Small-for-size graft in liver transplantation

Area of Science:

• Hepatobiliary Surgery
• Transplantation Medicine
• Gastroenterology

Background:

• Living donor liver transplantation (LDLT) for adults faces challenges with small-for-size (SFS) grafts.
• The definition and clinical impact of SFS syndrome are debated, with variability in 'normal' liver weight and extrahepatic factors.
• The rapid regeneration capacity of the liver is acknowledged but has limitations.

Purpose of the Study:

• To re-evaluate the significance of small-for-size (SFS) grafts in adult living donor liver transplantation.
• To identify key contributing factors to SFS syndrome beyond mere graft weight.
• To inform clinical decision-making regarding the use of SFS grafts in liver transplantation.

Main Methods:

• Review of clinical features and outcomes associated with SFS grafts in liver transplantation.
• Analysis of factors influencing SFS syndrome, including graft weight and portal hemodynamics.
• Consideration of ongoing clinical trials focusing on surgical and pharmacological interventions.

Main Results:

• Clinical manifestations of SFS syndrome are not specific to low graft weight and can be influenced by multiple factors.
• Early elevation of portal venous pressure is identified as a highly probable critical factor in SFS syndrome.
• Graft weight alone may not be the sole determinant of SFS syndrome development.

Conclusions:

• An excessive fear of small-for-size (SFS) grafts in liver transplantation may be unwarranted.
• Focusing on factors like portal hemodynamics and tissue congestion is crucial for managing SFS syndrome.
• Minimizing unnecessary transplantation withdrawals due to SFS concerns is recommended, given potential interventions.