title: [Daily and weekly circadian variations in sudden death in Chagas disease].
abstract: OBJECTIVE
  To determinate the circadian daily and weekly variations in the incidence of sudden death due to Chagas' disease.
  
  
  METHODS
  In 50 chronic chagasic individuals with sudden death due to Chagas' disease and in 473 individuals with natural, not sudden death, we analyzed both the day of the week and the time of the death. Statistical tests were applied to determine the significance of the difference between proportions and averages.
  
  
  RESULTS
  For the chagasic group the values indicated a highly significant excess of lethality for the period between 12 and 6pm. The occurrence of the sudden death was the same in the different days of the week for both groups.
  
  
  CONCLUSIONS
  The observed results suggest that the sudden death associated with Chagas' disease has a circadian pattern with a vespertine peak. Weekly variations in the sudden death of chronic chagasic individuals were not detected.
authors.affiliation: Faculdade de Medicina do Triângulo Mineiro, Uberaba.
authors.forename: E R
authors.initials: ER
authors.lastname: Lopes
authors.forename: L F
authors.initials: LF
authors.lastname: da Cunha
authors.forename: T A
authors.initials: TA
authors.lastname: dos Santos
authors.forename: A V
authors.initials: AV
authors.lastname: Resende
authors.forename: B H
authors.initials: BH
authors.lastname: Jorge
authors.forename: L A
authors.initials: LA
authors.lastname: Salomão
authors.forename: R T
authors.initials: RT
authors.lastname: Rodrigues
mesh_terms: D000293:Adolescent; D000328:Adult; D014355:Chagas Disease / Q000401:mortality*; D002908:Chronic Disease; D002940:Circadian Rhythm; D003645:Death, Sudden; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged
vernacular_title: Variações circadianas diárias e semanais na morte súbita da doença de Chagas.