aged; D002037:Bundle-Branch Block / Q000175:diagnosis* / Q000503:physiopathology; D004562:Electrocardiography; D005260:Female; D006329:Heart Conduction System / Q000503:physiopathology; D006339:Heart Rate; D006801:Humans; D008297:Male; D008875:Middle Aged; D014636:Valsalva Maneuver
vernacular_title: Formas inusuales de presentación de los bloqueos de rama: bloqueo intermitente fásico de segundo grado 2:1 y tipo Wenkebach en las ramas del haz de His.