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Graft patency evaluation with colour-Doppler ultrasonography after bypass surgery in Takayasu's arteritis: a direct
R O Raninen1, M S Pamilo, K T Leirisalo-Repo
1Department of Diagnostic Radiology, Helsinki University Central Hospital, Finland.
Insights
Colour-Doppler flow imaging (CDFI) shows promise for detecting complications in supra-aortic vascular bypass grafts for Takayasu's arteritis (TA). While effective for stenoses and occlusions, limited visibility can cause false results, suggesting CDFI as a potential follow-up tool.
Area of Science:
- Vascular Surgery
- Diagnostic Imaging
- Rheumatology
Background:
- Takayasu's arteritis (TA) often necessitates supra-aortic vascular bypass grafts.
- Monitoring these grafts for complications like stenosis and occlusion is crucial.
Purpose of the Study:
- To evaluate the feasibility and diagnostic utility of Colour-Doppler flow imaging (CDFI).
- To detect complications in supra-aortic vascular bypass grafts in patients with TA.
Main Methods:
- A prospective study involving six patients with TA and nine supra-aortic grafts.
- CDFI was used to measure graft lumen diameters and assess stenoses, occlusions, and dilatations.
- Findings were compared with conventional angiography.
Main Results:
- CDFI demonstrated 75% sensitivity and 100% specificity for detecting stenoses (>50%) and occlusions.
- One 40% stenosis was missed, and the maximal difference in stenosis measurement between CDFI and angiography was 20%.
Conclusions:
- CDFI is generally capable of detecting stenoses in supra-aortic grafts.
- Limited graft visibility can lead to inaccuracies.
- CDFI may replace some angiographic procedures and serve as a suitable follow-up method for asymptomatic patients.
Objectives:
To assess the feasibility and potential diagnostic usefulness of colour-Doppler flow imaging (CDFI) to detect complications of supra-aortic vascular bypass grafts in Takayasu's arteritis (TA).
Design:
A prospective study.
Materials:
Nine supra-aortic grafts in six patients with Takayasu's arteritis.
Methods:
The minimal, maximal, and true colour-flow image diameters of the lumens of the grafts were measured and stenoses, occlusions, and dilatations were evaluated and compared with angiographic findings.
Results:
The sensitivity for detection in > 50% stenoses and in total occlusions was 75% while specificity was 100%. Only one 40% stenosis had been overlooked in whole. The maximal difference of stenosis by two methods was otherwise 20%.
Conclusions:
CDFI was in general able to expose stenoses in supra-aortic grafts, but the lack of visibility of some grafts throughout their length cause the false results. It appears that some angiographies can be replaced by CDFI and that this is a suitable method for follow-up in symptom-free patients with grafts.