title: Lack of benefits of left tilt in emergent cesarean sections: a randomized study of cardiotocography, cord acid-base status and other parameters of the mother and the fetus.
abstract: OBJECTIVE
  To assess the benefits of performing the cesarean section in lateral tilt during active labor.
  
  
  METHODS
  University Hospital.
  
  
  METHODS
  204 unselected women undergoing cesarean section (21.1% fetal distress, 45.6% cephalo-pelvic disproportion, 26.0% induction failure, 7.4% abnormal presentation) under general (86.8%) or spinal anesthesia (13.2%).
  
  
  METHODS
  Randomized study.
  
  
  METHODS
  During anesthesia induction and cesarean section 103 women were in partial left lateralization (20 degrees), whereas the remaining 101 remained in the supine position.
  
  
  METHODS
  Internal cardiotocography during cesarean section. Umbilical artery acid-base analysis. Newborn evaluation. Maternal hemodynamic parameters.
  
  
  RESULTS
  Fetal heart rate during cesarean section was similar in both groups, except for a baseline heart rate which was slightly higher in the lateral tilt group (137.5 +/- 19.2 vs 131.1 +/- 20). The umbilical artery pH values, as well as pCO2, base deficit, CO3H and oxygen saturation were similar in both groups. The pO2 value was significantly lower in the lateral tilt group (14.03 +/- 6.04 Hg mm vs 16.02 +/- 7.65). Newborn evaluation was similar in both groups. The blood pressure and heart rate of the mother during the cesarean section were also similar in both groups.
  
  
  CONCLUSIONS
  No benefits were found in performing cesarean section in left lateral tilt.
authors.affiliation: Department of Obstetrics and Gynecology, Hospital from Cruces Baracaldo Vizcaya, País Vasco University, Spain.
authors.forename: R
authors.initials: R
authors.lastname: Matorras
authors.forename: C
authors.initials: C
authors.lastname: Tacuri
authors.forename: A
authors.initials: A
authors.lastname: Nieto
authors.forename: G
authors.initials: G
authors.lastname: Gutierrez de Terán
authors.forename: J
authors.initials: J
authors.lastname: Cortés
mesh_terms: D000136:Acid-Base Equilibrium; D000328:Adult; D001034:Apgar Score; D001794:Blood Pressure; D002585:Cesarean Section / Q000379:methods*; D005260:Female; D005865:Gestational Age; D006339:Heart Rate; D006340:Heart Rate, Fetal; D006801:Humans; D007231:Infant, Newborn; D011187:Posture; D011247:Pregnancy; D016683:Supine Position; D014469:Umbilical Arteries; D014599:Uterus / Q000502:physiology