title: [Demographic impact of cesarean section].
abstract: BACKGROUND
  in the vital statistics the cesarean section is a cause that makes reference to births and deaths.
  
  
  OBJECTIVE
  to analyze the frequency of the cesarean section, the changes brought about in the rates of maternal, perinatal mortality and of natality, and their relation with reliable contraceptive methods.
  
  
  METHODS
  retrospective study realized with the dices of patients of the Coordination of Reproductive Health of the Mexican Institute of the Social Insurance (IMSS) of the state of Aguascalientes (Mexico). The births were registered majors of 20 weeks of gestation, the maternal and perinatal deaths from 1990 to 2007 in the hospitals of the IMSS in Aguascalientes. The rate of cesarean calculated by means of the registry of the number of the same realized per year and they were divided between the total of vaginal and abdominal births, and the result multiplied percent.
  
  
  RESULTS
  201,563 obstetrical events were registered, of which 145,106 corresponded to vaginal childbirths and 56,457 abdominal ones. With these data a global rate of cesarean section of 28% was obtained, with 201,182 new born alive ones and 2,618 perinatal ones. The acceptance of the tubary bilateral occlusion maintained a constant increase during the period of study, like the intrauterine device. The acceptance from the bilateral occlusion was completely different tubary during the cesarean one, in comparison with the childbirth.
  
  
  CONCLUSIONS
  the long term results show positive influence in the reduction of the rate of natality.
authors.affiliation: Servicio de Ginecología y Obstetricia, Hospital General de Zona 2 (IMSS), Aguascalientes, Aguascalientes.
authors.forename: Enrique
authors.initials: E
authors.lastname: Rosales Aujang
authors.forename: Jesús Alberto
authors.initials: JA
authors.lastname: Felguérez Flores
mesh_terms: D001723:Birth Rate / Q000639:trends*; D002585:Cesarean Section / Q000706:statistics & numerical data*; D003267:Contraception / Q000706:statistics & numerical data*; D005260:Female; D006801:Humans; D007226:Infant Mortality / Q000639:trends*; D007231:Infant, Newborn; D008428:Maternal Mortality / Q000639:trends*; D012189:Retrospective Studies