NCT04503395 · FCRE (Foundation for Cardiovascular Research and Education)
ShOrt neCK AAA RAndomized Trial - ESAR and FEVAR: SOCRATES
(SOCRATES)
What this study is about
The aim of this randomly assigned study is to compare the safety and performance of EndoVascular Aneurysm Repair with ESAR using Endurant + Heli-FX™ EndoAnchor™ system and FEVAR using customizable grafts from Cook (Zenith Fenestrated Graft) and Terumo (Fenestrated Anaconda Graft) for the treatment of aortic aneurysms with short aortic neck (4 to 15mm).
View original scientific description
The aim of this randomized study is to compare the safety and performance of EndoVascular Aneurysm Repair with ESAR using Endurant + Heli-FX™ EndoAnchor™ system and FEVAR using customizable grafts from Cook (Zenith Fenestrated Graft) and Terumo (Fenestrated Anaconda Graft) for the treatment of aortic aneurysms with short aortic neck (4 to 15mm).
Who can participate
This study lists these criteria on ClinicalTrials.gov. A study coordinator reviews eligibility during screening — this page does not determine whether you qualify.
Inclusion criteria
- Subject is \>18 years old
- Subject is scheduled for primary treatment of the abdominal aortic aneurysm with a non-aneurysmal infrarenal aortic sealing zone proximal to the aneurysm that is sufficiently healthy for a proximal neck length that is at least 4mm and not more than15 mm and has a circumferential minimum sealing zone length of 8 mm
- Subject is not a candidate for safe, effective and durable standard EVAR due to challenging anatomical criteria as confirmed by the Core Lab screening
- Subject is able and willing to comply with the protocol and to adhere to the follow-up requirements.
- Subject has provided written informed consent CT Angiographic Inclusion Criteria
- Subject meets the other anatomical requirements according to the locally applicable Endurant II/IIs stent graft system, Heli-FX EndoAnchor system, Terumo Fenestrated Anaconda (available in EU only) and/or Cook Zenith Fenestrated Graft Instructions for Use
- Proximal neck length of the aorta within 4-15mm and a minimum circumferential sealing zone of 8mm
- Aortic neck diameter from 19 to 31mm
- Infrarenal neck angulation ≤45°
Exclusion criteria
- Subject is participating in a concurrent study which may confound study results
- Subject has a life expectancy \<2 year
- Subject is female of childbearing potential in whom pregnancy cannot be excluded
- Subject with eGFR \<30 mL/min/m2 (KDOQI classification - exclude class IV and above) and or on dialysis
- Subject with a MI or CVA within 3 months prior to index procedure
- Subject with known Connective Tissue Disease
- Subject has a known hypersensitivity or contraindication to anticoagulants, antiplatelets, or contrast media, which is not amenable to post-treatment
- Subject who has undergone prior endovascular or open surgical treatment for abdominal aortic aneurysm
- Subject requires emergent aneurysm treatment, for example, trauma or rupture
- Subject has a known hypersensitivity or allergies to study device implant material
- Subject has an aneurysm that is:
- Suprarenal, pararenal, or thoracoabdominal
- Inflammatory
- Pseudoaneurysm
- Subject is presenting with thrombus or calcification of the proximal aneurysm neck: circumferential \>50%
- Pre-op stenosis of the renal arteries \> 50%
- Subject has active infection or history of COVID-19. History of COVID-19 is defined as availability of positive COVID-19 test with sequelae or hospitalization for treatment of COVID-19.
Where
- La Jolla, California
- Stanford, California
- Gainesville, Florida
- Grand Rapids, Michigan
- New York, New York
- Tulsa, Oklahoma
- Portland, Oregon
- Pittsburgh, Pennsylvania
- Norfolk, Virginia
Frequently asked questions
What is a clinical trial?
A clinical trial is a research study that tests new medical treatments, drugs, devices, or procedures to determine their safety and effectiveness. Trials are carefully designed and monitored to protect participants while advancing medical knowledge.
Is it safe to participate?
Clinical trials follow strict safety guidelines and ethical standards. Trials must be reviewed and approved, and participants are closely monitored by medical professionals throughout the study. You can withdraw at any time if you choose.
Will I be compensated?
Many clinical trials offer compensation for your time, travel expenses, and inconvenience. The specific compensation varies by study and will be discussed during the screening process. All study-related medical care is typically provided at no cost to participants.
Will I receive a placebo instead of treatment?
When effective treatment exists, participants typically receive either the standard treatment plus the study intervention, or the standard treatment plus placebo. You would not be denied effective care. Placebos are primarily used when no proven treatment is available, or in addition to standard care. Your trial consent form will clearly explain what treatments you may receive.
Can I leave a trial if I change my mind?
Absolutely. Participation in clinical trials is completely voluntary. You have the right to withdraw from the study at any time, for any reason, without penalty or loss of benefits to which you are otherwise entitled.
How long does a clinical trial last?
Trial duration varies widely depending on the study design and purpose. Some trials last just a few weeks, while others may continue for months or years. The study coordinator will provide specific timeline information during your screening call.
Data: ClinicalTrials.gov · synced May 22, 2026 · Source of record for eligibility and locations