Capnographic monitoring during anesthesia with controlled ventilation in the horse.
Forty-five horses were maintained on halothane or isoflurane anesthesia for at least 90 minutes and received positive pressure ventilation after the first 30 minutes of anesthesia. Parameters monitored included end-tidal partial pressure of carbon dioxide (ETPCO2), arterial blood pressure, and arterial blood gases and pH. There was a statistically significant correlation between end-tidal carbon dioxide and arterial partial pressure of carbon dioxide (PaCO2) for both halothane and isoflurane anesthesia. There was no significant correlation between end-tidal carbon dioxide and either body weight or systolic blood pressure. No statistically significant difference was found in arterial to end-tidal carbon dioxide difference nor in alveolar dead space because of time or positioning over anesthetic periods of up to 3 hours. It is concluded that end-tidal carbon dioxide monitoring is a satisfactory measure of changes in respiratory acid-base balance with inhalation anesthesia in horses when ventilation is controlled.
Cribb
P H
PH
Department of Veterinary Anesthesiology, Radiology and Surgery, Western College of Veterinary Medicine, University of Saskatchewan, Saskatoon, Canada.
D000769:Anesthesia, Inhalation / Q000662:veterinary*; D000818:Animals; D001784:Blood Gas Analysis / Q000295:instrumentation / Q000662:veterinary; D001794:Blood Pressure; D002245:Carbon Dioxide / Q000032:analysis* / Q000097:blood; D006221:Halothane; D006736:Horses / Q000502:physiology*; D007530:Isoflurane; D010313:Partial Pressure; D011175:Positive-Pressure Respiration / Q000662:veterinary*; D011187:Posture; D013997:Time Factors
D002245:Carbon Dioxide; D007530:Isoflurane; D006221:Halothane