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Aortic Stenosis clinical trials

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NCT ID: NCT03600051 Completed - Aortic Stenosis Clinical Trials

Automated Phonocardiography Analysis in Adults

Start date: December 10, 2015
Study type: Observational

Background: Computer aided auscultation in the differentiation of pathologic (AHA class I) from no- or innocent murmurs (AHA class III) via artificial intelligence algorithms could be a useful tool to assist healthcare providers in identifying pathological heart murmurs and may avoid unnecessary referrals to medical specialists. Objective: Assess the quality of the artificial intelligence (AI) algorithm that autonomously detects and classifies heart murmurs as either pathologic (AHA class I) or as no- or innocent (AHA class III). Hypothesis: The algorithm used in this study is able to analyze and identify pathologic heart murmurs (AHA class I) in an adult population with valve defects with a similar sensitivity compared to medical specialist. Methods: Each patient is auscultated and diagnosed independently by a medical specialist by means of standard auscultation. Auscultation findings are verified via gold-standard echocardiogram diagnosis. For each patient, a phonocardiogram (PCG) - a digital recording of the heart sounds - is acquired. The recordings are later analyzed using the AI algorithm. The algorithm results are compared to the findings of the medical professionals as well as to the echocardiogram findings.

NCT ID: NCT03557242 Not yet recruiting - Aortic Stenosis Clinical Trials

Strategies to Prevent Transcatheter Heart Valve Dysfunction in Low Risk Transcatheter Aortic Valve Replacement

Start date: June 30, 2018
Phase: N/A
Study type: Interventional

100 subjects in the each of the treatment arms of the study (total 200 treatment arm subjects) and up to 100 subjects in the registry arm of the study.

NCT ID: NCT03466918 Not yet recruiting - Aortic Stenosis Clinical Trials

Safety and Effectiveness of Edwards Lifesciences SAPIEN 3 Transcatheter Heart Valve (THV) in the Chinese Population

Start date: March 2018
Phase: N/A
Study type: Interventional

To evaluate the safety and effectiveness of the SAPIEN 3 (Edwards Lifesciences, Irvine, California) transcatheter heart valve implantation (TAVI) in Chinese patients with symptomatic severe calcific aortic stenosis who are considered at high risk for surgical valve replacement.

NCT ID: NCT03454360 Recruiting - Aortic Stenosis Clinical Trials

CHANGE Neo™ TA Registry With ACURATE Neo™ Aortic Bioprosthesis and ACURATE Neo™ TA Transapical Delivery System

Start date: February 6, 2018
Study type: Observational

The purpose of this registry is to collect specific health and patient data to identify more precisely the patient population undergoing TA aortic valve replacement with the ACURATE neo™ Aortic biprosthesis and ACURATE neo™ TA Transapical Delivery System. Safety and efficacy data will be collected to support the commercial use of the ACURATE neo™ Aortic Bioprosthesis and ACURATE neo™ TA Transapical Delivery System in a specific TA population. As per IFU, the ACURATE neo™ and its ACURATE neo™ TA Delivery System are intended for use in minimally invasive, transcatheter aortic valve replacement using transapical access in patients presenting with severe aortic valve stenosis.

NCT ID: NCT03442400 Recruiting - Aortic Stenosis Clinical Trials

A Prospective Study of Fractional Flow Reserve Assessment of Intermediate Coronary Stenoses in Severe Aortic Stenosis

Start date: February 14, 2018
Phase: N/A
Study type: Interventional

Coronary artery blockages can reduce blood flow to the heart muscle. Fractional flow reserve (iFR or FFR) assessment is an invasive tool used to determine how much blood flow is reduced. The investigators will perform iFR/FFR on all intermediate coronary stenoses using standard practice, immediately before (at the time of) transcatheter aortic valve replacement (TAVR) and after successful TAVR. The investigators will compare pre- and post-TAVR iFR/FFR values, and assess short-term outcomes. The investigators hypothesize that iFR/FFR values will be consistently and significantly higher pre-TAVR in comparison with post-TAVR for the same lesions.

NCT ID: NCT03432494 Enrolling by invitation - Aortic Stenosis Clinical Trials

Transmural Systems Transcaval Closure Device for Transcaval Access Ports During Transcatheter Aortic Valve Replacement

Start date: August 22, 2018
Phase: N/A
Study type: Interventional

Background: TAVR is a common therapy for people with heart problems as a better option than surgery. It stands for transcatheter aortic valve replacement. It is usually done by inserting a catheter (thin tube) through a groin artery. But this isn t safe for everyone. Researchers developed a new technique called transcaval access. The catheter is placed in the artery deep in the body by crossing through the wall of a deep vein. The connection between that vein and the aorta is closed with a new metallic device they are testing. This is called a transcaval closure device (TCD). Objective: To test the safety and early feasibility of closure of transcaval aortic access sites using the TCD after TAVR. Eligibility: Adults ages 21 and older undergoing TAVR for whom the procedure cannot be performed safely by the standard artery approach Design: Participants will be assessed by heart experts including cardiologists and surgeons. Participants will have TAVR by the transcaval approach. A small catheter will be passed between the largest vein in the body and the nearby largest artery (aorta), inside the abdomen. Through this catheter, the TAVR will be implanted in the usual way. After, doctors will implant the TCD by catheter to close the hole made in the aorta. Participants will be X-rayed. A dye will be injected to view the TCD device. Participants will get standard TAVR care afterwards. They will have physical exams, blood tests, and scans. Participants will have a follow-up scan within 1 month and after 12 months. Participants will have follow-up visits and phone calls 6 and 12 months after the procedure.

