Aortic stent-grafts: Endoleak surveillance

Area of Science:

• Medical Imaging
• Vascular Surgery
• Radiology

Background:

• Endoleaks are the most frequent complication following endovascular aortic aneurysm repair (EVAR).
• Persistent endoleaks can increase pressure within the aneurysm sac, risking rupture.
• Current follow-up relies heavily on computed tomography (CT), which involves radiation and contrast agents.

Purpose of the Study:

• To evaluate alternative imaging techniques for endoleak detection post-EVAR.
• To explore methods for reducing radiation exposure during aneurysm repair follow-up.
• To assess the feasibility of new follow-up protocols incorporating non-ionizing imaging.

Main Methods:

• Review of current follow-up practices for EVAR.
• Discussion of limitations of computed tomography (CT) in endoleak surveillance.
• Exploration of contrast-enhanced ultrasound (CEUS) and magnetic resonance (MR) imaging as alternatives.
• Analysis of proposed alternative follow-up protocols combining CT and CEUS.

Main Results:

• CT is the gold standard but has drawbacks including radiation and contrast exposure.
• CEUS and MR imaging offer potential alternatives or complementary roles to CT.
• New protocols suggest CT at 1 month and 1 year, followed by CEUS, may be viable.
• Stent-graft integrity verification still necessitates CT imaging.

Conclusions:

• Reducing radiation exposure in EVAR follow-up is crucial.
• CEUS and MR imaging show promise in supplementing or replacing CT in specific scenarios.
• Patient-specific, risk-adjusted follow-up protocols are increasingly important for optimizing EVAR surveillance.