title: [Fetal atrioventricular block].
abstract: OBJECTIVE
  To study the pathogenesis, evolution and prognosis of the complete heart block of the fetus.
  
  
  METHODS
  Bidimensional echocardiography associated to M-mode and doppler was performed in 600 patients. All cases of congenital heart block were referred because the fetuses presented hydrops, bradycardia and/or cardiac malformation suspected by routine ultrasound.
  
  
  RESULTS
  Isolated heart block was found in 6 fetuses (5 cases of complete type and 1 case of 2nd degree type 2:1). Heart block associated with complex cardiac disease and left atrial isomerism was found in 6 fetuses with no survivors (5 cases of complete type and 1 case of 2nd degree type 2:1). Heart block associated with atrioventricular discordante was found in 1 case.
  
  
  CONCLUSIONS
  The findings of this study agree the literature about the relation between maternal anti-RO antibodies and isolated complete heart block. We also found a poor prognosis in the group with heart block and complex cardiac malformations.
authors.affiliation: Departamento de Obstetrícia e Ginecologia, Hospital das Clínicas, FMUSP.
authors.forename: L M
authors.initials: LM
authors.lastname: Lopes
authors.forename: S C
authors.initials: SC
authors.lastname: Cha
authors.forename: L
authors.initials: L
authors.lastname: Sadek
authors.forename: E R
authors.initials: ER
authors.lastname: Iwahashi
authors.forename: V D
authors.initials: VD
authors.lastname: Aiello
authors.forename: M
authors.initials: M
authors.lastname: Zugaib
mesh_terms: D001938:Brazil / Q000453:epidemiology; D003240:Connective Tissue Diseases / Q000175:diagnosis / Q000453:epidemiology; D004452:Echocardiography / Q000295:instrumentation; D004562:Electrocardiography; D005260:Female; D005315:Fetal Diseases / Q000175:diagnosis* / Q000453:epidemiology; D006327:Heart Block / Q000175:diagnosis* / Q000453:epidemiology; D006801:Humans; D015994:Incidence; D007231:Infant, Newborn; D011247:Pregnancy; D011379:Prognosis; D016216:Ultrasonography, Prenatal / Q000295:instrumentation
vernacular_title: Bloqueio atrioventricular fetal.