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Evaluation of 25%, 50%, and 67% Nitrous Oxide with Halothane‐Oxygen for General Anesthesia in Horses
Author(s) -
TESTA MARCO,
RAFFE MARC R.,
ROBINSON ELAINE P.
Publication year - 1990
Publication title -
veterinary surgery
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.652
H-Index - 79
eISSN - 1532-950X
pISSN - 0161-3499
DOI - 10.1111/j.1532-950x.1990.tb01194.x
Subject(s) - nitrous oxide , halothane , medicine , anesthesia , oxygen , bicarbonate , heart rate , blood pressure , chemistry , organic chemistry
Twenty‐five percent, 50%, and 67% nitrous oxide was administered to 12 horses anesthetized with halothane and oxygen. Compared to halothane‐oxygen alone, there was no significant difference in heart rate, systolic, diastolic, or mean blood pressure values, arterial pH, PaCO 2 , or plasma bicarbonate values when nitrous oxide was included. A significant linear reduction in PaO 2 values could be correlated with N 2 O:O 2 concentrations. The halothane level required to maintain surgical anesthesia was reduced when nitrous oxide was administered, but it was not affected by changing the nitrous oxide concentrations. Nitrous oxide concentrations greater than 25% provide no additional reduction in halothane requirement and may be accompanied by PaO 2 values that pose risk to the horse.