View clinical trials related to Aortic Stenosis.
Filter by:The association study will compare the allele frequencies of polymorphisms of a single nucleotide (SNP) in the population of individuals with aortic stenosis compared to a control population. Patients will be included only if they are suffering from a typical form of tight and surgical tricuspid aortic stenosis. Patients will therefore only included if they are suffering from aortic stenosis, the surface is less than 1 cm² and if histological analysis or failing intraoperative findings of the surgeon showed a tricuspid aortic stenosis.
Surgical aortic valve replacement (SVAR) is currently the 'Gold Standard' therapy for patients with severe symptomatic aortic stenosis (AS). Approximately 30-50% of patients with severe AS are deemed inoperable due to comorbidities such as severe respiratory disease, chronic renal disease and peripheral vascular disease. Transcatheter aortic valve replacement (TAVR) has emerged as a novel therapeutic modality for inoperable patients and an effective alternative to SAVR in selected high and intermediate-risk patients. Myocardial ischemia and reperfusion injury (MRI), mediated by reactive oxygen species (ROS), related to cardiopulmonary bypass has been linked to adverse clinical outcomes following cardiac surgery. In contrast to SAVR, transcatheter deployment of aortic prostheses requires shorter time of ischemia and hypotension and may be associated with less ROS mediated MRI. Inflammatory responses and reperfusion injury following TAVR have not been previously described nor compared to SAVR. The aim of this study is therefore to compare the oxidative stress response in patients with isolated severe symptomatic AS undergoing SAVR or TAVR and determine whether it correlates with clinical outcomes.
The goal of this study is to describe the increase in plasma serotonin or 5-hydroxytryptamine (5-HT) in patient with increased severity of aortic stenosis and increased weight cardiac muscle.
This study proposes to perform a descriptive analysis and pilot observational study looking at the types and quantity of anesthetic agents used and their associations with outcomes among patients scheduled to receive transfemoral aortic valve replacements (TAVR) at Yale New Haven Hospital (YNHH).
Prior to the deployment of transcatheter heart valves (THV), balloon aortic valvuloplasty (BAV) is often performed under rapid right ventricular pacing (burst >180 bpm) with the induction of a functional cardiac arrest for up to 30 seconds. Aortic valve predilation aims at facilitating the crossing of the aortic annulus, accurate valve positioning and does also provide information on the anatomy of the valve complex. However, BAV has been shown to have a number of potentially detrimental effects. There is limited experience for the balloon expandable Edwards THV on the need for predilation (BAV). Experience so far has only been documented from smaller, uncontrolled case series. The investigators aim to document the incidence of several kinds of complications in a large, multicenter registry / prospective controlled cohort study to identify associations between patient related variables and outcomes.
BACKGROUND.- The frailty syndrome (FS) associates an increase in morbidity and mortality in the elderly patient. When severe and symptomatic, aortic stenosis (AS) is a disease with poor prognosis, the most frequent cause of heart surgery in the elderly and associates high health costs. No variables have been identified as determinants of morbidity and mortality of these patients and there are not algorithms developed for treatment decision-making in this particular population. The FS as a functional reserve indicator could be a prognostic and interventional treatment tolerance marker, and should be included in the selection of patients for surgical treatment. The FS and cardiovascular disease (CVD) share biological substrates among which an inflammatory state associates poor prognosis. OBJECTIVES .- To evaluate the effectiveness of the diagnosis of FS to characterize the prognosis of elderly patients with severe symptomatic AS representative of clinical practice. In addition, to examine the contribution of an inflammatory state to the relationship of FS with the prognosis of severe, symptomatic AS. METHODS .- Prospective study during 12 months of 200 patients > 74 years old with severe symptomatic AS. During the index visit the main clinical characteristics will be recorded and in addition we will perform a comprehensive geriatric assessment, FS assessmet according to Fried et al criteria (strength, walking speed, physical activity, fatigue, unintentional weight loss) and determination of inflammatory markers (C-reactive protein and interleukin-6). During follow-up, measures of functional impairment (basic and instrumental activities of daily living, walking speed and timed set up & go test), hospitalizations, death and quality of life will be determined.
This is an international, mutli-center, prospective, consecutively enrolled, observational registry. 2000 patients are planned to be enrolled over one year at up to 150 participating sites. 300 patients out of the 2000 patients enrolled in the main registry are planned to be consecutively enrolled in a select few sites for studying the valve performance. Echocardiogram and angiogram will be taken routinely.
The study purpose is to compare the EDWARDS INTUITY valve system with commercially available stented aortic bioprostheses, in patients requiring aortic valve replacement surgery with coronary artery bypass.
Following completion of enrollment in the PARTNER II SAPIEN 3 intermediate risk trial, this trial provided continued access to treatment for subjects with severe aortic stenosis who were at intermediate surgical risk.
The purpose of this study is to evaluate the safety and effectiveness of the 17mm MDT-2215 aortic valve bioprosthesis.