A comparison of xylazine-diazepam-ketamine and xylazine-guaifenesin-ketamine in equine anesthesia.

The research article studies the effect of different anesthesia protocol combinations of xylazine-diazepam-ketamine and xylazine-guaifenesin-ketamine on horses and deduces that a high dose of diazepam can be used as a substitute for guaifenesin to induce comparable quality of anesthesia.

Methodology

• Horses were first sedated with xylazine before being subjected to anesthesia induction using various combinations of ketamine with either guaifenesin or two different doses of diazepam.
• Following the induction, the anesthesia was sustained using halothane for a duration of 30 minutes.
• An array of physiological metrics including heart rate, respiratory rate, blood pressure, blood gas concentrations, and pH levels were measured before and after the induction of anesthesia.
• The quality and characteristics of induction and recovery were also evaluated objectively by an observer who was not aware of the protocol used.

Findings

• Pre-induction values across the three different protocols showed no significant variations.
• Greater ataxia, or lack of coordination, was observed at the induction phase when guaifenesin was used.
• The lower dose of diazepam was found to lead to movements and impedance with intubation, leading to its classification as unsatisfactory.
• The higher dose of diazepam yielded results comparable to guaifenesin in regard to the induction process, transition to, and recovery from general anesthesia.

Conclusions

• The study concluded that diazepam (0.10 mg/kg) could provide a suitable alternative for guaifenesin (100 mg/kg) when it comes to inciting a comparable quality of anesthesia in horses.