Cirrhosis is a major global cause of morbidity and mortality in chronic liver disease patients, accounting for 2.4% of global deaths in 2019. A 1990-2017 Global Burden of Disease study showed rising cirrhosis-related deaths, bringing heavy health and economic burdens. It often leads to portal hypertension and subsequent complications like ascites, gastroesophageal variceal bleeding (20% 6-week mortality), and hepatic encephalopathy (HE). Transjugular intrahepatic portosystemic shunt (TIPS) is an important treatment for variceal bleeding and refractory ascites per guidelines from EASL, AASLD, and the Chinese Medical Association.

Malnutrition affects 20% of compensated and over 50% of decompensated cirrhotic patients; sarcopenia (severe malnutrition) is linked to higher cirrhosis-related complications, impaired quality of life, survival, and poor prognosis in TIPS-treated patients. Thus, concurrent sarcopenia intervention during TIPS may improve outcomes.

Baveno VII, EASL, and AASLD guidelines recommend branched-chain amino acid (BCAA) and leucine-rich supplements for decompensated cirrhosis to ensure adequate nitrogen intake. RCT evidence shows BCAAs improve skeletal muscle index (SMI) in cirrhotic patients with sarcopenia and reduce HE risk, but evidence for TIPS-treated patients is lacking. This study aims to compare muscle mass changes and clinical prognosis between TIPS patients with sarcopenia, portal hypertension, and variceal bleeding who receive TIPS with or without BCAA supplements.

Cirrhosis is a major cause of morbidity and mortality among patients with chronic liver disease worldwide. In 2019, cirrhosis accounted for 2.4% of global deaths. A Global Burden of Disease study (1990-2017) showed that the number of deaths caused by cirrhosis has been on the rise year by year since 1990, imposing a severe health and economic burden on many countries and peoples around the world. Cirrhosis is usually accompanied by the development of portal hypertension, which further leads to complications such as ascites, gastroesophageal variceal bleeding, and hepatic encephalopathy (HE). Among these, the mortality rate of gastroesophageal variceal bleeding reaches as high as 20% within 6 weeks of onset. Currently, according to guidelines issued by the European Association for the Study of the Liver (EASL), the American Association for the Study of Liver Diseases (AASLD), and the Chinese Medical Association, transjugular intrahepatic portosystemic shunt (TIPS) has become an important treatment for variceal bleeding and refractory ascites.

Malnutrition is a common complication of cirrhosis, affecting 20% of patients with compensated cirrhosis and more than 50% of those with decompensated cirrhosis. Sarcopenia is generally regarded as severe malnutrition, and its occurrence is often associated with a higher risk of cirrhosis-related complications (such as hepatic encephalopathy, ascites, and infections), which seriously impairs patients' quality of life and survival. Several studies have shown that sarcopenia is associated with poor prognosis in cirrhotic patients undergoing TIPS treatment. Therefore, concurrent intervention for sarcopenia during TIPS treatment may improve prognosis and thus enhance patient survival.

The Baveno VII guidelines point out that malnutrition increases the risk of poor prognosis in patients with cirrhosis and acute variceal bleeding, and oral nutrition should be initiated as soon as possible. Both the EASL Clinical Practice Guidelines on Nutrition in Chronic Liver Disease and the AASLD Practice Guidance on Malnutrition, Frailty, and Sarcopenia in Patients with Cirrhosis recommend the use of branched-chain amino acid (BCAA) supplements and leucine-rich amino acid supplements in patients with decompensated cirrhosis to achieve adequate nitrogen intake. An RCT study demonstrated that BCAA supplements can improve the skeletal muscle index (SMI) in cirrhotic patients with sarcopenia. Additionally, evidence suggests that BCAA supplements can significantly reduce the risk of hepatic encephalopathy (HE).

Therefore, BCAA supplements may serve as a routine nutritional supplement for cirrhotic patients undergoing TIPS treatment, but relevant evidence is currently lacking. This study aims to compare changes in muscle mass and clinical prognosis between cirrhotic patients with portal hypertension and variceal bleeding complicated by sarcopenia who receive TIPS with or without BCAA supplements, so as to verify our hypothesis.

Inclusion Criteria:

1. Age between 18 and 80 years old;
2. Diagnosed with cirrhosis complicated by sarcopenia;
3. Patients admitted due to variceal bleeding or refractory ascites who meet the indications for transjugular intrahepatic portosystemic shunt (TIPS).

Exclusion Criteria:

1. Hepatocellular carcinoma and/or other malignant tumors;
2. Severe cardiopulmonary insufficiency;
3. Child-Pugh score > 13 points;
4. Spontaneous recurrent hepatic encephalopathy (HE);
5. Large spontaneous portosystemic shunt;
6. Sepsis; spontaneous bacterial peritonitis (SBP);
7. Allergy to any component of the study nutritional supplement;
8. High-energy and high-protein diet or use of calcium supplements, vitamin D supplements, or protein/amino acid supplements within 3 months prior to the study.

This study adopts a rigorous double-blind design to reduce bias, with specific implementations as follows: The placebo is prepared by an independent third-party institution not affiliated with the research team, and its appearance, odor, and packaging form are identical to those of the branched-chain amino acid (BCAA) supplement. It contains only inactive pharmaceutical excipients and has undergone safety evaluation, ensuring that the two cannot be distinguished by sensory characteristics; stratified block randomization is used for grouping: an independent third-party statistician generates a random allocation sequence via computer software (with gender and Child-Pugh classification as stratification factors and a dynamically adjusted block length of 4), and prepares sealed opaque envelopes to contain the grouping results. The envelopes are only opened by a research coordinator not involved in outcome assessment to confirm the grouping after the patient signs the informed consent form;