NCT ID: NCT03424941 Recruiting - Aortic Stenosis Clinical Trials

The TransCatheter Valve and Vessels Trial

Start date: May 31, 2018
Phase: N/A
Study type: Interventional

The trial objective is to investigate whether Fractional Flow Reserve (FFR)-Guided Percutaneous Coronary Intervention (PCI) and TransCatheter Aortic Valve Implantation (TAVI) strategy for treatment of multivessel disease and aortic stenosis will be non-inferior to Coronary Artery By-pass Grafting (CABG) and Surgical Aortic Valve Replacement (SAVR) for a composite primary endpoint of all-cause mortality, stroke, myocardial infarction, coronary or valve re-intervention and life-threatening or disabling bleeding at one year.

NCT ID: NCT03423459 Recruiting - Aortic Stenosis Clinical Trials

CoreValve Evolut Pro Registry

Start date: January 18, 2018
Phase: N/A
Study type: Observational [Patient Registry]

The primary objective of this study is to evaluate the real-world performance of the CoreValve Evolut PRO transcatheter aortic valve, including leaflet function, in a prospective observational registry.

NCT ID: NCT03383445 Recruiting - Aortic Stenosis Clinical Trials

Transcatheter Aortic Valve Replacement Versu Surgical Aortix Valve Replacement for Treating Elderly Patients With Severe Aortic Stenosis and Small Aortic Annuli: A Prospective Randomized Study The VIVA Trial

Start date: May 30, 2017
Phase: N/A
Study type: Interventional

To date, no formal, randomized, prospective, head-to-head comparisons of surgical aortic valve replacement (SAVR) versus transcatheter aortic valve replacement (TAVR) have been undertaken in the severe aortic stenosis (AS) population with small aortic annuli. Objectives of the present study are to compare the hemodynamic performance (incidence of severe PPM and ≥ moderate AR) and clinical outcomes (death, stroke, major or life threatening bleeding) between TAVR and SAVR in patients with severe AS and small aortic annuli.

NCT ID: NCT03352089 Recruiting - Aortic Stenosis Clinical Trials

Positron Emission Tomography / Magnetic Resonance Imaging in Aortic Stenosis

Start date: November 1, 2017
Phase: N/A
Study type: Observational

Aortic stenosis is the most common valve disease requiring surgery in the Western world. It is defined by progressive calcification and fibrosis of the valve leaflets and restricted valve opening. This in turn exposes the heart muscle (left ventricle) to increasing pressure leading to heart muscle thickening (left ventricular hypertrophy, LVH) to normalise wall stress and maintain heart output (stroke volume). The only treatment available is relief of pressure overload by surgical or minimally invasive valve replacement (TAVI). Transthyretin (TTR) amyloidosis is a condition characterised by deposition of insoluble transthyretin protein (a small protein tetramer produced in the liver) in various tissues, predominantly in the heart. Although there are inherited forms caused by specific TTR gene mutations, most cases occur in older individuals with non-mutated TTR (wild-type). The finding of TTR plaques in elderly individuals is relatively common; in a post-mortem study 22-25% of patients over the age of 80 had evidence of cardiac amyloid deposition. However, there is significant progressive amyloid accumulation in a small percentage of individuals leading to heart muscle thickening and heart failure. No medical treatments are currently licensed although several agents are at advanced stages of clinical trials. As both the above conditions are increasingly common in the elderly population and characterised by increased heart muscle thickening, there is the potential for them to coexist unrecognised in individual patients. The prevalence of cardiac amyloidosis in clinical populations with significant aortic stenosis is not known however small series have estimated somewhere in the region of 6-29%. Other data have suggested that patients with aortic stenosis and concurrent cardiac amyloidosis have an adverse prognosis even despite AVR. It is therefore important to identify aortic stenosis patients with coexistent amyloidosis both in terms of predicting prognosis and because it may influence decisions about whether to proceed to valve intervention. PET/MR is an emerging technique, which combines the excellent temporal and spatial resolution of MRI with the sensitive molecular imaging of PET. PET/MR has significant advantages over PET/CT (the currently more widely used approach) in that it offers superior tissue characterisation, improved correction for cardiac and respiratory motion and major reductions in radiation exposure. Whilst there are concerns about its ability to provide reliable attenuation correction of the PET data, these issues appear to have been largely overcome with recent techniques proposed by our group. MR is also more naturally suited to the imaging of certain tissues in the body compared to CT including the left ventricular myocardium. In aortic stenosis, MRI has become the gold-standard technique for examining the heart muscle (myocardium) with the unique ability to assess its tissue composition. In particular both late gadolinium enhancement (LGE) and T1 mapping based techniques are able to detect heart scarring (fibrosis) which act as biomarkers of left ventricular decompensation and are strongly associated with poor patient outcomes. CMR is also the gold-standard non-invasive technique for detecting cardiac amyloid, which is associated with both a characteristic pattern of LGE and high native T1 values. However it is not currently able to differentiate between the two different types of cardiac amyloid TTR and AL amyloidosis, which have different prognoses and treatments. Preliminary studies conducted by our group have suggested that 18F-NaF PET when added to CMR can make this distinction on the basis that this tracer binds to TTR deposits but not AL deposits, may be able to differentiate between the two. Importantly we have also used the same PET tracer as a marker of calcification activity in the aortic valve, demonstrating its ability to predict disease progression and cardiac events. In this study, we will investigate whether PET/MR could be used as "one-stop" imaging in aortic stenosis in whom valve intervention is being considered to assess in detail functional and structural properties of both the valve and myocardium and identify cases of significant cardiac TTR amyloid deposition.