Minimum anesthetic dose and cardiopulmonary dose response for halothane in chickens
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J W Ludders1, G S Mitchell, S L Schaefer
1Department of Surgical Sciences, School of Veterinary Medicine, University of Wisconsin, Madison 53706.
Abstract:
The minimum anesthetic dose (MAD) and the cardiopulmonary dose-response for halothane were determined in male chickens. The MAD for halothane was 0.85 +/- 0.09% (mean +/- SD), with a range of 0.75% to 0.98%. There was a significant (P less than 0.002) positive correlation between increasing concentrations of halothane and PaCO2, and significant negative correlations of halothane concentration with respiratory rate (P less than 0.04), arterial blood pH (P less than 0.008), and mean arterial blood pressure P less than 0.008). A significant correlation was not found between halothane concentration and heart rate or arterial blood bicarbonate concentration. It was concluded that the MAD for halothane in chickens is similar to values for minimum alveolar concentrations of halothane in mammalian species, and that there is substantial dose-dependent depression of cardiopulmonary function in chickens.
Insights
The minimum anesthetic dose (MAD) for halothane in chickens is comparable to mammals. Higher halothane concentrations significantly depress chicken cardiopulmonary function, impacting blood gases and blood pressure.
Area of Science:
- Veterinary Anesthesiology
- Avian Physiology
- Pharmacology
Background:
- Determining anesthetic safety and efficacy in avian species is crucial for veterinary practice.
- Halothane is a common inhalation anesthetic, but its effects on chickens require specific investigation.
Purpose of the Study:
- To establish the minimum anesthetic dose (MAD) of halothane in male chickens.
- To characterize the cardiopulmonary dose-response effects of halothane in this species.
Main Methods:
- Male chickens were administered halothane to determine the MAD.
- Cardiopulmonary parameters, including arterial blood gases, pH, respiratory rate, heart rate, and mean arterial blood pressure, were monitored at varying halothane concentrations.
Main Results:
- The MAD for halothane was determined to be 0.85 +/- 0.09%.
- Increasing halothane concentrations showed a positive correlation with PaCO2 and negative correlations with respiratory rate, arterial blood pH, and mean arterial blood pressure.
- No significant correlation was found with heart rate or arterial bicarbonate concentration.
Conclusions:
- The MAD for halothane in chickens is similar to minimum alveolar concentrations in mammals.
- Halothane causes significant, dose-dependent cardiopulmonary depression in chickens, necessitating careful monitoring during anesthesia.