title: Concealed Wenckebach phenomenon in a 3:1 atrioventricular block. Conduction disturbances within the His bundle.
mesh_terms: D002036:Bundle of His / Q000503:physiopathology*; D002304:Cardiac Pacing, Artificial; D004562:Electrocardiography; D005260:Female; D006327:Heart Block / Q000175:diagnosis*; D006329:Heart Conduction System / Q000503:physiopathology*; D006801:Humans; D008875:Middle Aged