Portal vein embolization (PVE) is a preoperative interventional procedure used to redirect portal venous blood flow away from a segment of liver planned for surgical resection, with the goal of inducing compensatory hypertrophy in the portion of liver that will remain. This overview introduces the clinical rationale and general procedural concepts relevant to interventional and hepatobiliary surgical teams.
What Is the Clinical Rationale for PVE?
Major liver resections carry a risk of post-hepatectomy liver failure if the remaining liver tissue, known as the future liver remnant (FLR), is insufficient to support adequate hepatic function after surgery. PVE is designed to address this concern by occluding portal venous branches supplying the liver segments planned for removal.
Once these branches are embolized, portal blood flow is redirected toward the future liver remnant, which is intended to stimulate compensatory hypertrophy—an increase in the size and functional capacity of the remaining liver tissue—over a period of several weeks before the planned resection.
How Is Candidacy for PVE Generally Assessed?
Candidacy for PVE is determined by the hepatobiliary surgical and interventional team based on volumetric imaging assessment. Cross-sectional imaging, typically CT, is used to calculate the estimated future liver remnant volume relative to total liver volume, informing the team's judgment about whether the FLR is likely to be adequate for safe resection or whether PVE-induced hypertrophy may be warranted first.
What Embolic Materials Are Used in PVE?
Several embolic material categories are discussed in the PVE literature, and material selection is determined by the treating interventional physician based on institutional protocol and case-specific factors:
- Particles or microspheres, sometimes combined with coils for more proximal, larger-vessel occlusion.
- Liquid embolic agents, which may be used in select approaches for more distal or complete vascular occlusion.
- Coils or vascular plugs, often used to occlude larger, more proximal portal branches.
Selective catheterization of portal vein branches is typically achieved via a percutaneous transhepatic approach, requiring appropriately sized microcatheters and guidewires compatible with the chosen embolic material.
What Follow-Up Is Typically Involved?
After PVE, patients are generally monitored with follow-up cross-sectional imaging to reassess future liver remnant volume and confirm adequate hypertrophy has occurred before proceeding to surgical resection. The interval between PVE and planned surgery varies by institutional protocol and individual hypertrophy response. As with all embolization procedures, PVE carries inherent procedural risks, and its appropriateness is determined on a case-by-case basis by the treating physician team.
Frequently Asked Questions
How long after PVE is surgery typically planned?
The interval varies by institutional protocol and the rate of liver hypertrophy observed on follow-up imaging, and is determined by the treating surgical and interventional team based on individual response.
Is PVE performed on all patients undergoing major liver resection?
No. PVE is generally reserved for cases where volumetric assessment suggests the future liver remnant may be insufficient without preoperative intervention. This determination is made by the treating hepatobiliary and interventional team.
What access route is typically used for PVE?
A percutaneous transhepatic approach is commonly used to access the portal venous system for embolization, though the specific technique depends on institutional protocol and individual patient anatomy as determined by the treating physician.
Related INVAMED Resources
- Embolization Products at INVAMED
- LIBRO Non-Adhesive Embolization Agent
- MicroCATH Neurovascular Catheter Family
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