Laparoscopic techniques for investigating the equine oviduct.

This research article is about developing and testing two laparoscopic surgical approaches for diagnosing and treating oviduct disorders in mares. It concludes that the flank approach was more successful than the transvaginal approach for oviductal flushing.

Objective and Methodology

• The study was aimed at developing a laparoscopic technique for diagnosing and treating oviduct disorders in mares. Instead of the traditional methods, which involve exploratory surgery under general anesthesia or flank laparotomy, the researchers proposed using laparoscopic techniques in the standing sedated mare.
• Two methods were tested: a transvaginal laparoscopic approach and a laparoscopic flank approach. Both involved catheterization of the infundibulum and flushing of the oviduct using a sterile methylene blue solution.
• The success of these methods was evaluated by visualizing the infundibulum and the oviductal ampulla, and by confirming the passage of fluid into the uterus via post-operative hysteroscopy.

Results

• During the first experiment (transvaginal laparoscopic approach), visualizing the infundibulum proved possible in most cases, but the olive-shaped opening at the abdominal end (ostium) of the oviduct could not be seen or catheterized. Also, the wider part of the oviduct (ampulla) could only be seen in less than half of the cases.
• In the second experiment (laparoscopic flank approach), researchers were successful in catheterizing the ampulla in the majority of cases, and in nearly half of these cases, it was confirmed that the injected fluid reached the uterus.

Conclusions

• The researchers concluded that the transvaginal laparoscopic approach was not suitable for oviductal flushing in mares as it did not allow for sufficient visualization or catheterization.
• On the other hand, the laparoscopic flank approach was deemed successful in studying and flushing the oviduct, offering a potential new method for diagnosing and treating oviduct disorders.
• This method also presents a minimally invasive technique for collecting young embryos or transferring gametes in Gamete Intrafallopian Transfer (GIFT) procedures.