Active clinical trials for "Constriction, Pathologic"

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.

Patients with a chronic kidney disease who opt for hemodialysis, needs a well-functioning hemodialysis access. The autologous arteriovenous fistula (AVF) is recognized as the golden standard of dialysis access. Unfortunately a great number of the AVFs fail to mature, and therefore cannot be used for dialysis. A significant stenosis is a major cause of nonmaturing AVFs. Remarkable are the stenoses that seem to develop in the venous outflow tract where the vascular clamp was located during surgery. The primary aim of this study was to compare bloodless surgery using vascular clamps and a tourniquet with respect to the development of hemodynamic or anatomical significant stenosis in patients with a brachiocephalic or radiocephalic AVF.

There is both a poor life expectancy and a poor prognosis of limb salvage in those patience with stenoses or occlusions of the lower limb. To date only a small number of these patients could be helped through medication or surgery. The indications for stent placement are poor primary results following percutaneous transluminal angioplasty or evidence of a flow-limiting dissection. The primary success rate after a stent placement is between 80% and 90%. One so far inconsistent discussed problem is the occurrence of in-stent restenosis which is expected in 20% to 78% of treated lesions, depending on the stent used. Using only percutaneous transluminal angioplasty for treatment of an in-stent restenosis, restenosis reoccurs in 70% to 80% of cases. The aim of this study is to analyse the primary success and the long term results of angioplasty using the drug-coated balloon (paclitaxel) compared to an non-coated balloon in the treatment of in-stent restenosis of lower limb arteries.

ATTR-cardiac amyloidosis (CA) is present in 4% to 16% of elderly patients with severe calcific aortic stenosis (AS). The reasons for this association are not fully known. It is hypothesized that an amyloidotic infiltration of the aortic valve acts as a trigger for the development of endothelial damage and subsequent calcification. Elderly patients undergoing TAVI will be evaluated for the presence of ATTR-CA in Jordan.

Patients with back pain with spinal stenosis of the lower back will be asked to volunteer for this research study. These patients don't need immediate surgery for this problem. Treatment of this kind of back pain with spinal stenosis usually includes physical therapy exercises and steroid injections. Both treatments are usually helpful in patients with back pain with spinal stenosis. However, physicians and other healthcare providers don't know which treatment is better to give first. The purpose of this research is to answer that question. Patients enrolled in this study will receive both treatments: physical therapy (PT) and a steroid injection ("shot"). However, patients may get the shot first followed by PT, or they may have PT first, followed by the shot. Their time in this study will last up to 6 months, and there will be five outcome measurements (via visits or telephone). All study visits will take place at the Atlanta VA Medical Center (Atlanta VA). Investigators hope to enroll about 120 subjects from the Atlanta VA. Enrolled patients will be randomized using a randomization computer program.

The investigators hypothesize that the confocal endomicroscopy imaging of the biliary strictures during ERCP will differentiate between benign and malignant strictures in vivo and has increased sensitivity compared to biliary brushing/biopsy, and that direct cholangioscopic guidance of pCLE is more accurate than fluoroscopic guidance.

This study evaluates Mitomycin C as treatment for dysphagia in adult subjects with documented complex esophageal anastomotic strictures. Patients will be randomized in a double-blinded fashion to topical application of normal saline (NS) or Mitomycin C (MMC) at the time of time of index procedure.

The aim of the study to evaluate the outcome of diamond flap versus V-Y flap for treatment of severe post hemorroidectomy anal stenosis .

Pilot study of early versus delayed carotid endarterectomy (CEA) for small to medium-sized ischemic stroke caused by high-grade carotid stenosis.

The central hypothesis of this study is that TAVR leads to platelet deposition and inflammatory cell activation that can be attenuated by the potent anti-platelet and/or pleiotropic effects of ticagrelor. This single center, prospective randomized trial addresses the following specific aims: To determine whether high-potency ADP receptor blockade reduces measures of platelet activation in patients after TAVR. To determine whether high-potency ADP receptor blockade mitigates the pro-thrombotic inflammatory response observed after TAVR.