title: [A 35 year period review of the perinatal mortality in a gynecology-obstetric unit].
abstract: OBJECTIVE
  To estimate the perinatal mortality rates over a 35 year period in neonates 22 weeks' gestation or above 500 g at birth until seven days postdelivery.
  
  
  METHODS
  Data was obtained from medical records and the fetal death (FD) and neonatal death (ND) certificates.
  
  
  RESULTS
  There were 889 282 deliveries (D) with 10,178 FD (11.2/1000 D) and 10,126 ND [11.3/1000 live newborns (LNB) with a significant reduction from 1972 to 2006 of 57 % in fetal mortality rate (p <0.0001) and 18.8 % in neonatal mortality rate (p <0.01). We registered 8081/10,126 (79.84 %) neonates who died from 0 to 6 days (9.2/1000 LNB). The overall perinatal mortality rate was 20.5/1000 D, with a 48.4 % significant reduction from 1972 to 2006 (p < 0.0001), 27.8/1000 ND, a 13.5/1000 ND respectively. We observed 4161 immature neonates (0.47 %); 55,340 premature newborns (6.2 %) and 9055 twin pregnancies (1 %).
  
  
  CONCLUSIONS
  The fetal, neonatal and perinatal mortality rates were below the national media and presented a significant decrease from 1972 to 2006, more accentuated in fetal mortality rate (57 %) and perinatal mortality rate (48.4 %).
authors.affiliation: Hospital de Ginecoobstetricia 23, Instituto Mexicano del Seguro Social, Monterrey, Nuevo León, Mexico. richdzher @hotmail.com
authors.forename: Ricardo Jorge
authors.initials: RJ
authors.lastname: Hernández-Herrera
authors.forename: Luis Gerardo
authors.initials: LG
authors.lastname: Alcalá-Galván
authors.forename: Norma Elia
authors.initials: NE
authors.lastname: Castillo-Martínez
authors.forename: Roberto
authors.initials: R
authors.lastname: Flores-Santos
authors.forename: Raúl
authors.initials: R
authors.lastname: Cortés-Flores
authors.forename: Adriana
authors.initials: A
authors.lastname: Buenrostro-Lozano
mesh_terms: D006176:Gynecology; D006757:Hospital Units; D006801:Humans; D007231:Infant, Newborn; D009774:Obstetrics; D054238:Perinatal Mortality / Q000639:trends*; D012189:Retrospective Studies; D013997:Time Factors