A Retrospective Study of the Incidence and Management of Complications Associated With Regional Nerve Blocks in Equine Dental Patients.

This study examines the frequency and handling of complications related to regional nerve blocks used in dental procedures for horses. It found a 2.96% rate of complications with strategies suggested to reduce this potential.

Background of the Research

• The researched centered on the use of regional anesthesia, or nerve blocks, applied to the heads of equine (horse) patients during oral dental extraction procedures.
• The study acknowledged that while the usage of four particular blocks (infraorbital nerve, maxillary nerve, mental nerve, and mandibular nerve) is well known for desensitizing dental areas for oral surgery, there isn’t much documentation on the complications associated with these anesthetic practices.

Study Design and Inclusion Criteria

• The study retrospectively analysed a total of 270 regional nerve block procedures carried out on 162 equine patients in a second opinion referral hospital setting.
• The criteria for a patient’s inclusion in the study were a 24-hour stay in the hospital, the nerve blocks being performed by a single clinician, and at least a 2-week follow-up examination.

Findings of the Research

• The research identified 8 complications in total from 7 patients. This means the complication incidence rate was 2.96%.
• The complications included supraorbital hematoma (a collection of blood outside the blood vessels in the supraorbital region – 3 cases), local hematoma (localised blood accumulation – 2 cases), lingual self-trauma (self-inflicted damage to the tongue – 2 cases), and nerve block failure to desensitize (1 case).

Recommendations

• The study provides evidence-based suggestions on how to manage and prevent these complications. These include reducing anesthetic volumes, precision in needle placement, deep understanding of the facial anatomy pertinent to nerve blocks, proper restraint of the horse, maintaining aseptic (germ-free) conditions, muzzling post surgery, and using a newly opened bottle of local anesthetic.