Ombretta Martinelli. UOC di Chirurgia Vascolare Policlinico Umberto I Università degli Studi di Roma Sapienza

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1 Ombretta Martinelli UOC di Chirurgia Vascolare Policlinico Umberto I Università degli Studi di Roma Sapienza

2 Ombretta Martinelli has no financial arrangement or other relationship that could be constructed as conflict of interest

3 Contemporary research suggests that, unlike open abdominal aortic aneurysm repair, EVAR requires vigilant post-implantation monitoring to rescue device failure

4 Cochrane Database of Systematic Reviews of EVAR Trials -2014

5 Endoleaks have been referred to as the Achilles heel of EVAR and is found in 20-40% during follow-up

6 Contrast-enhanced CT is still the current imaging standard after EVAR Anyhow, contrast-induced nephropathy, cumulative radiation exposure and cost are great concerns in lifelong CT surveillance

7 This has led to several cohort analyzes to evaluate the diagnostic reliability of ultrasounds (DUS and CEUS) for the post-evar surveillance

8 Assuming CTA to be a gold standard, sensitivity, specificity of 2D CEUS to detect endoleaks were 100% and 92%, respectively

9 Our experience 48 cases CTA gold standard CEUS (SonoVue) Endoleak (yes) Endoleak (no) CTA Type 2 Endoleak (yes) CTA Type 2 Endoleak (no) Sensitivity 96% Specificity 92%

10 All endoleaks directed for re-intervention by CTA were also detected by CEUS. Endoleaks detected by CTA but missed by CEUS either resolved or were insignificant in provoking sac expansion EVAR surveillance protocols can be carried out safely with CEUS

11 CT arterial phase Due to the dynamic nature, CT venous phase with a delay of 240 s it is likely that those endoleaks detected by CEUS are true leaks missed by CTA having a static nature

12 Our experience 23 treated endoleaks DSA gold standard Imaging modality True positives False positives False negatives True negatives Sensitivity Specificity DUS % 66.6% CEUS % 100% CTA % 100%

13 Compared with CTA or MRA, CEUS appears to have equal specificity and superior sensitivity to identify endoleaks

14 CT angiography cannot appreciate blood flow direction, limiting its specificity for classification of the endoleaks

15 Due to its real-time dynamic nature, CEUS provides a better classification of endoleaks than CTA It also allows to get data to forsee their outcome and to identify those ELs causing sac growth

16 CEUS can evaluate delay of endoleak detection (wash-in) disappearance (wash-out) from the beginning of contrast injection

17 the hyperdynamic endoleaks show a fast wash-in and wash-out due to the presence of inflow and outflow vessels These endoleaks may thrombose spontaneously, without increasing the aneurysm sac

18 The absence of an outflow artery (slow wash-out) identify the hypodynamic endoleaks These slow-flow endoleaks are not able to create a way out from the sac, thus causing aneurysm pressurization and progressive enlargement, independently from endoleak volume and extension They can be missed by CTA

19 CEUS can evaluate those parameters predicting aneurysm sac enlargement Bidirectional spectral Doppler waveform Cavity filling (spreading of the contrast medium within the thrombus, without concentration in a nidus of the sac) These EL characteristics suggest more frequent EVAR surveillance and are at high risk of reintervention

20

21 The 3D-CEUS achieves multiplanar reconstructions ensuring that adjacent vessels are not mistaken for endoleaks It allows confident identification and classification of even small leaks and more accurate measurements of sac diameters

22 Conclusive remarks CEUS is relatively cheap, quick to perform, and has infrequent risks to the patient CEUS seems to be at least equal or even superior to CTA and can be a first-line diagnostic tool to detect and classify endoleaks The specific value of CEUS is the detection of those endoleaks at higher risk of adverse outcomes with more certainty than CTA

23 Conclusive remarks CEUS shares limitations of all ultrasound studies: operator dependency and patient s habitus and even for highly experienced sonographers, the suprarenal area remains challenging Multiphasic CT should be used when ultrasound modalities are not diagnostics due to an unfavorable anatomy and for reintervention plannning

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