EndoleakNCT02016131
CQDSA in Evaluation of Prognosis After EVAR
An observational study of Endoleak and Aortic Aneurysm, Abdominal, run by Shanghai Zhongshan Hospital at 1 site in China.
Trial summary
Re-hospitalization or re-intervention is sometimes necessary to treat type I and type III endoleaks after EVAR for its persistent increasing of pressure in aneurysm lumen. Color-coded quantitative digital subtraction angiography (CQDSA) provides an easy and quick way to post-process the traditional digital subtraction… Read more about this study
- Who is it for?
- Ages 18 to 90 years
- Conditions the study is for
- Endoleak, Aortic Aneurysm, Abdominal
- How many people
- 49 participants
- Where
- 1 siteChina
- Study dates
- Jan 2012to Mar 2015
- Phase
- Observational
- Are there results?
- None posted in the registry
Key requirements
Who can take part, as listed by the sponsor. Only the study team can confirm whether you are eligible, so take this list to your doctor.
- Ages 18 to 90 years
- All sexes
- No healthy volunteers
- Adult, Older adult
Study population: Patients who present type I endoleak after EVAR for AAA.
Who may be able to join
- Patients who present type I or/and type III endoleak after EVAR for AAA and complete at least 3 months' follow up.
Who cannot join
- Patients who
- undergo surgeries which involve the segment covered by EVAR;
- present connective tissue disease, such as Marfan's Syndrome or vasculitis.
- present abdominal aortic dissection.
- present AAA rupture.
- die from non aneurysm-reltated reasons or are lost during follow up.
Trial locations and contacts
1 site in 1 country.
About this study
Official title: Application of Color-coded Quantitative Digital Subtraction Angiography in Evaluation of Prognosis After Endovascular Repairment of Abdominal Aortic Aneurysm
Re-hospitalization or re-intervention is sometimes necessary to treat type I and type III endoleaks after EVAR for its persistent increasing of pressure in aneurysm lumen. Color-coded quantitative digital subtraction angiography (CQDSA) provides an easy and quick way to post-process the traditional digital subtraction angiography (DSA) which converts the peak time of the maximal contrast medium intensity into a single polychromatic image. With the help of CQDSA, a quantitative evaluation of the endoleak hemodynamics and a risk analysis of the type I or type III endoleak could be performed during the EVAR procedure. This approach may offer an objective assessment of the needs for immediate re-intervention, conservative therapy or treatment endpoint in the future.
Read the detailed description
Intra-procedural DSA series are transferred to a research workstation to generate the color-coded images and make quantitative measurements. Region of interest (ROI) measurements are performed equivalently in the endoleak and the aorta after the image generation. There are three kinds of ROIs including a small circle area with the shortest time to peak, a circle area with peak contrast intensity and the whole endoleak area. The ROI and a reference at the same latitude within the aorta are selected to undergo measurement which reflected the endoleak hemodynamics of the endoleak to the utmost extent.
The following parameters will be acquired through the CQDSA for analysis.
- Time-versus-ROI contrast intensity graph. The graph contains one endoleak ROI flow curve and one reference aortic flow curve (Ref). The x-axis shows time from 0 second to the maximum frame time of the image. The y-axis shows the sum of pixel intensities, namely total contrast, representing the contrast concentration within the ROI.
- ROI Peak/Ref Peak. It is the ratio of intensity peak between the endoleak and the reference in the aorta.
- ROI TTP (Time to peak). Peak time of ROI in the vicinity of endoleak entry.
- ROI AUC/Ref AUC. Area under curve (AUC) is calculated through Time-versus-ROI contrast intensity graph. The parameter here is the ratio of ROI AUC in endoleak to the reference.
- Conditions
- Endoleak, Aortic Aneurysm, Abdominal
- Keywords
- endoleak, EVAR, AAA, CQDSA
- Medical subject headings
- Endoleak, Aortic Aneurysm, Abdominal
What participants receive
What participants receive. In a randomised study each person is assigned to one group by chance.
| Study group | Role | What they receive |
|---|---|---|
| none endoleak events | Patients who have no further endoleaks related adverse events including aneurysm enlargement and rupture or persistent endoleaks. | |
| Endoleak events | Patients who undergo endoleaks related adverse events or persistent endoleaks during follow up. |
What is being measured
The primary outcome is the main question the study is designed to answer.
