Portal hypertension in chronic hepatitis: relationship to morphological changes

Area of Science:

• Hepatology and Gastroenterology
• Vascular Biology
• Pathology

Background:

• Portal hypertension is a critical complication of liver disease, characterized by elevated pressure in the portal venous system.
• Understanding the anatomical factors contributing to portal hypertension is crucial for managing liver disease progression.

Purpose of the Study:

• To investigate various anatomical factors that may passively impede portal venous flow and cause portal hypertension.
• To correlate these factors with the severity of liver disease and the development of portal hypertension.

Main Methods:

• Measurement of wedged hepatic venous pressure gradient (WHVPG) in cirrhotic and non-cirrhotic patients.
• Morphological assessment including semiquantitative grading of disease severity.
• Electron microscopy to evaluate hepatocyte size, and volume density of hepatocytes, sinusoids, Disse's space, and Disse's space collagen.

Main Results:

• WHVPG increased with disease progression; portal hypertension was detected before histological cirrhosis.
• Hepatocyte size significantly correlated with WHVPG increase in both alcoholic and non-alcoholic patients.
• Increased Disse's space collagen was observed in non-alcoholic chronic active hepatitis; no significant sinusoidal space reduction found.

Conclusions:

• Portal hypertension can precede detectable cirrhosis, driven by multiple interacting anatomical factors.
• Hepatocyte hypertrophy and increased Disse's space collagen are significant contributors to portal hypertension.
• No single anatomical feature solely determines portal hypertension; a multifactorial etiology is implicated.