title: Effects of colloid preload on placenta stereology and cord blood S100β protein during cesarean section under spinal anesthesia.
abstract: OBJECTIVE
  To determine the optimal dose of colloid preload, which is both safe and effective, for preventing hypotension in parturients undergoing cesarean section under spinal anesthesia.
  
  
  METHODS
  Forty-five healthy, termed parturients scheduled for cesarean delivery under spinal anesthesia were randomly assigned to 3 colloid preload groups to receive gelofusine infusion at the rates of 5, 10, or 15 ml·kg(-1)·h(-1) (groups I, II, and III, respectively). Colloid preload was administered 10 min before spinal anesthesia and maintained until the delivery. Blood pressure (BP) and heart rate (HR) of the parturients were monitored during the operation, and Apgar scores at 1 and 5 min after birth were recorded. S100β protein concentration and blood gas values of the umbilical artery were also measured. The vascular adaptation in the placental villous capillary was evaluated stereologically.
  
  
  RESULTS
  At each time point of measurement, BP and HR showed no significant differences among the 3 groups during the operation (P>0.05), but within the same group, BP and HR underwent significant variations during the operation; groups II and III maintained more stable hemodynamics compared to group I. Apgar scores and blood gas analysis, pH value, and S100β protein in the umbilical artery showed no significant differences among the 3 groups (P>0.05). The 3 groups exhibited no significant differences in the length and volume density of the placental villous capillaries (P>0.05).
  
  
  CONCLUSIONS
  Colloid preload with gelofusine administered at the rate of 10 ml·kg(-1)·h(-1) can reduce the incidence and severity of hypotension in cesarean section under spinal anesthesia with the least adverse maternal and fetal effects.
authors: Department of Anesthesiology, First Affiliated Hospital of Jinan University, Guangzhou, China. pengxuemeijnu@tom.com
authors: Xuemei
authors: X
authors: Peng
authors: Huihui
authors: H
authors: Liu
authors: Lu
authors: L
authors: Xi
authors: Huadong
authors: H
authors: Wang
authors: Ruiman
authors: R
authors: Li
authors: Bing
authors: B
authors: Shuai
mesh_terms: D000328:Adult; D000773:Anesthesia, Obstetrical; D000775:Anesthesia, Spinal; D002585:Cesarean Section / Q000379:methods*; D003102:Colloids / Q000008:administration & dosage*; D005260:Female; D005312:Fetal Blood / Q000378:metabolism*; D006801:Humans; D007022:Hypotension / Q000517:prevention & control; D009414:Nerve Growth Factors / Q000097:blood*; D010920:Placenta / Q000098:blood supply*; D011097:Polygeline / Q000008:administration & dosage; D011247:Pregnancy; D009418:S100 Proteins / Q000097:blood*
chemical_list: D003102:Colloids; D009414:Nerve Growth Factors; D009418:S100 Proteins; D011097:Polygeline