Time-versus-ROI contrast intensity graph.
The graph contains one endoleak ROI flow curve and one reference aortic flow curve (Ref). The x-axis shows time from 0 second to the maximum frame time of the image. The y-axis shows the sum of pixel intensities, namely total contrast, representing the contrast concentration within the ROI.
Measured: 15 seconds
ROI Peak/Ref Peak
It is the ratio of intensity peak between the endoleak and the reference in the aorta.
Measured: 15 seconds
ROI TTP (Time to peak)
Peak time of ROI in the vicinity of endoleak entry
Measured: 15 seconds
ROI AUC/Ref AUC
Area under curve (AUC) is calculated through Time-versus-ROI contrast intensity graph. The parameter here is the ratio of ROI AUC in endoleak to the reference.
Measured: 15 seconds
Timeline
From the start of the study to its completion; the mark is today. Estimated dates are the sponsor’s plan.
- First posted19 Dec 2013 (estimated)
- Study startJan 2012
- Primary completionSep 2014
- Study completionMar 2015
Resources
- Official record on ClinicalTrials.govThe registry entry this page is built from, with its full change history.
- Publications (19)Papers the sponsor has linked to this study.
- Other trials for EndoleakStudies of the same condition, open and under way.
- More trials run by Shanghai Zhongshan HospitalThe sponsor's other registered studies.
- What the trial phases meanHow a treatment moves from first tests in people to approval.
More details
For doctors and researchers: how the study is designed, who runs it, and its registry IDs.
Study design
- Study type
- Observational
- Observational model
- Case-control
- Time perspective
- Prospective
- Enrolment
- 49 participants (actual)
Sponsor and investigators
- Lead sponsor
- Shanghai Zhongshan Hospital
- Sponsor type
- University, hospital or other
- Collaborators
- Siemens Ltd., China, Shanghai, China.
- Responsible party
- Principal investigator, Zhenyu Shi, Shanghai Zhongshan Hospital
- Investigators
- Weiguo Fu, MD, Study chair, Shanghai Zhongshan Hospital
IDs, dates and publications
- ClinicalTrials.gov ID
- NCT02016131
- Sponsor's protocol ID
- CQDSA_EVAR
- Status last verified
- May 2015
- First submitted
- 14 Dec 2013
- Last updated
- 21 Aug 2025
- Results posted
- No
- Data monitoring committee
- No
Publications
Lederle FA, Johnson GR, Wilson SE, Chute EP, Littooy FN, Bandyk D, Krupski WC, Barone GW, Acher CW, Ballard DJ. Prevalence and associations of abdominal aortic aneurysm detected through screening. Aneurysm Detection and Management (ADAM) Veterans Affairs Cooperative Study Group. Ann Intern Med. 1997 Mar 15;126(6):441-9. doi: 10.7326/0003-4819-126-6-199703150-00004.
PubMed 9072929Thompson AR, Cooper JA, Ashton HA, Hafez H. Growth rates of small abdominal aortic aneurysms correlate with clinical events. Br J Surg. 2010 Jan;97(1):37-44. doi: 10.1002/bjs.6779.
PubMed 20013940Brady AR, Thompson SG, Fowkes FG, Greenhalgh RM, Powell JT; UK Small Aneurysm Trial Participants. Abdominal aortic aneurysm expansion: risk factors and time intervals for surveillance. Circulation. 2004 Jul 6;110(1):16-21. doi: 10.1161/01.CIR.0000133279.07468.9F. Epub 2004 Jun 21.
PubMed 15210603Reed WW, Hallett JW Jr, Damiano MA, Ballard DJ. Learning from the last ultrasound. A population-based study of patients with abdominal aortic aneurysm. Arch Intern Med. 1997 Oct 13;157(18):2064-8. doi: 10.1001/archinte.157.18.2064.
