Enflurane, halothane, and isoflurane potency in horses
Steffey, E.P.; Howland, D.; Giri, S.; Eger, E.I.
American Journal of Veterinary Research 38(7): 1037-1039
1977
ISSN/ISBN: 0002-9645 PMID: 883711 Document Number: 111342
The minimal alveolar concentration of anesthetic required to prevent gross purposeful movement in response to electrical stimulation of oral mucous membranes was determined in horses for 3 agents. Equipotent concentrations of enflurane were 2.12 volumes %; of halothane, 0.88 volumes %; and of isoflurane, 1.31 volumes +. The alveolar concentration required to produce at least 60 seconds of apnea was also determined for these agents. From these data and the minimal alveolar concentration information, anesthetic indices were determined for each agent. The indices for enflurane, halothane, and isoflurane were 2.26, 2.60, and 2.33, respectively.