title: Entonox analgesia in labour. A pilot study to reduce the delay between demand and supply.
abstract: In a pilot study in six mothers using 50% nitrous oxide and 50% oxygen (Entonox) as an intermittent self-administered analgesic during labour, a significant reduction in the mean times to attain specified end-tidal nitrous oxide concentrations was obtained by a continuous nasal supplement of Entonox. The method proved acceptable in this small number of patients and there were no demonstrable effects upon fetal heart rate.
mesh_terms: D000769:Anesthesia, Inhalation / Q000379:methods*; D000773:Anesthesia, Obstetrical / Q000379:methods*; D005260:Female; D006801:Humans; D007747:Labor Stage, First; D009609:Nitrous Oxide; D010100:Oxygen; D011247:Pregnancy; D013997:Time Factors
chemical_list: D009609:Nitrous Oxide; D010100:Oxygen