Effect of xylazine on cerebrospinal fluid pressure in conscious horses.

This study investigates the impact of the drug xylazine on the pressure in the cerebrospinal fluid (CSF) of healthy conscious horses. Results indicate that intravenous xylazine injection lowers CSF pressure shortly after administration, alongside transient increases in certain blood pressure metrics. The study’s implications for horses with neurological conditions or brain injuries, however, are yet to be explored.

Experimental Design

• A total of six healthy horses participated in the study.
• The lumbosacral CSF pressure of each horse was determined by inserting a catheter into the lumbosacral space.
• Various measurements, including heart rate, facial artery pressure, central venous pressure, and CSF pressure, were taken before and after the horses were intravenously injected with a saline solution control as well as the drug xylazine.
• The xylazine dosage was 1.1 mg per kg of body weight.
• Arterial pH and blood gases were also analyzed at multiple time points before and after the saline and xylazine injections.

Results

• Lumbosacral CSF pressure significantly decreased for 15 minutes following the administration of xylazine.
• Interestingly, diastolic arterial pressure increased noticeably 4 minutes after the xylazine injection, and both diastolic and mean arterial pressure rose at 6 and 8 minutes post administration.
• Minor increases in systolic arterial blood pressure and central venous pressure were noted, along with a slight reduction in heart rate.
• No significant changes were found in arterial blood gas values.

Conclusion

• Based on the research findings, the study concludes that intravenous xylazine administration significantly reduces intracranial pressure (pressure within the skull) in healthy conscious horses.
• The results are applicable only to healthy horses as the research doesn’t provide any data on the effects of xylazine on horses dealing with neurological conditions or brain trauma.