PubMed 9382661Scott RA, Ashton HA, Lamparelli MJ, Harris GJ, Stevens JW. A 14-year experience with 6 cm as a criterion for surgical treatment of abdominal aortic aneurysm. Br J Surg. 1999 Oct;86(10):1317-21. doi: 10.1046/j.1365-2168.1999.01227.x.
PubMed 10540141Scott RA, Wilson NM, Ashton HA, Kay DN. Is surgery necessary for abdominal aortic aneurysm less than 6 cm in diameter? Lancet. 1993 Dec 4;342(8884):1395-6. doi: 10.1016/0140-6736(93)92756-j.
PubMed 7901685Mortality results for randomised controlled trial of early elective surgery or ultrasonographic surveillance for small abdominal aortic aneurysms. The UK Small Aneurysm Trial Participants. Lancet. 1998 Nov 21;352(9141):1649-55.
PubMed 9853436Lederle FA, Wilson SE, Johnson GR, Reinke DB, Littooy FN, Acher CW, Ballard DJ, Messina LM, Gordon IL, Chute EP, Krupski WC, Busuttil SJ, Barone GW, Sparks S, Graham LM, Rapp JH, Makaroun MS, Moneta GL, Cambria RA, Makhoul RG, Eton D, Ansel HJ, Freischlag JA, Bandyk D; Aneurysm Detection and Management Veterans Affairs Cooperative Study Group. Immediate repair compared with surveillance of small abdominal aortic aneurysms. N Engl J Med. 2002 May 9;346(19):1437-44. doi: 10.1056/NEJMoa012573.
PubMed 12000813Moll FL, Powell JT, Fraedrich G, Verzini F, Haulon S, Waltham M, van Herwaarden JA, Holt PJ, van Keulen JW, Rantner B, Schlosser FJ, Setacci F, Ricco JB; European Society for Vascular Surgery. Management of abdominal aortic aneurysms clinical practice guidelines of the European society for vascular surgery. Eur J Vasc Endovasc Surg. 2011 Jan;41 Suppl 1:S1-S58. doi: 10.1016/j.ejvs.2010.09.011. No abstract available.
PubMed 21215940Jens S, Marquering HA, Koelemay MJ, Reekers JA. Perfusion angiography of the foot in patients with critical limb ischemia: description of the technique. Cardiovasc Intervent Radiol. 2015 Feb;38(1):201-5. doi: 10.1007/s00270-014-1036-5. Epub 2014 Dec 13.
PubMed 25501266Benndorf G. Color-coded digital subtraction angiography: the end of a monochromatic era? AJNR Am J Neuroradiol. 2010 May;31(5):925-7. doi: 10.3174/ajnr.A2077. Epub 2010 Apr 15. No abstract available.
PubMed 20395396Mehndiratta A, Knopp MV, Zechmann CM, Owsijewitsch M, von Tengg-Kobligk H, Zamecnik P, Kauczor HU, Choyke PL, Giesel FL. Comparison of diagnostic quality and accuracy in color-coded versus gray-scale DCE-MR imaging display. Int J Comput Assist Radiol Surg. 2009 Sep;4(5):457-62. doi: 10.1007/s11548-009-0356-4. Epub 2009 Jun 4.
PubMed 20033528Tenjin H, Asakura F, Nakahara Y, Matsumoto K, Matsuo T, Urano F, Ueda S. Evaluation of intraaneurysmal blood velocity by time-density curve analysis and digital subtraction angiography. AJNR Am J Neuroradiol. 1998 Aug;19(7):1303-7.
PubMed 9726473Strother CM, Bender F, Deuerling-Zheng Y, Royalty K, Pulfer KA, Baumgart J, Zellerhoff M, Aagaard-Kienitz B, Niemann DB, Lindstrom ML. Parametric color coding of digital subtraction angiography. AJNR Am J Neuroradiol. 2010 May;31(5):919-24. doi: 10.3174/ajnr.A2020. Epub 2010 Feb 18.
