title: Maternal blood pressure and dominant sleeping position may affect placental localization.
abstract: OBJECTIVE
  This study investigates whether maternal socio-demographic and clinical characteristics influence the site of placental implantation so that placental localization and associated abnormalities can be predicted.
  
  
  METHODS
  This study reviews 500 healthy women with singleton pregnancy that were consecutively admitted to the study center and eventually delivered healthy newborns.
  
  
  RESULTS
  The most frequently observed sites of placentation were anterior uterine wall (53.2%), posterior uterine wall (28.8%), lateral uterine walls (10.0%) and uterine fundus (8.0%), respectively. The women with fundal placentation had significantly higher systolic and diastolic blood pressures (p = 0.044 and p = 0.040, respectively). Supine sleeping position was more frequent in women with anterior placenta and (OR: 11.568, 95% CI: 2.720-49.193) and prone sleeping position was more frequent in women with posterior placenta (OR: 15.449, 95% CI: 2.151-52.978) (p = 0.001). The women who favored to sleep in right lateral position were more likely to have lateral placentation, while the women who used to sleep in left lateral position were more likely to have fundal placentation (p = 0.001).
  
  
  CONCLUSIONS
  Sleeping position in early pregnancy may influence placental implantation site. The probable mechanism may refer to the alterations in uterine perfusion which is induced by the change in systemic blood pressure and dominant sleeping position.
authors.affiliation: Department of Obstetrics and Gynecology, Afyon Kocatepe University Medical Faculty Hospital , Afyonkarahisar , Turkey.
authors.forename: Gulengul Nadirgil
authors.initials: GN
authors.lastname: Koken
authors.forename: Mine
authors.initials: M
authors.lastname: Kanat-Pektas
authors.forename: Seda
authors.initials: S
authors.lastname: Kayman Köse
authors.forename: Dagistan Tolga
authors.initials: DT
authors.lastname: Arioz
authors.forename: Mehmet
authors.initials: M
authors.lastname: Yilmazer
mesh_terms: D000293:Adolescent; D000328:Adult; D001794:Blood Pressure; D005260:Female; D006801:Humans; D010929:Placentation; D011247:Pregnancy; D016684:Prone Position / Q000502:physiology*; D012189:Retrospective Studies; D012890:Sleep; D012959:Socioeconomic Factors; D016683:Supine Position / Q000502:physiology*; D055815:Young Adult
keywords: Blood pressure; placenta; placenta previa; pregnancy; sleep