title: Smoking during pregnancy and placental pathology.
abstract: The pathological study of all placentas from women smoking at least five cigarettes daily during pregnancy (248 cases) and of those placentas from a corresponding control group randomised among all the non-smokers (196 cases) has been set up at the maternity hospital of Haguenau (France) since 1974. The systematic histological examination has shown among smokers a higher frequency of abonormal trophoblast and especially of nuclear clumps in the syncytiotrophoblast. On the other hand, according to a standard protocol, the grouping of various abnormalities has shown, among smokers, a higher frequency of "signs of hypoxia". The lack of relationship between these "signs of hypoxia" and the well-known decreased birthweight among smokers suggests that smoking during pregnancy could always go with a decreased birthweight without a corresponding decreased placental weight, and seldom with an intra-uterine hypoxia. These two effects are independent.
mesh_terms: D000328:Adult; D001724:Birth Weight; D005260:Female; D005311:Fetal Hypoxia / Q000209:etiology; D005602:France; D006801:Humans; D009929:Organ Size; D010920:Placenta / Q000033:anatomy & histology; D010922:Placenta Diseases / Q000209:etiology* / Q000473:pathology; D011247:Pregnancy; D012907:Smoking / Q000150:complications*