Umbilical vein marsupialization in foals-short literature review.

Overview

• This research review discusses umbilical vein marsupialization as a surgical treatment for complicated umbilical infections in newborn foals.
• It highlights indications, surgical techniques, perioperative care, and outcomes associated with this procedure, which is used when infections extend deeply or are resistant to standard treatment.

Umbilical Remnant Infections in Foals

• Commonly affect newborn foals and may involve one or multiple umbilical components such as arteries, veins, and the urachus.
• Diagnosis includes a combination of:
  • Detailed clinical examination
  • Ultrasonography to assess the extent of infection
  • Hematologic tests to evaluate systemic involvement

Standard Treatment Approach

• Initial therapy typically involves broad-spectrum antibiotics targeting likely pathogens.
• Surgical removal (omphalectomy) is considered if medical management fails to resolve the infection.
• Complications arise if infection extends into the liver, notably omphalophlebitis (inflammation of the umbilical vein and associated hepatic tissue).

Indications for Umbilical Vein Marsupialization

• Performed when:
  • Safe ligation and cutting of the umbilical vein is not possible due to extensive infection.
  • Infection involves the hepatic parenchyma beyond the umbilical vein.
• Goals include:
  • Controlled drainage of the infected vein to prevent spread.
  • Minimizing intra-abdominal contamination during surgery.

Surgical Techniques

• Dorsal Recumbency Positioning: The foal is positioned on its back for surgical access.
• Fusiform Incision: A spindle-shaped cut around the umbilicus allows access to the infected structures.
• Resection Steps:
  • Ligation and transection of the umbilical arteries and urachus.
  • Partial cystectomy performed if infection spreads into the urinary bladder.
  • Mobilization of the umbilical vein cranially (towards the foal’s head).
• Cranial Midline Translocation:
  • The partially resected vein is incorporated into the abdominal wall closure along the midline.
  • Limits contamination but increases risk of:
    • Surgical site infection
    • Herniation through the incision
  • May require a second surgery to correct complications.
• Right Paramedian Translocation:
  • An additional incision is made beside the midline on the right side to exteriorize the umbilical vein.
  • The marsupialization site (stoma) heals by second intention (naturally from the bottom up).
  • Risk of contamination exists during vein exteriorization but can be mitigated with protective strategies.

Perioperative Management

• Broad-spectrum antibiotics are administered, ideally tailored based on culture and sensitivity results for targeted therapy.
• Wound care is critical to prevent infection and promote healing around the surgical sites.
• Some protocols include flushing the marsupialization stoma to maintain drainage and prevent blockage.

Prognosis and Outcomes

• Foals undergoing marsupialization generally have a less favorable prognosis compared to those treated with simple umbilical resection due to the severity of infection.
• Survival and long-term outcomes can still be positive in many cases with appropriate management.
• Because data in the literature are limited and heterogeneous, definitive conclusions about efficacy and risks are difficult to draw.

Conclusion

• Despite challenges, umbilical vein marsupialization remains a valuable surgical option for severe umbilical infections in foals, particularly when infection involves the liver or when ligation isn’t safe.
• Choosing the appropriate technique and diligent perioperative care are essential to optimize outcomes.