Resectability and regeneration of liver in postsinusoidal block

Area of Science:

• Hepatology
• Surgical Research
• Liver Physiology

Background:

• Liver cirrhosis in humans primarily involves postsinusoidal block, sometimes with coexisting presinusoidal block.
• Understanding liver resectability and regeneration is crucial for managing cirrhotic liver disease.

Purpose of the Study:

• To investigate the resectability and regeneration of cirrhotic livers under different block conditions.
• To compare hemodynamic changes and liver remnant growth after partial hepatectomy in models of presinusoidal and postsinusoidal block.

Main Methods:

• Dogs with induced presinusoidal block (portal vein ligation) or postsinusoidal block (hepatic vein ligation post-portacaval anastomosis) underwent partial hepatectomy.
• Hemodynamic changes, remnant liver weight, and histometric regeneration were analyzed.

Main Results:

• Resectability was higher with presinusoidal block (50%) than postsinusoidal block (<30%).
• Liver remnant weight and regeneration were significantly greater in the dual blood supply model compared to postsinusoidal and presinusoidal blocks.
• Postsinusoidal block showed greater regenerative capacity but lower resectability than presinusoidal block.

Conclusions:

• Liver resectability in cirrhosis is more dependent on functional reserve than regenerative capacity.
• Postsinusoidal block significantly impairs liver functional reserve, limiting surgical options.
• Regenerative capacity is inversely related to the severity of the block in cirrhotic models.