PubMed 20167651Khanafer KM, Bull JL, Upchurch GR Jr, Berguer R. Turbulence significantly increases pressure and fluid shear stress in an aortic aneurysm model under resting and exercise flow conditions. Ann Vasc Surg. 2007 Jan;21(1):67-74. doi: 10.1016/j.avsg.2006.10.009.
PubMed 17349339
Study at a glance
From the registry record, last updated by the sponsor on 21 Aug 2025. Recruitment status is as the sponsor reported it: confirm with the study team.
- Official title
- Application of Color-coded Quantitative Digital Subtraction Angiography in Evaluation of Prognosis After Endovascular Repairment of Abdominal Aortic Aneurysm
- ClinicalTrials.gov ID
- NCT02016131
- Acronym / sponsor ID
- CQDSA_EVAR
- Conditions
- Endoleak, Aortic Aneurysm, Abdominal
- Keywords
- endoleak, EVAR, AAA, CQDSA
- Study type
- Observational
- Recruitment status
- Completed
- Enrolment
- 49 participants (actual)
- Lead sponsor
- Shanghai Zhongshan HospitalUniversity, hospital or other
- Collaborators
- Siemens Ltd., China, Shanghai, China.
- Study start
- Jan 2012
- Primary completion
- Sep 2014 (actual)
- Study completion
- Mar 2015 (actual)
- First posted
- 19 Dec 2013 (estimated)
- Results
- Not posted in the source record
Clinical summary
The research question as the sponsor registered it. This describes what the study plans to test, not what it found.
Re-hospitalization or re-intervention is sometimes necessary to treat type I and type III endoleaks after EVAR for its persistent increasing of pressure in aneurysm lumen. Color-coded quantitative digital subtraction angiography (CQDSA) provides an easy and quick way to post-process the traditional digital subtraction angiography (DSA) which converts the peak time of the maximal contrast medium intensity into a single polychromatic image. With the help of CQDSA, a quantitative evaluation of the endoleak hemodynamics and a risk analysis of the type I or type III endoleak could be performed during the EVAR procedure. This approach may offer an objective assessment of the needs for immediate re-intervention, conservative therapy or treatment endpoint in the future.
Detailed description
Intra-procedural DSA series are transferred to a research workstation to generate the color-coded images and make quantitative measurements. Region of interest (ROI) measurements are performed equivalently in the endoleak and the aorta after the image generation. There are three kinds of ROIs including a small circle area with the shortest time to peak, a circle area with peak contrast intensity and the whole endoleak area. The ROI and a reference at the same latitude within the aorta are selected to undergo measurement which reflected the endoleak hemodynamics of the endoleak to the utmost extent.
The following parameters will be acquired through the CQDSA for analysis.
- Time-versus-ROI contrast intensity graph. The graph contains one endoleak ROI flow curve and one reference aortic flow curve (Ref). The x-axis shows time from 0 second to the maximum frame time of the image. The y-axis shows the sum of pixel intensities, namely total contrast, representing the contrast concentration within the ROI.
- ROI Peak/Ref Peak. It is the ratio of intensity peak between the endoleak and the reference in the aorta.
- ROI TTP (Time to peak). Peak time of ROI in the vicinity of endoleak entry.
- ROI AUC/Ref AUC. Area under curve (AUC) is calculated through Time-versus-ROI contrast intensity graph. The parameter here is the ratio of ROI AUC in endoleak to the reference.
Study design
- Observational model
- Case-control
- Time perspective
- Prospective
- Number of arms
- 2
| Arm | Type | Receives |
|---|---|---|
| none endoleak events | – | –Patients who have no further endoleaks related adverse events including aneurysm enlargement and rupture or persistent endoleaks. |
| Endoleak events | – | –Patients who undergo endoleaks related adverse events or persistent endoleaks during follow up. |
Who may qualify
- Ages
- 18 to 90 years
- Sex
- All
- Healthy volunteers
- Not accepted
- Age groups
- Adult, Older adult
- Study population
- Patients who present type I endoleak after EVAR for AAA.
