Evaluation of the Effects of Doxapram in Combination with Xylazine on Recovery of Horses Isoflurane-Anesthetized.

The research study involved examining the effects of a drug combination, specifically doxapram and xylazine, on the recovery of horses from the anesthesia drug, isoflurane. The study found that this drug combination did not have any significant impact on the recovery time or quality for the horses.

Study Design and Methodology

• The study design was a randomized double-blinded process, which ensured no bias in the treatment administration and the evaluation of the results.
• The study was performed on six horses, each getting anesthetized four times with a minimum gap of two weeks between each treatment, to let the effects of the previous treatment completely wash out.
• The horses were anesthetized using a cocktail of drugs including xylazine, ketamine, midazolam, and finally maintained under anesthesia using isoflurane for 90 minutes.
• The horses, for recovery, received one of the following, randomly chosen treatments: RX (xylazine), RXD1 (xylazine and doxapram), RXD2 (xylazine and a higher dosage of doxapram), and RS (saline).
• Horses were aided by rope during recovery and their progress was evaluated with a descriptive qualitative scale.

Investigations and Results

• Heart rate, respiratory frequency, and blood gas analysis were conducted at an interval of 5 minutes for as long as the horse allowed. The collected data were analyzed using either the ANOVA or Friedman test.
• The study worked but didn’t find any significant difference in the time taken for the horses to get to a resting posture (sternal) or to stand, across all four groups (RX, RXD1, RXD2, and RS).
• Decreases in heart rate over time were observed in the RXD1 and RXD2 groups, but these decreases were not significant.
• No changes in respiratory frequency were observed among any of the groups. Additionally, recovery scores, which qualitatively measured recovery quality, did not differ across groups.

Conclusion

• The research concluded that administering doxapram, in combination with xylazine, to isoflurane-anesthetized horses did not result in any significant changes in the recovery time or the quality of recovery.