Intravenous anaesthesia in horses by guaiphenesin-ketamine-detomidine infusion: some effects.

This research paper investigates the effects of a specific combination of drugs (guaiphenesin, ketamine, detomidine) for total intravenous anesthesia in horses undergoing surgery. The results suggest that this infusion may be an effective method for maintaining anesthesia in horses, even though there were some notable changes in certain blood parameters.

Design and Participants

• The study was conducted on 10 horses that were scheduled for elective surgery.
• The effectiveness and impacts of an intravenous infusion of guaiphenesin, ketamine, and detomidine as an anesthetic were assessed.

Method and Procedure

• Anaesthesia was maintained through the continuous infusion of guaiphenesin, ketamine, and detomidine, and the rate of infusion was 1 ml/kg/hr.
• During the anesthesia process, certain physiological parameters were continually recorded, including pulse rate and mean arterial blood pressure.
• Arterial blood gases and pH levels were measured right after anesthesia induction and at regular intervals during the anesthesia period to monitor the patients’ systemic responses.
• Venous blood was also sampled to examine the concentrations of plasma glucose, lactate, lactate dehydrogenase (LDH), creatine phosphokinase (CPK), and aspartate aminotransferase (AST).
• The values obtained from these measurements were compared with the respective parameters recorded before administering the premedication.

Results and Findings

• Most parameters, aside from plasma glucose concentration, arterial oxygen (O2) tension, and AST concentration, didn’t show significant changes and stayed within normal ranges.
• The plasma glucose level significantly rose after the induction of anesthesia compared to the control value, but it returned to normal during the anesthesia process.
• The arterial oxygen tension was on average 30% lower than the desired normal level. This might signify a degree of respiratory compromise or anesthetic depth.
• The plasma concentration of AST, a liver enzyme, significantly decreased by the end of anesthesia compared to the control value. This might suggest that the infused drugs do not exert harmful effects on the liver, or decrease metabolic or work rate.

Conclusion

• Based on the findings, the researchers concluded that an infusion of guaiphenesin, ketamine, and detomidine could be helpful for maintaining total anesthesia in horses.
• The changes in certain blood parameters might require further investigation for better understanding and refining the methodology.