Key inclusion criteria (1 listed)
- Patients who present type I or/and type III endoleak after EVAR for AAA and complete at least 3 months' follow up.
Key exclusion criteria (6 listed)
- Patients who
Eligibility is decided by the study team after screening; this overview does not establish that a patient qualifies. Full inclusion and exclusion criteria.
Primary outcome
Time-versus-ROI contrast intensity graph.
Time frame: 15 seconds
The graph contains one endoleak ROI flow curve and one reference aortic flow curve (Ref). The x-axis shows time from 0 second to the maximum frame time of the image. The y-axis shows the sum of pixel intensities, namely total contrast, representing the contrast concentration within the ROI.
ROI Peak/Ref Peak
Time frame: 15 seconds
It is the ratio of intensity peak between the endoleak and the reference in the aorta.
ROI TTP (Time to peak)
Time frame: 15 seconds
Peak time of ROI in the vicinity of endoleak entry
ROI AUC/Ref AUC
Time frame: 15 seconds
Area under curve (AUC) is calculated through Time-versus-ROI contrast intensity graph. The parameter here is the ratio of ROI AUC in endoleak to the reference.
Results and safety
The study is completed, but results are not available in the source record. That does not mean the treatment did or did not work.
Research links
- Official record on ClinicalTrials.govLast updated by the sponsor 21 Aug 2025.
- Background: PubMed 9072929Lederle FA, Johnson GR, Wilson SE, Chute EP, Littooy FN, Bandyk D, Krupski WC, Barone GW, Acher CW, Ballard DJ. Prevalence and associations of abdominal aortic aneurysm detected through screening. Aneurysm Detection and Management (ADAM) Veterans Affairs Cooperative Study Group. Ann Intern Med. 1997 Mar 15;126(6):441-9. doi: 10.7326/0003-4819-126-6-199703150-00004.
- Background: PubMed 20013940Thompson AR, Cooper JA, Ashton HA, Hafez H. Growth rates of small abdominal aortic aneurysms correlate with clinical events. Br J Surg. 2010 Jan;97(1):37-44. doi: 10.1002/bjs.6779.
- Background: PubMed 15210603Brady AR, Thompson SG, Fowkes FG, Greenhalgh RM, Powell JT; UK Small Aneurysm Trial Participants. Abdominal aortic aneurysm expansion: risk factors and time intervals for surveillance. Circulation. 2004 Jul 6;110(1):16-21. doi: 10.1161/01.CIR.0000133279.07468.9F. Epub 2004 Jun 21.
- Background: PubMed 9382661Reed WW, Hallett JW Jr, Damiano MA, Ballard DJ. Learning from the last ultrasound. A population-based study of patients with abdominal aortic aneurysm. Arch Intern Med. 1997 Oct 13;157(18):2064-8. doi: 10.1001/archinte.157.18.2064.
- Background: PubMed 10540141Scott RA, Ashton HA, Lamparelli MJ, Harris GJ, Stevens JW. A 14-year experience with 6 cm as a criterion for surgical treatment of abdominal aortic aneurysm. Br J Surg. 1999 Oct;86(10):1317-21. doi: 10.1046/j.1365-2168.1999.01227.x.
- Background: PubMed 7901685Scott RA, Wilson NM, Ashton HA, Kay DN. Is surgery necessary for abdominal aortic aneurysm less than 6 cm in diameter? Lancet. 1993 Dec 4;342(8884):1395-6. doi: 10.1016/0140-6736(93)92756-j.
- Background: PubMed 9853436Mortality results for randomised controlled trial of early elective surgery or ultrasonographic surveillance for small abdominal aortic aneurysms. The UK Small Aneurysm Trial Participants. Lancet. 1998 Nov 21;352(9141):1649-55.
- Background: PubMed 12000813Lederle FA, Wilson SE, Johnson GR, Reinke DB, Littooy FN, Acher CW, Ballard DJ, Messina LM, Gordon IL, Chute EP, Krupski WC, Busuttil SJ, Barone GW, Sparks S, Graham LM, Rapp JH, Makaroun MS, Moneta GL, Cambria RA, Makhoul RG, Eton D, Ansel HJ, Freischlag JA, Bandyk D; Aneurysm Detection and Management Veterans Affairs Cooperative Study Group. Immediate repair compared with surveillance of small abdominal aortic aneurysms. N Engl J Med. 2002 May 9;346(19):1437-44. doi: 10.1056/NEJMoa012573.
