title: Dose-response relationships for infusions of Althesin or methohexitone.
abstract: A technique is described for the determination of equipotent rates of infusion of intravenous hypnotic agents. Two end points have been defined; the rates needed to suppress the initial response to the surgical incision in 50% (ED50) and 95% (ED95) of patients receiving continuous infusion anaesthesia to supplement 67% nitrous oxide in oxygen. For patients aged 20-60 years, and premedicated with morphine 0.15 mg/kg intramuscularly, the ED50 values for Althesin (as alphaxalone) and methohexitone by infusion were 13.7 and 48.8 micrograms/kg/minute respectively. The ED95 values were 18.1 and 75.9 micrograms/kg/minute. For patients of a similar age premedicated with diazepam 10 mg orally, the ED50 values for Althesin and methohexitone were 18.5 and 66.0 micrograms/kg/minute respectively; while the ED95 values were 24.2 and 80.8 micrograms/kg/minute.
mesh_terms: D000328:Adult; D000530:Alfaxalone Alfadolone Mixture / Q000008:administration & dosage*; D000771:Anesthesia, Intravenous; D004305:Dose-Response Relationship, Drug; D005260:Female; D006801:Humans; D007263:Infusions, Parenteral; D008297:Male; D008723:Methohexital / Q000008:administration & dosage*; D008875:Middle Aged; D013810:Therapeutic Equivalency
chemical_list: D000530:Alfaxalone Alfadolone Mixture; D008723:Methohexital