title: [Clinical and electrocardiographic characteristics of masquerading bifascicular block].
abstract: BACKGROUND
  Masquerading bundle branch block is a right bundle branch block with a left anterior hemiblock which appears similar to a left bundle branch block in the frontal plane leads.
  
  
  METHODS
  We have followed 22 patients with such a pattern in the electrocardiogram for 3 years.
  
  
  RESULTS
  Thirteen patients (59%) developed high degree atrioventricular block. During this period, there were 4 deaths, 3 from heart failure and 1 due to sepsis.
  
  
  CONCLUSIONS
  We conclude that progression to high degree atrioventricular block is quite common in the presence of this kind of branch block. It is frequently associated to advanced heart failure, so the prognosis is usually poor.
authors.affiliation: Unidad de Cardiología, Complejo Hospitalario Llerena-Zafra, Badajoz.
authors.forename: J J
authors.initials: JJ
authors.lastname: Gómez Barrado
authors.forename: S
authors.initials: S
authors.lastname: Turégano Albarrán
authors.forename: J C
authors.initials: JC
authors.lastname: García Rubira
authors.forename: R
authors.initials: R
authors.lastname: Hidalgo Urbano
authors.forename: M
authors.initials: M
authors.lastname: Pavón García
authors.forename: M
authors.initials: M
authors.lastname: Berjillos Cordón
authors.forename: J M
authors.initials: JM
authors.lastname: Cruz Fernández
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D002037:Bundle-Branch Block / Q000175:diagnosis*; D003937:Diagnosis, Differential; D004562:Electrocardiography; D005260:Female; D006327:Heart Block / Q000175:diagnosis*; D006801:Humans; D008297:Male; D008875:Middle Aged; D011379:Prognosis
vernacular_title: Características clínicas y electrocardiográficas del bloqueo bifascicular disfrazado.