Simulation of prehepatic portal hypertension and impact of hepatic deportalization on its tissue

Objective. On the prehepatic portal hypertension pattern, created by partial ligature of venae portae in rats, to estimate the impact of partial hepatic deportalization on its tissue. Materials and methods. The investigation was conducted on 35 male rats of a Wistar line, aged 4–6 weeks. In 15 laboratory animals the partial ligature of vena porta with formation of stenosis was conducted, and in 15 –false ligature, while the control group consisted of 5 intact laboratory animals. Results. There were revealed certain connections between conduction of partial ligature of vena porta and critical (lethal) lowering of portohepatic perfusion. The model of prehepatic portal hypertension, using partial ligature of vena porta, leading to partial lowering of portohepatic perfusion with development of cavernous transformation of vena porta and dystrophic changes in hepatocytes with further fibrous changes in hepatic parenchyma, was applied. Conclusion. The portal vein narrowing grade in range 52 – 59% constitutes the optimal one for the prehepatic portal hypertension formation with development of zonal adipose parenchymatous hepatic dystrophy and the balloon degeneration of hepatocytes with further development of fibroses in rats of a Wistar line aged 4 – 6 weeks.