Active clinical trials for "Constriction, Pathologic"

Microvascular function in patients undergoing Transcatheter Aortic Valve Implant (TAVI) for severe symptomatic aortic stenosis: association with myocardial fibrosis

The aim of this study was to investigate the validity and reliability of the 2 Minute Step Test (2MST) in patients with symptomatic degenerative lumbar spinal stenosis and to explore its correlation with objective assessment methods, namely the 2 Minute Walk Test (2MWT) and the 6 Minute Walk Test (6MWT).

This is a Phase I clinical study to determine the safety and efficacy of using autologous, engineered urethral constructs for the treatment of urethral strictures in adult males. The proposed study design is a prospective non-randomized and uncontrolled single-center investigation. Autologous urothelial cells (UCs) and smooth muscle cells (SMCs), obtained from enrolled male subjects' bladder tissue samples, will be culture expanded in vitro and used to seed tubular PGA scaffolds to create autologous urethral constructs for the repair of urethral strictures.

The role of cardiac mechanics, circulating biomarkers and frailty in predicting outcomes in patients with aortic stenosis after aortic valve replacement (SCRABLES -The 2-Parts Study) Part I: Observational study to characterize phenotypes, structural alterations and biomarkers profiles in a broad spectrum of patients with aortic stenosis and heart failure with preserved ejection fraction (HFpEF). Part II: Prospective cohort study to characterize patients' phenotypes, cardiac structural alterations, circulating biomarkers and frailty in order to optimize risk stratification and patient selection for aortic valve intervention.

To assess the efficacy of duodenal prostheses for duodenal stenosis established for endoscopic pyloric or duodenal stenosis on dysphagia

Investigators plan to characterize systemic inflammation and circulating immune cells in participants with moderate and severe calcific aortic valve disease and matched healthy controls.

Conventional open surgery has been shown to be an effective procedure for LCS decompression. Minimally invasive surgery (MIS) through tubular retractors is a recently introduced alternative procedure for decompression of LCS. The current study aims at evaluating the efficacy of minimally invasive surgery as a decompressive procedure in comparison to conventional open surgery for the treatment of patients with LCS.

The purpose of this study is to evaluate the efficacy and safety of pelacarsen (TQJ230) administered subcutaneously once monthly compared to placebo in slowing the progression of calcific aortic valve stenosis.

Although concomitant coronary artery disease (CAD) is frequent in patients with severe aortic stenosis (AS), hemodynamic assessment of CAD severity in patients undergoing valve replacement for severe AS is challenging. Myocardial hypertrophic remodeling interferes with coronary blood flow and may influence the values of fractional flow reserve (FFR) and nonhyperemic pressure ratios (NHPRs). The aim of the current study is to investigate the effect of the AS and its treatment on current indices used for evaluation of CAD. The investigators will compare intracoronary hemodynamics before, immediately after, and 6 mo after aortic valve replacement (AVR) when it is expected that microvascular function has improved. Furthermore, the investigators will compare FFR and resting full-cycle ratio (RFR) with myocardial perfusion single-photon emission-computed tomography (SPECT) as indicators of myocardial ischemia in patients with AS and CAD. One-hundred consecutive patients with AS and intermediate CAD will be prospectively included. Patients will undergo pre-AVR SPECT and intracoronary hemodynamic assessment at baseline, immediately after valve replacement [if transcatheter AVR (TAVR) is chosen], and 6 mo after AVR. The primary end point is the change in FFR 6 mo after AVR. Secondary end points include the acute change of FFR after TAVR, the diagnostic accuracy of FFR versus RFR compared with SPECT for the assessment of ischemia, changes in microvascular function as assessed by the index of microcirculatory resistance (IMR), and the effect of these changes on FFR. The present study will evaluate intracoronary hemodynamic parameters before, immediately after, and 6 mo after AVR in patients with AS and intermediate coronary stenosis. The understanding of the impact of AVR on the assessment of FFR, NHPR, and microvascular function may help guide the need for revascularization in patients with AS and CAD planned for AVR.

Prospective, randomised, open-label, international multicenter trial to evaluate the safety and efficacy of drug-coated balloon (DCB) treatment compared to drug-eluting stenting (DES) in patients with large coronary artery disease.