Clinical use of antimicrobial regional limb perfusion in horses: 174 cases (1999-2009).

This research article details an investigation into the use, complications, and outcomes of regional limb perfusion with antimicrobials (A-RLP) in horses, using data from 174 cases collected over a decade. The results suggest A-RLP is a safe technique with minimal side effects, but horses with synovial structure infections had lower survival rates.

Overview of Study and Methodology

• The study is retrospective, meaning it looks back on past cases. The researchers examined the medical records of 174 horses treated with A-RLP between 1999 and 2009 to evaluate the effectiveness and safety of this treatment.
• Among these records, the research team accounted for numerous factors including signalment (a description of the horse), primary complaint, horse use, etiology (cause of the condition), duration of clinical signs, previous treatment, involved structures, concurrent conditions, A-RLP characteristics, additional treatments, complications, and the final outcome.
• The horses were categorized into three groups: Group 1 (septic synovitis), Group 2 (extrasynovial lacerations and fresh, minimally contaminated intrasynovial lacerations with no established synovial infection), and Group 3 (other miscellaneous conditions).

Findings of the Study

• Only a small portion of cases resulted in minor complications. 12.26% complications were reported for horses that received IV A-RLP and 33% for those that received intraosseous A-RLP, although still indicating the IV route had fewer complications.
• Horses with septic synovitis (infection of synovial structures) had a lower survival rate of 53.43%, compared to horses with lacerations, who had a much higher survival rate of 91.89%.
• Within group 2, the study did not find significant differences in short- or long-term outcomes between horses with extrasynovial and fresh, minimally contaminated intrasynovial lacerations.
• For the survivor horses that returned to previous use, 80% with septic synovitis and 72.72% with lacerations were performing at the same or higher level at the time of follow-up.

Conclusions Drawn from the Study

• Based on these findings, the researchers conclude that A-RLP is a safe and effective treatment technique for horses with no major adverse effects.
• However, the study also underscores that horses with synovial structure infections have a lower survival rate than those with acute, minimally contaminated intrasynovial lacerations, indicating a greater risk associated with this specific condition.
• Ultimately, the research suggests A-RLP is a viable treatment option with mostly positive outcomes, though further research could help identify why horses with septic synovitis have lower survival rates and how to improve these outcomes.