View clinical trials related to Constriction, Pathologic.
Filter by:The goal of this prospective clinical study is improve the diagnosis of Low-flow low-gradient aortic stenosis (LF/LG AS), in patients with co-existing wild-type transthyretin cardiac amyloidosis (ATTRwt). The main question it aims to answer is whether the classic dobutamine-stress echocardiography can be used to determine AS severity in patients with ATTRwt and LF/LG AS This question will be tried to answer by comparing dobutamine stress echocardiography, with the invasively measured aortic valve area (which is considered as the gold standard). In addition we aim to assess the degree of myocardial fibrosis and amyloid infiltration, assessed by light microscopy and cardiac magnetic resonance (CMRI) and evaluation of myocyte mitochondrial function by high resolution respirometry and their relation to AS severity and hemodynamic response to dobutamine.
Mitral stenosis, a condition characterized by narrowing of the mitral valve orifice, remains a significant cause of morbidity and mortality worldwide, particularly in regions where rheumatic fever is endemic. Despite advancements in medical and surgical management, patients with mitral stenosis often suffer from symptoms such as dyspnea, fatigue, and reduced exercise tolerance, significantly impacting their quality of life (QoL) [1]. One of the hallmark features of mitral stenosis is the development of sinus rhythm, which can be associated with elevated heart rates due to decreased diastolic filling time and compensatory mechanisms to maintain cardiac output. Persistent tachycardia in patients with mitral stenosis contributes to increased myocardial oxygen demand, exacerbating symptoms and potentially leading to adverse outcomes [2]. In recent years, ivabradine, a selective inhibitor of the If current in the sinoatrial node, has emerged as a promising therapeutic option for controlling heart rate in various cardiovascular conditions, including chronic heart failure and ischemic heart disease [3]. By specifically targeting the cardiac pacemaker cells, ivabradine reduces heart rate without affecting myocardial contractility or conduction, offering a unique mechanism of heart rate control compared to traditional beta-blockers or calcium channel blockers [4]. However, the role of ivabradine in patients with mitral stenosis in sinus rhythm remains uncertain, and there is limited evidence regarding its efficacy and impact on QoL in this specific patient population. Therefore, the aim of this randomized controlled trial (RCT) is to investigate the effects of ivabradine on heart rate control and QoL in patients with mitral stenosis in sinus rhythm.
This study aims to evaluate the usefulness of disposable digital single-operator cholangioscopy (SOC) and intraductal ultrasound (IDUS) for the accurate diagnosis of indeterminate biliary stricture.
The purpose of this trial is to evaluate effectiveness and safety of the Ton-bridge carotid stent for the treatment of carotid artery stenosis.
A prospective study aimed to compare the efficacy and safety of Unilateral biportal endoscopic (UBE) technique and uniportal endoscopic (UE) technique for treating patients with lumbar spinal stenosis (LSS).
Establishment of a clinical urethral stricture database for a prospective longitudinal cohort study.
The purpose of this research study is to determine how well an FDA-approved drug, dupilumab, works to treat patients with severe strictures and active Eosinophilic Esophagitis (EoE). This is an open-label study, meaning everyone in the study will receive dupilumab. Participants will have a screening visit where they will complete surveys and undergo an endoscopy (EGD). Blood and biopsies (small tissue samples) will also be collected. If eligible and enrolled into the study, participants will receive weekly subcutaneous (under the skin) injections of dupilumab for 52 weeks (one year). The first dose of dupilumab will be administered at the week 1 visit by a clinician and participants will receive training on how to self-administer the remaining doses. Participants will return for study visits every at weeks 4, 8, 12, 18, 24, 30, 36, 44, and 52. During these visits, vital signs (temperature, heart rate, etc.) will be collected and participants will complete surveys. During visits at week 12, 24, and 52, blood will be collected and an endoscopy with biopsy will be performed. At 64 weeks (12 weeks after the last dose of dupilumab), participants assigned male at birth (AMAB) will be contacted about their / their partner's pregnancy status and participants assigned female at birth (AFAB) may be asked to come for an in-person visit to complete a urine pregnancy test.
• Evaluation of the effect of PTMC on LAA function by TEE at least one month after the procedure and its effectiveness in prevention of thrombi formation and cerebrovascular complications.
The project aims to shed light on the role of Sirtuins, enzymes belonging to the third class of histone deacetylases (class III) involved in epigenetic modifications (deacetylation), focusing mainly on Sirtuin 6 (SIRT6), as a regulator of atherosclerosis and severe aortic valve stenosis through molecular-based and epigenetic studies in human VSMC cells.
The purpose of this study is to explore the mechanism of cognitive impairment in patients with symptomatic intracranial atherosclerotic stenosis (ICAS), and further plans to explore the impact of different treatment options on cognitive function in symptomatic ICAS patients.