title: Effects of maternal supplementary oxygen on the newborn for elective cesarean deliveries under spinal anesthesia.
abstract: OBJECTIVE
  The aim of this investigation was to determine whether supplementary oxygen provided by either nasal cannula or face mask versus room air might affect fetal oxygenation during elective cesarean section under spinal anesthesia by assessing maternal and neonatal regional cerebral oxygenation (rSO(2)) with a cerebral oximeter.
  
  
  METHODS
  Ninety parturients were randomly allocated into three groups: two groups received 5 L/min oxygen by either nasal cannula (Group NC, n = 30) or face mask (Group FM, n = 30), respectively, and the third group was allowed to breathe room air (Group RA, n = 30). After maternal mean arterial pressure, heart rate and peripheral oxygen saturation had been monitored, rSO(2) was determined by cerebral oximeter. Umbilical artery (UA) and venous (UV) blood samples were collected for blood gas analysis. Neonatal rSO(2) and Apgar scores were recorded.
  
  
  RESULTS
  The mean maternal rSO(2) which was recorded 3 and 5 min after administration of the spinal block in Group FM was lower than that of Group NC (p = 0.033 and 0.042, respectively). Neonatal rSO(2), UA pH, UV pH and UA base excess (BE) were lower in Group FM than in the other groups (p < 0.05). The Apgar score (1 min) in Group FM was lower than that of Group RA (p = 0.046).
  
  
  CONCLUSIONS
  The effect of maternal supplementary oxygen on the newborn has been demonstrated by a cerebral oximeter monitor and supported by umbilical cord blood gas analysis and Apgar scores.
authors.affiliation: Department of Anesthesiology, Gazi University Faculty of Medicine, Besevler, 06500, Ankara, Turkey. gunaydin@gazi.edu.tr
authors.forename: Berrin
authors.initials: B
authors.lastname: Gunaydin
authors.forename: Tuncay
authors.initials: T
authors.lastname: Nas
authors.forename: Aydan
authors.initials: A
authors.lastname: Biri
authors.forename: Esin
authors.initials: E
authors.lastname: Koc
authors.forename: Ayfer
authors.initials: A
authors.lastname: Koc
authors.forename: Kevin
authors.initials: K
authors.lastname: McCusker
mesh_terms: D000328:Adult; D000773:Anesthesia, Obstetrical; D000775:Anesthesia, Spinal; D001034:Apgar Score; D001784:Blood Gas Analysis; D002585:Cesarean Section; D017558:Elective Surgical Procedures; D005260:Female; D005312:Fetal Blood / Q000737:chemistry; D005333:Fetus / Q000378:metabolism; D006801:Humans; D007223:Infant; D007231:Infant, Newborn; D010092:Oximetry; D010102:Oxygen Inhalation Therapy; D011187:Posture / Q000502:physiology; D011247:Pregnancy; D011446:Prospective Studies