View clinical trials related to Aortic Aneurysm.
Filter by:This is an observational cohort study addressing the incidence of cerebral microemboli and alterations of cerebral hemodynamic physiology of the Relay®Branch thoracic stent-graft system.
In clinical practice a lot of EVAR cases are performed IFU for adverse neck anatomy(6) with acceptable short- and mid-term outcomes, but the long-term durability is currently an issue (7). Neck length shorter than 15 mm and angulation are two of. neck charteristics. that contribute more to define an "hostile neck" (8). The issue linked to the anatomical not feasibility of standard EVAR in patients not eligible for OR can be solved with custom made devices (CMD), but they were limited by high production costs and long time for creations (10-12 weeks)1. Nowadays no one off-the-shelf device aimed to overcome neck hostility in AAA is available on the market. The present study aims at evaluating the anatomical applicability of an off-the-shelf scalloped stent-graft to treat infrarenal AAA with a short and/or angulated neck.
Rationale: An abdominal aortic aneurysm (AAA) is a common vascular disease with a high mortality in case of rupture. The underlying processes initiating aneurysmal degeneration and driving aneurysmal growth remain poorly understood. Local hemodynamics might play a key role in the pathogenesis of AAA, as it is associated with aneurysmal growth, intraluminal thrombus formation and rupture risk. Visualizing and quantifying local blood flow profiles could eventually provide more insight in the underlying mechanisms of aneurysm progression as well as identify smaller AAA with increased vulnerability or larger AAA with low risk of rupture. Consequently, this may improve risk assessment and provide patient-specific therapy guidance. Nowadays, endovascular aneurysm repair (EVAR) is the preferred treatment modality in most patients with an infrarenal AAA. However, EVAR is associated with a relatively high reintervention rate. It is hypothesized that the placement of a stent graft may alter local hemodynamics and subsequent recirculations or flow stagnations promote the onset of thrombosis or micro-emboli. These unfavourable flow conditions might be related to various complications after EVAR, such as limb occlusion, renal dysfunction, and the persistence of type II endoleaks. Visualizing local blood flow profiles after EVAR might provide insight in these (un)favourable conditions. In vivo blood flow quantification is a great challenge, particularly in the abdomen. Advanced ultrasound based techniques, incorporating ultrasound contrast agents and plane wave imaging, proved to be feasible in quantifying aortoiliac blood flow patterns in healthy volunteers. Objective: The aim of this study is to determine the feasibility of ultrafast contrast-enhanced ultrasound particle image velocimetry (echoPIV) measurements to quantify spatiotemporal blood flow velocity profiles in the abdominal aorta of AAA patients before and after endovascular repair. Secondary objectives are to determine the correlation between echoPIV and phase-contrast MRI (PC MRI) based measurements to ultimately validate the spatiotemporal velocity profiles obtained with echoPIV. Furthermore, changes in blood flow velocity profiles after placement of a stent graft will be evaluated.
This project concerns a population at risk of sudden death by dissection of the thoracic aorta. Its interest is to make it possible to recognize the genes that protect or worsen the evolution of aneurysms, to better understand the mechanisms involved, to detect and treat aneurysms of the thoracic aorta, wich is a pathology that is completely silent clinically until life-threatening complications. The variability in the severity of the disease within the same family is related to modifier genes. The objective is to find the modifying factors that account for the variability in the severity of the progression of aneurysms of the thoracic aorta.
Multicenter, single-arm retrospective and prospective registry is being conducted to confirm the clinical performance and safety of GORE® VIABAHN® VBX Balloon Expandable Endoprosthesis when used as a Bridging Stent with Branched and Fenestrated Endografts in the Treatment of Aortic Aneurysms Involving the Renal-Mesenteric Arteries.
The Diagnosis of a thoracic Aortic Aneruysms usually made when imaging an abdominal aortic aneurysm which has reached threshold or as an incidental finding during a chest scan by computed tomography (CT) or magnetic resonance imaging (MRI). However, these imaging modalities are expensive, involve radiation exposure and can cause anaphylaxis and other allergic reaction from the contract agents used. In addition CT scans are contraindicated for those who have: allergic reactions to the contrast, radioactive iodine treatment for thyroid disease, metformin use, and chronic or acutely worsening renal disease. Ultrasound is a non-invasive imaging modality that is cheaper than the methods currently used for TAA detection and surveillance. Echocardiography is limited in assessing the TAA as it is not sensitive to image beyond the proximal ascending aorta which is why it is currently not used for screening or surveillance. A pilot study found that ultrasound has the potential to be used as a diagnostic modality for thoracic aortic aneurysms and may have a role in surveillance in patients for whom CT scanning is contraindicated. They found that the sensitivity and specificity of detecting TAA was 100% and 70% for a threshold of 35 mm, and 84% and 90% for a threshold of 40 mm. However, further validation of this methodology is required for it to be considered as a method of diagnosis and surveillance for this patient group. This study was only carried out by one experienced sonographer so it important to repeat this study to see if other sonographers are able to obtain the necessary views. The main purpose of this study is to validate the protocol used by pilot study to assess whether thoracic aortic aneurysms can be detected and measured accurately using ultrasound. There are two main objectives of this study: 1. Can ultrasound be used to detect thoracic aortic aneurysms? 2. Can ultrasound be used to accurately measure thoracic aortic aneurysms? If the results of this study show that ultrasound has high sensitivity and specificity for detecting thoracic aortic aneurysms, it could lead to a thoracic aorta screening programme.
This is a first in human study to evaluate the safety and clinical utility of an investigational medical device called the Nectero EAST System to treat Abdominal Aortic Aneurysms or AAA.
This multicenter, single-arm retrospective registry (chart review) is being conducted to confirm the clinical performance and safety of GORE-TEX® Vascular Grafts and GORE® PROPATEN® Vascular Graft throughout the device functional lifetime for each indication area.
Lung surgery, open aortic surgery, TEVAR, and EVAR are major operations that carry a higher incidence of perioperative mortality and complications compare to other surgery. The study of the incidence of mortality and complications will help the hospital to benchmark with the others. Also the study of the risk factors of mortality and major complications will help to improve the patients' outcomes.
The strength of movement which are applied on the EVAR are not only cranio-caudal but also lateral. The movement of the EVAR's body within the aneurysm could be an instability's criteria of the EVAR. The investigators would like to show that this lateral movement is a risk factor of reintervention they should follow and suggest a reinforced medical follow-up to avoid complications.