Dexmedetomidine and Bupivacaine Association in Caudal Epidural Injection in Mares.

The study examined how the joint use of bupivacaine and dexmedetomidine in caudal epidural injections affects analgesia in mares as compared to using each drug separately. The findings suggest that their combined use is effective for pain relief in certain procedures.

Study Methodology

In conducting their research, the authors:

• Used six healthy saddle mares, weighing between 330-370 kg and aged between 10-15 years
• Administered three treatment options to each mare: bupivacaine alone, dexmedetomidine alone, and a combination of both drugs
• Injected the drugs into the caudal epidural space (Co1-Co2) using a 16-G Tuohy epidural needle
• After the injections, took measurements of heart rate, respiratory rate, arterial blood pressure (diastolic, systolic and mean), and rectal temperature at multiple time points
• Assessed analgesia, behavioral and motor blockade using a subjective scoring system at the same time points

Key Findings

The study produced the following findings:

• The combined use of bupivacaine and dexmedetomidine (BPDX treatment) provided double the analgesic action duration as compared to using bupivacaine alone (BP treatment)
• However, the duration of analgesia provided by dexmedetomidine alone (DX treatment) was longer compared to the BPDX treatment
• All treatments resulted in what the authors refer to as a ‘mild motor blockade’
• No changes were observed in the animals’ behavior among the three groups
• There was hemodynamic stability without significant changes in the respiratory rate across all treatments

Implications of the findings

This research suggests that:

• The combination of bupivacaine and dexmedetomidine used in caudal epidural injections could potentially be an option for pain management in painful obstetric and gynecological procedures in mares