AASLD–AST Guideline on Adult Liver Transplant Candidate Evaluation

The AASLD–AST Guideline on Adult Liver Transplant Candidate Evaluation provides a comprehensive, evidence-based framework for assessing patients who may benefit from liver transplantation. This updated guideline, developed by a multidisciplinary expert panel, reflects advancements in transplantation medicine, evolving patient populations, and ethical considerations since the previous 2005 guidance. It emphasizes equity, utility, and improving patient outcomes while ensuring consistent and transparent practices across transplant centers.

### Key Highlights of the Guideline:

#### 1. **Indications for Referral to a Transplant Center**

• **Decompensated Cirrhosis**: Patients with liver disease complications such as ascites, variceal bleeding, or hepatic encephalopathy should be referred.
• **Acute-on-Chronic Liver Failure (ACLF)**: These patients should be considered for evaluation due to their high risk of mortality.
• **Acute Liver Failure (ALF)**: This condition requires **urgent referral** to a transplant center due to its rapid progression and life-threatening nature.
• **Hepatocellular Carcinoma (HCC)**: Patients with liver cancer, particularly those within transplant criteria (e.g., Milan criteria), are candidates for evaluation.
• **Select Cholangiocarcinoma Cases**: Patients with early-stage cholangiocarcinoma may also be considered for transplantation.
• **Portal Hypertensive Complications or Quality-of-Life Impairment**: Even in cases with low MELD (Model for End-Stage Liver Disease) scores, these factors should prompt consideration for referral.

#### 2. **Principles of Candidate Evaluation**

• The evaluation process focuses on:
• **Prognosis Without Transplantation**: Assessing the likelihood of survival without a transplant.
• **Post-Transplant Benefit**: Determining the potential for improved survival and quality of life after transplantation.
• **Patient Preferences**: Incorporating the patient’s values, preferences, and goals of care into the decision-making process.
• A **comprehensive multidisciplinary approach** is strongly recommended for evaluating candidates.

#### 3. **Components of the Evaluation Process**

The guideline recommends a thorough, multidisciplinary assessment to optimize outcomes:

• **Cardiopulmonary Assessment**: Evaluating cardiovascular and pulmonary health to ensure suitability for surgery and recovery.
• **Infection Screening**: Identifying and managing potential infections that could complicate transplantation.
• **Cancer Surveillance**: Screening for malignancies to ensure they are within transplantable criteria.
• **Nutrition and Frailty Assessment**: Evaluating nutritional status and physical frailty, as these factors can influence transplant outcomes.
• **Bone Health**: Assessing for osteoporosis or other bone conditions that may impact recovery.
• **Dental Health**: Ensuring oral health to minimize the risk of post-transplant infections.
• **Psychosocial Assessment**: Addressing mental health, substance use disorders, social support, and adherence potential.

#### 4. **Addressing Potential Contraindications**

• The guideline emphasizes that certain conditions are **not absolute contraindications** to transplantation, provided the associated risks are managed effectively:
• **Frailty**: While frailty is a risk factor, it is not an exclusion criterion if interventions can improve the patient’s condition.
• **Mental Health Disorders**: These should be evaluated and treated but are not a reason to deny transplantation.
• **Substance Use Disorders**: Patients with a history of substance use can be considered if they demonstrate sustained recovery and adherence potential.
• **Extremes of BMI**: Obesity or underweight status should not automatically disqualify patients, though weight optimization may be necessary.

#### 5. **Goals of the Guideline**

• Standardize the evaluation process across transplant centers to ensure consistency.
• Optimize patient outcomes by identifying the most appropriate candidates.
• Reduce disparities in access to liver transplantation.
• Support informed decision-making for both patients and healthcare providers.

### Summary

The AASLD–AST guideline serves as a practical and ethical framework for evaluating adult liver transplant candidates. It stresses the importance of timely referral, comprehensive multidisciplinary evaluation, and addressing modifiable risk factors. By prioritizing equity and patient benefit, the guideline aims to improve outcomes and ensure fair access to this life-saving therapy.