Effect of 3% chloroprocaine hydrochloride when used for median and ulnar regional nerve blocks in lame horses.

The study investigates the efficacy of 3% chloroprocaine hydrochloride versus 2% mepivacaine hydrochloride for providing pain relief in lame horses undergoing median and ulnar nerve blocks. The results indicate that 3% chloroprocaine hydrochloride provided rapid and effective pain relief compared to 2% mepivacaine hydrochloride.

Research Methodology

• The study was a crossover experiment conducted with 6 lame horses, which were divided into two treatment groups. One group first received 3% chloroprocaine while the other received 2% mepivacaine.
• The median and ulnar nerve blocks were performed in the affected limb of the horse. The lameness of the horse was evaluated before and at different time intervals for 120 minutes after the nerve block procedure using a wireless inertial sensor-based motion analysis system.
• A 7-day washout period was put in place in between the treatments for removing traces of the first drug before administering the second. The horses then received the other treatment and the lameness assessments were repeated.

Research Findings

• The results of the study showed that median and ulnar nerve blocks performed with 3% chloroprocaine provided quicker and more effective relief from lameness than those performed with 2% mepivacaine. The improvement was particularly significant between 20 and 40 minutes after administering the injection.
• Complete disappearance of lameness occurred after an average of 9 minutes following the injection with 3% chloroprocaine. In contrast, it took roughly 28 minutes for the lameness to completely disappear after the injection with 2% mepivacaine.

Conclusions

• The findings of the study suggest that 3% chloroprocaine is superior to 2% mepivacaine in terms of rapid onset and effective analgesia when used for median and ulnar nerve blocks in lame horses.
• Considering the promising effects of 3% chloroprocaine, it would potentially be beneficial for use in complicated lameness evaluations in equine practice.