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Updated: May 17, 2026
Heterotopic Auxiliary Rat Liver Transplantation With Flow-regulated Portal Vein Arterialization in Acute Hepatic Failure
Published on: September 13, 2014
Portal vein pressure and flow modulation in pediatric liver transplantation
Seisuke Sakamoto1, Seiichi Shimizu1, Hajime Uchida1
1Organ Transplantation Center, National Center for Child Health and Development, Tokyo, Japan.
Insights
Pediatric liver transplantation (LT) requires careful portal vein assessment. A portal vein pressure (PVP) of ≥25 mmHg before graft implantation may indicate sufficient portal vein flow (PVF) for successful outcomes.
Area of Science:
- Hepatobiliary Surgery
- Pediatric Transplantation
- Vascular Reconstruction
Background:
- Liver transplantation (LT) is increasingly performed in smaller, sicker pediatric patients, often with biliary atresia (BA).
- BA patients frequently present with portal hypoplasia and sclerotic portal veins (PV), complicating PV reconstruction.
- Intraoperative PV thrombosis is a critical complication, necessitating precise pre- and intraoperative PV assessment.
Purpose of the Study:
- To identify objective parameters for assessing sufficient portal vein flow (PVF) before pediatric LT graft implantation.
- To evaluate the utility of portal vein pressure (PVP) as an indicator of adequate PVF in pediatric LT.
- To guide graft inflow modulation (GIM) strategies to prevent hypoperfusion in pediatric LT.
Main Methods:
- Review of PV structure and PVF assessment using radiological imaging.
- Analysis of PVP and PVF data, primarily from adult living donor LT studies.
- Proposal of PVP as a potential objective parameter for GIM in pediatric LT.
Main Results:
- A portal vein pressure (PVP) of ≥25 mmHg before graft implantation was proposed as an objective parameter for achieving sufficient PVF.
- A cutoff value of 50 mL/min/100 g of graft weight was suggested for adequate PVF.
- Current GIM strategies in pediatric LT focus on preventing hypoperfusion and involve collateral vessel management and PV reconstruction techniques.
Conclusions:
- Objective parameters are needed to ensure sufficient PVF before pediatric LT graft implantation.
- PVP ≥25 mmHg may serve as a reliable indicator of adequate PVF (≥50 mL/min/100 g) in pediatric LT.
- Further research is required to optimize PV reconstruction strategies for successful pediatric LT.
Abstract:
Liver transplantation (LT) has been indicated for smaller and more clinically severe patients in recent years. Small biliary atresia (BA) patients often show portal hypoplasia and sclerotic portal vein (PV), which may make PV reconstruction more difficult during the operation. Among PV complications, intraoperative PV thrombosis can be considered a disaster, and it is important to prevent this catastrophic event by the precise assessment of the PV structure and PVF using radiological imaging before and during LT. However, there are no objective parameters to indicate whether sufficient PVF can be obtained. PV pressure (PVP) and PV flow (PVF) have mainly been studied in adult living donor LT, for the purpose of preventing small-for-size syndrome, and PVP has been considered an objective parameter of graft inflow modulation (GIM). In the setting of pediatric LT, GIM is mainly performed to prevent hypoperfusion, and it must be performed before graft implantation. GIM to maximize the PVF of pediatric patients with potentially low PVF in LT consists of the interruption of collateral vessels, the assessment of the usability of the native PV, and technical modifications in PV reconstruction. Reliable objective parameters that represent sufficient PVF before graft implantation are desired. Our recent study proposed that a PVP of ≥25 mmHg before graft implantation can be considered an objective parameter to obtain sufficient PVF (cutoff value: 50 mL/min/100 g of graft weight). Further investigation is needed to determine the best strategy for successful PV reconstruction in pediatric LT.
