Published in:
01-05-2010 | Vascular-Interventional
MRI after implantation of a novel femoral closure device following intra-arterial catheterisation: implications for subsequent contrast-enhanced MR angiography
Published in: European Radiology | Issue 5/2010
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Objective
To assess MRI safety aspects and artefacts of a novel femoral artery closure device during contrast-enhanced MR angiography in patients following intra-arterial catheterisation.
Methods
Ten consecutive patients underwent MRI within 24 h of coronary angiography and placement of a femoral artery closure device. We used a T2-weighted gradient-echo MRI sequence to measure the device-related artefact size in comparison with a phantom image, phase-contrast flow measurement proximal to, at the level of and distal to the device to quantify potential differences in flow velocity and contrast-enhanced 3D gradient-echo MR angiography to differentiate potential femoral artery stenosis from device-related artefacts.
Results
The mean size of the oval-shaped artefact was 8.4 × 6.6 mm (±1.0 × 0.8 mm) and was almost identical to the maximum artefact size of the phantom measurement (8.3 × 5.7 mm). Device placement did not result in an increased peak velocity (proximal 69 ± 23 cm/s, at the level of 64 ± 11 cm/s and distal to the device 63 ± 12 cm/s, p = 0.67). The mean artefact penetration into the vessel lumen was 0.5 ± 0.5 mm (percentage vessel narrowing 7.0 ± 6%; range 0–16%).
Conclusion
The MR conditional StarClose femoral artery closure device was used safely within 24 h of deployment at 1.5 T. Despite clip-related artefacts MR angiography will allow for easy differentiation of clip-related artefacts from high-grade atherosclerotic stenosis.