Effect of gentamicin sulfate and sodium bicarbonate on the synovium of clinically normal equine antebrachiocarpal joints.

This research investigates the impact of gentamicin sulfate, both unbuffered and buffered with sodium bicarbonate, on the synovial fluid and membrane in healthy horse joints. After administering treatments to six groups of horses, scientists found that although initial synovial fluid pH levels dropped following an intra-articular gentamicin administration, they returned to close to normal levels within a certain time frame.

Research Context and Methodology

• The study was conducted to understand how gentamicin sulfate affects synovial fluid and membranes in the joints of horses. Gentamicin sulfate was tested both unbuffered and when buffered with sodium bicarbonate. Understanding these effects could help in exploring new treatment possibilities for joint diseases in horses.
• A total of thirty-six adult horses, all with clinically normal antebrachiocarpal joints, were divided into six treatment groups, each comprising six horses.
• Each horse had one antebrachiocarpal joint selected for treatment. The six groups received different treatments: gentamicin, sodium bicarbonate, a combination of gentamicin and sodium bicarbonate, no treatment, and two groups were given polyionic physiological solution in different quantities.
• Samples of synovial fluid were collected from five horses in each group, and these samples were analysed at various post-injection hours (PIH). The sixth horse from each group was euthanized at PIH 24 for a more detailed examination of the joint’s synovial membrane.

Research Findings

• The results showed that after an intra-articular gentamicin administration, the mean synovial fluid pH was lowest (5.98) at PIH 0.25. However, by PIH 8, it was not significantly different from the control value which was taken from group-5 horses that were given a polyionic physiological solution.
• The study also found that when sodium bicarbonate was combined with gentamicin before intra-articular administration, the mean synovial fluid pH was lowest (7.07) at PIH 0.25. But by PIH 1, it was not significantly different from the control value taken from the group-6 horses.
• The abstract ends at this point, likely indicating that there is more detailed information in the full text of the research paper itself, such as the implications these findings have for veterinary medicine and potential treatments for equine joint diseases.