- Background: PubMed 21215940Moll FL, Powell JT, Fraedrich G, Verzini F, Haulon S, Waltham M, van Herwaarden JA, Holt PJ, van Keulen JW, Rantner B, Schlosser FJ, Setacci F, Ricco JB; European Society for Vascular Surgery. Management of abdominal aortic aneurysms clinical practice guidelines of the European society for vascular surgery. Eur J Vasc Endovasc Surg. 2011 Jan;41 Suppl 1:S1-S58. doi: 10.1016/j.ejvs.2010.09.011. No abstract available.
- Background: PubMed 25501266Jens S, Marquering HA, Koelemay MJ, Reekers JA. Perfusion angiography of the foot in patients with critical limb ischemia: description of the technique. Cardiovasc Intervent Radiol. 2015 Feb;38(1):201-5. doi: 10.1007/s00270-014-1036-5. Epub 2014 Dec 13.
- Background: PubMed 20395396Benndorf G. Color-coded digital subtraction angiography: the end of a monochromatic era? AJNR Am J Neuroradiol. 2010 May;31(5):925-7. doi: 10.3174/ajnr.A2077. Epub 2010 Apr 15. No abstract available.
- Background: PubMed 20033528Mehndiratta A, Knopp MV, Zechmann CM, Owsijewitsch M, von Tengg-Kobligk H, Zamecnik P, Kauczor HU, Choyke PL, Giesel FL. Comparison of diagnostic quality and accuracy in color-coded versus gray-scale DCE-MR imaging display. Int J Comput Assist Radiol Surg. 2009 Sep;4(5):457-62. doi: 10.1007/s11548-009-0356-4. Epub 2009 Jun 4.
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Referral and contact
AzTrials does not enrol participants or take referrals. Contact the study team or a site listed below; they decide who can take part. This study is not recruiting at the moment.
Weiguo Fu, MD study chair
Shanghai Zhongshan Hospital
1 site in 1 country: see every site and its status.
Questions about this trial
What is this clinical trial studying?
An observational study of Endoleak and Aortic Aneurysm, Abdominal, run by Shanghai Zhongshan Hospital at 1 site in China.
The full registered description is in the About this study section and the official record.
Who may be eligible to take part?
The sponsor lists 1 inclusion and 6 exclusion criteria. Eligibility is decided by the study team after screening, so read the full criteria and contact a listed site.
Is this clinical trial currently recruiting?
The record says: finished, as of the sponsor's last update on 21 Aug 2025. Status can change between updates, so confirm with the study contact before making plans.
Where is the study taking place?
The record lists 1 site in China. Whether a site is taking part right now should be confirmed with that site. See every site.
What are the possible benefits and risks?
They depend on the study and the treatment, and no study can promise a benefit. The study team explains the known risks during informed consent, before anyone joins; the record itself does not list them.
Are results available for this study?
The study is completed, but results are not available in the source record. That does not mean the treatment did or did not work.
How can a doctor refer a patient or contact the research team?
The record lists no contact. The official record names the sponsor, who can be asked directly. AzTrials does not enrol participants or take referrals.
What does the primary outcome measure?
Time-versus-ROI contrast intensity graph. (time frame: 15 seconds). The study lists 4 primary outcomes in all. It is what the study was designed to measure, not a finding.
Where can I read the original study information?
On the ClinicalTrials.gov record for NCT02016131, which also lists 19 linked publications.
Does a listing mean the treatment is approved or proven to work?
No. A listing means the study is registered. It does not show that the treatment is safe, works, or is approved by a regulator.
How often is this information updated?
AzTrials copies changed records from ClinicalTrials.gov every night and reloads the whole registry every week. The sponsor last updated this record on 21 Aug 2025.