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Halothane 2% for caesarean section.

J E Pedersen1, A Fernandes, M Christensen

  • 1Department of Anaesthesiology, University Hospital of Glostrup, Denmark.

European Journal of Anaesthesiology
|July 1, 1992
PubMed
Summary
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High-concentration halothane anesthesia for Cesarean sections reduced maternal awareness but posed risks to neonates with fetal distress. Lower concentrations were safer for newborns when the induction-delivery interval was brief.

Area of Science:

  • Anesthesiology
  • Obstetrics
  • Neonatal Care

Background:

  • Cesarean section anesthesia choices impact maternal and neonatal outcomes.
  • Halothane has been used for Cesarean delivery anesthesia, but its optimal concentration and effects require clarification.

Purpose of the Study:

  • To compare the effects of 2% halothane in oxygen versus 0.5% halothane in oxygen/nitrous oxide during the induction-delivery interval for Cesarean sections.
  • To evaluate maternal awareness, hemorrhage, and neonatal well-being under different halothane anesthesia regimens.

Main Methods:

  • Anesthesia administered during the induction-delivery interval for Cesarean sections.
  • Comparison of 2% halothane in pure oxygen with 0.5% halothane in 50% oxygen/50% nitrous oxide.
  • Assessment of maternal awareness, intraoperative hemorrhage, and neonatal status (Apgar scores, umbilical blood gases) in relation to preoperative fetal condition.

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Main Results:

  • No excessive hemorrhage observed with oxytocin infusion.
  • Maternal awareness occurred in 15% of cases with 0.5% halothane/nitrous oxide, but not with 2% halothane.
  • Neonates were unaffected by halothane concentration with short induction-delivery intervals and no fetal distress.
  • Neonatal condition worsened with 2% halothane in cases of preoperative fetal distress, indicated by lower Apgar scores and altered blood gas values.

Conclusions:

  • 2% halothane in oxygen provides amnesia during Cesarean delivery but may compromise neonates with fetal distress.
  • 0.5% halothane in oxygen/nitrous oxide carries a risk of maternal awareness.
  • Anesthesia choices should consider the presence of fetal distress and the induction-delivery interval to optimize maternal and neonatal outcomes.