title: Mode of delivery and perinatal cerebral blood flow.
abstract: OBJECTIVE
  To ascertain whether the perinatal cerebral blood flow velocity differed between vaginally delivered appropriate for gestational age (vag. AGA) term babies, AGA babies delivered by Caesarean section (C.s. AGA), and small for gestational age (C.s. SGA) babies also delivered by Caesarean section.
  
  
  METHODS
  Forty-five babies were examined by Doppler ultrasound of the middle cerebral artery prior to and immediately after delivery, and at 1 h and 24 h after birth. The pulsatility index (PI) and time-averaged maximum velocity (TAMXV) were calculated.
  
  
  RESULTS
  No differences in TAMXV were found between the vag. AGA and C.s. AGA groups at any of the four recordings. A significantly higher PI value was found in the C.s. AGA group 1 h after birth. The C.s. SGA group had lower PI values before and just after birth, but did not differ significantly from the C.s. AGA group at 1 h or 24 h after birth.
  
  
  CONCLUSIONS
  The results suggest mode of delivery to have a transitory effect on cerebral vascular resistance in healthy term AGA babies. The C.s. SGA group differed in the initial recording just after birth, but later manifested similar blood flow velocities in middle cerebral artery as the C.s. AGA group.
authors.affiliation: Department of Obstetrics and Gynaecology, University Hospital MAS, Malmö, Sweden.
authors.forename: A
authors.initials: A
authors.lastname: Maesel
authors.forename: P
authors.initials: P
authors.lastname: Sladkevicius
authors.forename: S
authors.initials: S
authors.lastname: Gudmundsson
authors.forename: K
authors.initials: K
authors.lastname: Mars al
mesh_terms: D001783:Blood Flow Velocity; D002536:Cerebral Arteries / Q000502:physiology; D002560:Cerebrovascular Circulation; D002585:Cesarean Section; D036861:Delivery, Obstetric; D005260:Female; D005865:Gestational Age; D006801:Humans; D007231:Infant, Newborn; D011247:Pregnancy; D014655:Vascular Resistance