title: Atrio-hisian fibers anatomy and electrophysiology.
abstract: BACKGROUND
  In this case, electrophysiology and histology could be studied in the same heart. Clinical investigation, clinical electrophysiology, and postmortem serial histological sections of the septum were analyzed.
  
  
  METHODS
  A patient with repeated seizures and a short PR interval with narrow QRS complex underwent electrophysiologic studies.
  
  
  RESULTS
  The patient died while experiencing a very rapid supraventricular tachycardia and histologic examination showed a atrio-hisian bypass tract.
  
  
  CONCLUSIONS
  In our study, the lack of lengthening of the PR interval in spite of progressively premature atrial stimulation connected with the presence of atrio-hisian bypass tract.
authors.affiliation: Department of Pathology, Louis Pasteur University, Strasbourg, France. Claudette.brechenmacher@orange.fr
authors.forename: Claude J
authors.initials: CJ
authors.lastname: Brechenmacher
mesh_terms: D002036:Bundle of His / Q000002:abnormalities / Q000473:pathology* / Q000503:physiopathology*; D002648:Child; D006325:Heart Atria / Q000002:abnormalities / Q000473:pathology* / Q000503:physiopathology*; D006329:Heart Conduction System / Q000002:abnormalities / Q000473:pathology* / Q000503:physiopathology*; D006801:Humans