title: Perinatal mortality in twin pregnancies: a 3-year analysis in Seine Saint-Denis (France).
abstract: OBJECTIVE
  Our purpose was to evaluate perinatal mortality in twins and to investigate factors associated with this mortality.
  
  
  METHODS
  A prospective study on the perinatal mortality was performed in the department of Seine-Saint-Denis. Out of all the perinatal deaths, we have retrospectively isolated those arising from twin pregnancies.
  
  
  RESULTS
  There were 54 twin pregnancies complicated with perinatal death. The perinatal mortality rate in twin pregnancy was 78.0 per 1000 twin babies delivered. Out of 86 twin deaths, 38 (44.2%) were born before 28 weeks gestation and out of 82 twin perinatal deaths, 37 (45.1%) weighed less than 1000 g. Chorionicity was recorded in 44 twin pairs: 21 (47.7%) were dichorionic and 23 (52.3%) monochorionic. Finally, out of 48 twin sets there were four (8.3%) monoamniotic pregnancies.
  
  
  CONCLUSIONS
  The present data show that extreme prematurity represents nearly half of perinatal mortality in twins. This study indicates also a significant proportion of monochorionic placentation among twin pregnancies with poor outcome.
authors.affiliation: Department of Obstetrics and Gynecology, Centre Hospitalier Général R. Ballanger, Aulnay-sous-Bois, France. yvon.chitrit@wanadoo.fr
authors.forename: Y
authors.initials: Y
authors.lastname: Chitrit
authors.forename: M
authors.initials: M
authors.lastname: Filidori
authors.forename: J C
authors.initials: JC
authors.lastname: Pons
authors.forename: M
authors.initials: M
authors.lastname: Duyme
authors.forename: E
authors.initials: E
authors.lastname: Papiernik
mesh_terms: D000328:Adult; D004200:Diseases in Twins; D005260:Female; D005315:Fetal Diseases / Q000401:mortality; D005602:France / Q000453:epidemiology; D005865:Gestational Age; D006801:Humans; D007226:Infant Mortality; D007231:Infant, Newborn; D011247:Pregnancy; D011446:Prospective Studies; D012189:Retrospective Studies; D014427:Twins