title: [Evaluation of syncope in patients with chronic Chagas heart disease].
abstract: OBJECTIVE
  To evaluate causes of syncope in patients with Chagas' disease and intraventricular conduction disturbances.
  
  
  METHODS
  Nine patients have been studied, being seven males. Average of 49 years. The studied consisted of His Bundle electrogram, determination of Wenckebach period (WP), sinus node recovery time (SNRT), atrial stability and programmed ventricular stimulation (PVS).
  
  
  RESULTS
  Monomorphic ventricular tachycardia (VT) was induced in five patients (55.5%), WP depression was observed in three cases, H-V interval prolongation occurred in three cases and the SNRT was normal in hall patients. In one case the electrophysiological study was completely normal. Among five patients with induced VT, with a mean follow-up period of seven months, one died suddenly, three became asymptomatic with antiarrhythmic drugs and one went on a non pharmacological therapy. In the other four patients with a mean follow-up period of 21 months, three are asymptomatic and one presents occasional dizziness (patient with a normal study). Among the patients with VT four presented recurrent syncope while in the group of patients without VT (four patients) all had only one syncopal episode.
  
  
  CONCLUSIONS
  Patients with intraventricular disturbances, Chagas' disease and syncope, VT may be responsible for the symptoms in approximately 44% of cases. The PVS must be considered as a routine in the investigation of these patients.
authors.affiliation: Hospital Universitário Pedro Ernesto Universidade do Estado, Rio de Janeiro.
authors.forename: E C
authors.initials: EC
authors.lastname: Barbosa
authors.forename: F M
authors.initials: FM
authors.lastname: Albanesi Filho
authors.forename: P
authors.initials: P
authors.lastname: Ginefra
authors.forename: P J
authors.initials: PJ
authors.lastname: da Rocha
authors.forename: S H
authors.initials: SH
authors.lastname: Boghossian
authors.forename: N S
authors.initials: NS
authors.lastname: Musse
authors.forename: J B
authors.initials: JB
authors.lastname: Gomes Filho
mesh_terms: D000328:Adult; D000368:Aged; D002304:Cardiac Pacing, Artificial; D014355:Chagas Disease / Q000150:complications* / Q000503:physiopathology; D004594:Electrophysiology; D005260:Female; D005500:Follow-Up Studies; D006327:Heart Block / Q000150:complications* / Q000503:physiopathology; D006801:Humans; D008297:Male; D008875:Middle Aged; D013575:Syncope / Q000209:etiology*; D013610:Tachycardia / Q000150:complications* / Q000503:physiopathology
vernacular_title: Avaliação da síncope em pacientes com cardiopatia chagásica crônica.