Enflurane Analgesia in Obstetrics

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Abstract
The effects of enflurane analgesia (.apprx. 0.5%) were studied in 55 patients during the 2nd stage of normal vaginal delivery and were compared with effects of nitrous oxide (.apprx. 40%) in 50 similar patients. The enflurane and oxygen mixture was rated satisfactory by 89% of the mothers and 80% of the anesthesiologists. These ratings did not differ significantly from those for nitrous oxide. Obstetricians rated the enflurane and oxygen mixture superior. The newborns of mothers receiving both agents were vigorous and comparable when assessed by Apgar scores and cord blood gas tensions. The estimate of blood loss was similar in both groups. Serum inorganic fluoride concentrations in the mother after anesthesia were not significantly increased from preanesthetic levels with either agent. There was no biochemical evidence of renal toxicity. In neonates of mothers given enflurane, the mean umbilical cord concentration of serum inorganic fluoride ions was 2.4 .+-. 0.2 .mu.mol/l, a value well below that associated with nephrotoxicity.

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