Effects of postoperative peritoneal lavage on pharmacokinetics of gentamicin in horses after celiotomy.

The research studied the impact of postoperative peritoneal lavage on the pharmacokinetics of gentamicin in healthy horses after undergoing celiotomy. It concluded that the peritoneal lavage didn’t alter the pharmacokinetics of gentamicin, therefore, there was no need for any dosage adjustments to maintain predictable serum concentrations of the drug.

Explanation of The Research Paper

Objective and Methodology

• The primary objective of the study was to determine whether postoperative peritoneal lavage influenced the pharmacokinetics of gentamicin sulfate in healthy horses after they underwent an experimental celiotomy. Celiotomy is a surgical operation that opens the abdominal cavity.
• A total of 13 clinically healthy horses were used in the study. These horses were assigned randomly to either control or experimental groups.
• All horses received a preoperative dose of gentamicin (an antibiotic used for several bacterial infections) before the surgery. In addition to the surgery, the horses also had abdominal drains placed percutaneously.
• In the postoperative phase, horses in the experimental group received peritoneal lavage – a process where the peritoneal cavity is washed out with a solution – unlike the control group. The day after surgery or 24 hours after the preoperative dose of gentamicin, a second dose of gentamicin was given.
• At specific intervals during the 24-hour period after the second dose of gentamicin, venous blood samples were collected for determining the concentration of gentamicin.

Results

• The results of the study indicated that there were no differences in any of the pharmacokinetic values of gentamicin between the control group and the experimental group of horses. Basically, the pharmacokinetics of gentamicin (how the body absorbs, distributes, metabolizes, and excretes the drug) was not affected by postoperative peritoneal lavage.

Conclusions

• Based on the findings, the researchers concluded that postoperative peritoneal lavage had no effect on the pharmacokinetics of gentamicin in healthy horses after abdominal surgery, where localized nonseptic peritonitis (inflammation of the peritoneum) was induced.
• This suggests that when peritoneal lavage is performed in horses with localized nonseptic peritonitis or for preventing intra-abdominal adhesions (fibrous bands that form between tissues and organs often as a result of injury during surgery), there is no need to alter the dosage of gentamicin to maintain predictable serum concentrations. This helps ensure that the effectiveness of the drug isn’t compromised.