Classification of endoleaks in the follow-up after EVAR using the time-to-peak of the contrast agent in CEUS examinations
Issue title: Selected articles of the 14th International Congress of Biorheology and the 7th International Conference of Clinical Hemorheology, July 4–7, 2012, Istanbul, Turkey
Affiliations: Department for Clinical Radiology, Ludwig-Maximilians-University Hospital Munich-Grosshadern, Munich, Germany | Department of Surgery, Ludwig-Maximilians-University Hospital Munich-Grosshadern, Munich, Germany
Note: [] Corresponding author: Dirk André Clevert, MD, Associate Professor of Radiology, Department for Clinical Radiology, Ludwig-Maximilians-University Hospital Munich, Marchioninistrasse 15, 81377 Munich, Germany. E-mail: Dirk.Clevert@med.uni-muenchen.de Shared first-authorship.
Note: [] Shared first-authorship.
Abstract: PURPOSE: To evaluate the feasibility of the classification of endoleaks following endovascular aortic aneurysm repair using the time-to-peak of the contrast agent in CEUS examinations. MATERIAL AND METHODS: In this retrospective study, a cohort of 171 patients with a total of 489 CEUS follow-up examinations after EVAR were included. In 254 of the 489 examinations, an endoleak was seen and the time-to-peak was measured in seconds. Existence of an endoleak was confirmed by CT as the gold standard. RESULTS: We evaluated 254 CEUS video sequences showing an endoleak out of a total of 489 examinations. Kruskal-Wallis test revealed with p = 0.001 differences between the single endoleak types based on the time to peak. Correction after Bonferroni showed significant differences between type Ia compared to Ib and to IIa over inferior mesenteric artery (IMA) and IIa over lumbar artery (LA). There are also disparities between type Ib and type IIa IMA and type III, furthermore between type IIa IMA compared to IIa LA and type III as well as type IIa LA matched to type III. CONCLUSION: CEUS is an important method for the follow-up after EVAR. The time-to-peak does not seem to be a useful additional feature in classifying endoleaks, although there are differences between the time-to-peak of the single endoleak types and it is possible to make an order of the different endoleak types referring to the mean values.
