Non-contrast fresh-blood MRA for assessment of abdominal endovascular stent grafts
KeywordsAbdominal Aortic Aneurysm Abdominal Aortic Aneurysm Abdominal Aortic Aneurysm Repair Black Blood Bright Blood
Serial imaging of abdominal aortic endovascular stent grafts (AA-ESG) is done in order to determine: 1) stent stability, 2) presence of endograft leak, and 3) residual abdominal aortic aneurysm (AAA) sac size. CT angiography (CTA) has traditionally been used for serial follow-up. Given the high incidence of renal dysfunction in patients with AAA and potential contraindications to both CT and MR contrast agents we development a non-contrast vascular imaging protocol for assessment of patients with AA-ESG.
Consecutive patients are reported on (n = 5): 73 ± 4 yo, 45 ± 16 months since AAA repair (mean ± SD). Aneurysm dimension at its greatest size as assessed by CTA (3.9 ± 0.1 cm) was similar to that for BB imaging (3.8 ± 0.1 cm) (p = 0.40). Endograft visualization as assessed by luminal dimensions was similar between FBI and CTA (r2 = 0.96, n = 15) with good visualization of the AA-ESG and surrounding arterial tree.
A combined approach of 2D BB and 3D FBI imaging of AA-ESG can accurately assess aneurysm sac size and endograft angiographic characteristics. Although this non-contrast technique cannot directly assess for endograft leak this approach may still be an acceptable alternative to contrast imaging for serial follow-up of patients with renal dysfunction. Further validation of this novel technique will need to be done in a larger cohort of patients.
This article is published under license to BioMed Central Ltd.