A new surgical model for hepatectomy in pigs

Area of Science:

• Surgical innovation in animal models
• Hepatic research and acute liver failure simulation

Background:

• Anhepatic animal models are crucial for acute liver failure research.
• Traditional hepatectomy in pigs requires extracorporeal bypass due to vena cava resection, often leading to circulatory compromise and reduced survival.

Purpose of the Study:

• To develop and evaluate a new surgical technique for total hepatectomy in pigs.
• To assess the safety, efficacy, and impact on circulatory stability during anhepatic procedures.

Main Methods:

• A Y-shaped bypass was surgically implanted in 20 female pigs prior to en bloc hepatectomy.
• The technique involved specific anastomoses to manage vena cava and portal vein flow.
• Vessels were only partially clamped to maintain continuous blood flow.

Main Results:

• The novel technique ensured constant blood flow and prevented venous stasis during and after hepatectomy.
• Hemodynamic parameters, including heart rate and blood pressure, remained stable throughout the procedure.
• Postoperative survival was 100% at 12 hours, with a mean survival of 51.2 hours, though all animals eventually succumbed to multiple organ failure.

Conclusions:

• The described surgical technique is safe, easy to perform, and facilitates total hepatectomy.
• It allows for minimal blood loss and maintains stable circulation without extracorporeal bypass.
• This method offers a significant advancement for anhepatic animal models in liver failure research.