Regional perfusion of the equine carpus for antibiotic delivery.

The study assesses the delivery of antibiotics to horse’s carpal tissues via regional perfusion of intramedullary fluids. The findings demonstrate that the perfusion can effectively deliver antibiotics to the targeted area through the venous system, which allows for better localized treatment of infections.

Research Methodology

• The study was conducted on 10 horses to evaluate the efficacy of regional perfusion, which involves the administration of fluids into the carpal tissues. These fluids are typically loaded with therapeutic agents like antibiotics.
• The research uses tools such as subtraction radiography, which they used after performing perfusion with a contrast medium. This medium helps to confirm the delivery of the perfusion fluid to the correct target area via the venous system.
• The distribution of the perfusate was investigated using India ink, which was observed to be uniformly spread into the antebrachiocarpal and middle carpal synovial membranes.

Research Findings

• Once the perfusion fluid was successfully delivered, it was found within the venules of the synovial villi. This shows the proper distribution of the perfusate into the target tissues.
• Gentamicin sulfate, a widely used antibiotic, was used to measure the antibiotic concentration post-perfusion. Immediate perfusion yielded high concentrations in the synovial fluid and synovial membrane of the antebrachiocarpal joint.
• Concentration levels of the antibiotic were also measured at regular intervals after perfusion and found to peak in the synovial fluid approximately half an hour after delivery.
• However, 24 hours post-perfusion, the gentamicin concentration had significantly decreased in the synovial fluid, but still remained at a notable level. This data helps show how long antibiotics stay in the system and are effective in infection control.
• By understanding the serum gentamicin concentration curve, it can be determined when subsequent doses should be given to maintain effective antibiotic levels in the carpal tissues of the horse. This is significant because it informs appropriate dosage intervals to ensure the infected area maintains crucial antibiotic levels.

In conclusion, the research demonstrates the feasibility and benefits of regional perfusion of antibiotics in horses for enhanced target-specific delivery via the venous system.