Research on Using Small-for-size Grafts for Auxiliary Liver Transplantation in the Treatment of Portal Hypertension

Inclusion Criteria: 1. Age \> 14 years. 2. Presence of decompensated portal hypertension. 3. Meeting the indications for liver transplantation surgery. 4. International Normalized Ratio (INR) \< 2.4. 5. Scheduled to undergo orthotopic auxiliary partial liver transplantation or conventional liver transplantation. Exclusion Criteria: 1. Rare liver-related anatomical variations. 2. Presence of contraindications to liver transplantation combined with malignant tumors. 3. Grade III or higher portal vein thrombosis. 4. Severe systemic diseases unrelated to the etiology or complications of portal hypertension. 5. Special surgical procedures such as dual-graft liver transplantation. 6. Special graft sources including domino liver transplantation. 7. Liver re-transplantation.