Continuous caudal epidural and subarachnoid anesthesia in mares: a comparative study

Area of Science:

• Veterinary Anesthesiology
• Equine Medicine
• Surgical Techniques

Background:

• Continuous caudal epidural analgesia (CEA) and caudal subarachnoid analgesia (CSA) are used for pain management in horses.
• Maintaining pelvic limb function during caudal analgesia is crucial for equine welfare and surgical outcomes.

Purpose of the Study:

• To describe a new technique for continuous CEA and CSA in adult mares.
• To evaluate the efficacy and safety of this technique, ensuring preservation of pelvic limb function.

Main Methods:

• A modified 17-gauge Huber-point directional needle was used to place a catheter in the epidural or subarachnoid space at the lumbosacral junction.
• Catheter placement was confirmed radiographically, and mepivacaine HCl was administered for analgesia.
• Physiological parameters and analgesia onset/duration were monitored in 7 mares.

Main Results:

• Both CSA and CEA provided analgesia from S-1 to the coccyx.
• CSA had a faster onset (8.2 min) but shorter duration (70 min) compared to CEA (21.4 min onset, 102.1 min duration).
• No significant changes in vital signs or pelvic limb function were observed.

Conclusions:

• The described technique allows for effective continuous CEA and CSA in horses without compromising motor function.
• This method offers a valuable option for pain management in equine surgery and medicine.
• Potential benefits and complications of CSA and CEA in horses warrant further consideration.