Abomasal fistulas in dairy cows

Area of Science:

• Veterinary Surgery
• Bovine Medicine
• Gastroenterology

Background:

• Abomasal fistulas are a rare but serious complication following surgical procedures.
• Previous abomasopexy techniques, including right paramedian abomasopexy (RPA) and percutaneous abomasopexy (BSA), have been implicated.
• Fistulas can develop weeks to months after the initial surgery, draining blood and ingesta.

Purpose of the Study:

• To describe the surgical correction of abomasal fistulas in adult Holstein cows.
• To identify potential causes and risk factors associated with abomasal fistulation.
• To report the outcomes of surgical intervention for abomasal fistulas.

Main Methods:

• Surgical resection of abomasal fistulas in 9 adult Holstein cows.
• Review of surgical history, including previous abomasopexy procedures (RPA, BSA).
• Surgical intervention timing varied based on hemorrhage severity and patient stability.
• Anesthetic protocols included general anesthesia (7 cows) and local anesthesia (2 cows).

Main Results:

• Fistulas were located in the right paramedian area, associated with necrotic abomasal or ruminal tissue.
• Successful surgical outcomes were achieved in 7 of the 9 cows discharged.
• The time from initial surgery to fistula development ranged from 2 weeks to 12 months.

Conclusions:

• Abomasal fistulation is likely associated with the use of nonabsorbable sutures during abomasopexy.
• Suture penetration into the abomasal lumen can lead to infection and subsequent fistula formation.
• Surgical resection is a viable treatment option with a good prognosis for successful outcomes.