Postoperative analgesia using phenylbutazone, flunixin or carprofen in horses.

The study explores the impact of three different types of drugs, phenylbutazone, flunixin, and carprofen, in providing post-surgery pain relief in horses. The research reveals no significant difference among the three drugs in terms of the need for additional analgesia or pain scores, although timing for further analgesia differed.

Methodology

• The study was conducted on horses that went under the knife. Following the surgery, these horses were divided randomly into three groups.
• The first group was treated with phenylbutazone at a dose of 4 mg/kg (n = 72), the second group was given flunixin at 1 mg/kg (n = 68), and the third group received carprofen at a dosage of 0.7 mg/kg (n = 63).
• The doses were administered through slow intravenous injection at the end of the procedure, just before the horses were taken off halothane.
• The pain levels of these horses were evaluated by surgical clinicians at several points – when the horses first stood up, two hours and four hours later, and the next morning.
• If repeated doses of analgesic drugs were required, the time was recorded and taken as the study end point.

Results and Conclusion

• No significant difference was found in the three groups related to the type of surgeries performed, the count of horses needing further analgesia, or the pain scores at any given time.
• In the case of horses needing further pain relief, the time at which this was needed did vary significantly among the three groups.
• The horses from the flunixin group needed further analgesia at an average of 12.8 hours after the surgery, while horses in the phenylbutazone group required additional analgesia at around 8.4 hours post-surgery.
• It was also found that the horses that received butorphanol during surgery needed significantly fewer dosages of further analgesia compared to those that were not administered any opioid.
• This study suggests that while all three drugs are effective in postoperative analgesic management, the time at which further analgesia is required differs and should be considered in the pain management strategy for post-surgical care in horses.