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Postoperative color flow duplex scanning in aortic endografting
P Heilberger1, C Schunn, W Ritter
1Department of Vascular Surgery, Klinikum Nürnberg Süd, Germany.
Summary
Duplex sonography with contrast is a reliable tool for aortic endograft surveillance, comparable to CT scans. However, it may miss stent fractures and can be hindered by bowel gas.
Area of Science:
- Vascular Surgery
- Medical Imaging
- Diagnostic Ultrasound
Background:
- Endovascular aortic repair (EVAR) requires lifelong surveillance.
- Computed tomography (CT) is the current standard for EVAR follow-up.
- Alternative, less invasive surveillance methods are needed.
Purpose of the Study:
- To assess the feasibility and sensitivity of duplex sonography compared to CT for aortic endograft surveillance.
- To evaluate the effectiveness of contrast-enhanced duplex sonography in detecting endoleaks.
Main Methods:
- A prospective study of 113 patients undergoing EVAR over 26 months.
- Follow-up surveillance using both contrast-enhanced CT and duplex sonography with an ultrasound contrast agent (Levovist).
- Comparison of diagnostic accuracy between the two imaging modalities.
Main Results:
- Duplex sonography detected 16 primary and 5 secondary endoleaks in tube grafts.
- Contrast-enhanced duplex identified 3 of 5 retrograde side-branch perfusion endoleaks missed by non-contrast methods.
- Graft limb thrombosis was clearly identified by duplex; however, 2 stent fractures were missed.
Conclusions:
- Duplex sonography, particularly with contrast agents, is a valuable, reliable, and economical surveillance tool for EVAR.
- Its sensitivity for endoleak detection is comparable to contrast-enhanced CT.
- Limitations include potential inability to detect stent fractures and interference from bowel gas.