View clinical trials related to Constriction, Pathologic.
Filter by:The goal of this study is to investigate the genetic and gender specific differences, in patients with low flow low gradient aortic stenosis and high flow high gradient aortic stenosis. Patients referred for surgical aorticvalve replacement will be offered to participarte in the study. The main questions the study aims to answer are: 1. Low-gradient aortic stenosis is associated with differences in valvular concentration of the genes that code for mast-cell chymase, Angiotensin-II, ACE, ACE2 and Angiotensin receptor 1 and 2. 2. Low-gradient aortic stenosis is associated with differences in the genetic code of renin-angiotensin-aldosterone system. 3. Gender differences in LV remodelling associates with different levels of sexual hormones. Patients participating in the study will be asked to undergo: - Cardiac ultrasound, MR- and CT-scan prior to surgery - Blooddraw prior to surgery. - Heartmuscle biopsy during surgery - Cardiac MR-scan 1 year after surgery.
A Clinical Trial of the Transcatheter Aortic Valve Implantation System with a Prospective, Multi-Center, One-Arm Approach to Evaluate the Efficacy and Safety in the Treatment of Patients with Severe Aortic Stenosis
The goal of this trial is to determine whether the use of a novel SGLT2 inhibitor(Sodium-glucose Cotransporter-2), Enavogliflozin is safe and effective for the improvement of adverse clinical outcomes and the reversal of adverse cardiac remodelling among patients who had undergone TAVR as compared with the standard-of-care therapy.
The purpose of this registry is to evaluate the safety and efficacy of RIC for patients with symptomatic intracranial atherosclerotic stenosis (sICAS) undergoing endovascular therapy.
Rheumatic mitral stenosis remains a health problem in developing countries. Progressive fibrosis of the valves and myocardium is the main pathophysiology that plays an important role. Dapagliflozin has various beneficial effects on the heart by reducing fibrosis, reducing inflammation, and improving patient quality of life. However, the role of this therapy is unknown in patients with rheumatic mitral stenosis.
To collect information about the management of symptomatic severe Aortic Stenosis (AS) and Aortic Regurgitation (AR) using transcatheter aortic valve replacement (TAVI).
This is a single-centre, prospective, observational cohort study focusing on of patients suffering severe aortic valve stenosis (AS) undergoing emergent transcatheter aortic valve implantation (TAVI). AS patients undergoing emergent TAVI always have complicated clinical situations. Therefore, the aims of the study are to collect the incidence and outcomes of emergent TAVI in patients with severe symptomatic AS, to assess the safety and effectiveness of emergency TAVI system for severe AS, and to describe a more practical evidence of emergency TAVI system in severe AS patients.
Pyelo-ureteral junction syndrome is the most common urological abnormality in children. Functional MRI has been evaluated several times, and had shown good correlation with scintigraphy, but tends to over estimate results. Moreover, those studies included a small number of cases. Its sensitivity to detect crossing polar vessel is limited. We aimed to evaluate, in patients between 0 and 1 year old, the correlation between MRI and scintigraphy differential renal function. Our secondary objectives are : evaluation of MRI performances to detect polar vessel ; comparison of surgery times depending of MRI only realisation or MRI and scintigraphy realisation.
Ischaemic Heart Disease (IHD) is the worlds leading cause of death. IHD is often caused by a narrowing of the coronary arteries, which prevents blood from flowing to the heart muscle, causing pain and damage to the heart. If an individual has a myocardial infarction (MI), parts of the heart that are damaged cannot be repaired. Therefore, it is important to identify and treat the narrowing of the arteries before an MI occurs. At present there are 2 main methods of identifying narrowing of the arteries. The first is an invasive procedure, the other using a CT scan. Whilst both methods are effective, they entail risk. The invasive procedure can damage the coronary arteries, whilst the CT scan exposes patients to radiation and contrast, which can increase the risk of cancer and allergic reactions. Magnetic Resonance (MR) scanning is an alternative to these methods, but it has been limited in use in the past due, in part, to the high technical knowledge required to obtain images. In addition, there is a degree of subjectivity in the selection of the mid-diastolic rest period, potentially affecting consistency of results. This means it is difficult to use in a day-to-day hospital environment. However, recent technological developments using artificial intelligence mean that images can be acquired in a more automated and consistent fashion. This new scan has yet to be tested in a clinical trial. Therefore, the objective of the clinical study is to test this new scan to determine its efficacy. 230 patients at 5 sites at risk of coronary artery disease, who have been referred for invasive coronary angiography, will undergo both their angiography and the new MR scan. The MR scan will then be compared to CCTA for diagnostic accuracy and image quality. The investigators hypothesise that the new MR scan will have the same diagnostic accuracy as invasive coronary angiography, with no differences in interpretation of the images across the 5 different hospitals. If proven effective, this would demonstrate that MR scanning of the coronary arteries could prove a safe, clinically useful alternative to both CT scanning and invasive assessment of coronary artery narrowing. In addition, if there is no difference across different locations, it would demonstrate that these scans can be performed consistently, facilitating implementation on a healthcare-system wide basis.
The optimal screening methods for coronary insufficiency, a frequent and pejorative complication in diabetics, are subject to debate, particularly in situations of silent myocardial ischemia. The contemporary strategy consists of pre-selecting asymptomatic patients at very high cardiovascular (CV) risk by performing a coronary calcium score. If this is found to be high >300 AU (Agatston units), the patient is suspected of being at high risk of silent myocardial ischemia (SMI), and the assessment is completed to exclude the presence of coronary artery disease likely to benefit from revascularization. The complementary evaluation consists in evaluating the myocardial perfusion to judge the perfusion repercussions. The most common examination to date is myocardial scintigraphy, because stress tests are too frequently submaximal in diabetics. However, the reproducibility of scintigraphy is controversial and their sensitivity and specificity are debated in this indication. This problem is similar in stable symptomatic coronary diabetic patients for whom an indication for functional examinations is justified. The double-energy double-layer spectral scanner (SDEDC) could now become a relevant tool in this field, since it can combine not only anatomical data (identification of coronary stenosis) but also functional data (myocardial perfusion) during a stress protocol. thanks to the spectral images which make it possible to measure the tissue concentration of intramyocardial iodine downstream of the considered stenosis.