Active clinical trials for "Constriction, Pathologic"

The purpose of this study is to compare the duration of stent patency of a covered vs. an uncovered biliary self-expandable metal stents (SEMS) placed to relieve biliary obstruction in patients with inoperable extrahepatic malignant biliary obstruction.

Stenosis of symptomatic lumbar canal is presented as a series of degenerative changes affecting the various vertebral segment structures, including: a joint zigoapofisária, yellow ligament, the articular capsule and the intervertebral disk. These changes decrease the area of the spinal canal and press the neural structures and may present clinically as the narrow tunnel syndrome. This presentation was first described by Verbiest associated with these anatomical changes the clinical manifestations; corresponding to low back pain, pain in the legs that worsen with the fact ambulate and improve with rest, this presentation called neurogenic claudication . The lumbar canal stenosis was divided into two main types; congenital and acquired . The first is associated with a reduced size of the pedicles, which leads to a reduction of the diameter of the spinal canal, common in patients achondroplasics . The acquired is considered the most common type and is associated with aging, including all anatomical structures of the lumbar segment . With an aging population the number of symptomatic patients is increasing, although there is no statistic defined stenosis of symptomatic lumbar canal is the main reason for surgical approaches to the spine in patients over 60 years of age (7). As described by Daffner et al a reduction in blood flow leads to production of inflammatory mediators, which associated with anatomical changes previously described lead to the clinical picture with lameness and pain in the lower limbs Treatment of these patients is beginning with guidance on the disease, adequate pain control, physical therapy and exercise for maintaining the activities of daily living. If these measures fail a surgical approach may be necessary, especially in patients with exercise intolerance, difficulty walking and urinary incontinence . The surgical approach despite being widely studied in the literature prospective controlled studies are rare, found series of case studies or retrospective studies, we try to evaluate the effectiveness of surgery compared to rehabilitation in symptomatic patients in an attempt to assess the impact of surgery associated with comparing therapy with isolated therapy in these patients.

Percutaneous Extraforaminotomy using BS extraforamonotomy kit(BioSpine Co.,Ltd, Seoul, South Korea), was performed in patients who did not show improvement lasting more than 1 month after diagnostic conventional fluoroscopically guided transforaminal epidural block with local anesthetic and steroid. Numeric rating scale(NRS) pain score, Oswestry disability index (ODI), Roland-Morris Disability Questionnaire (RDQ), claudication distance(CD) was checked before and after the procedure.

The objective of this project is to determine whether biodegradable polydioxanone stents are efficient in the treatment of adult patients with tracheobronchial stenoses.

This study investigates safety and efficacy of surgical treatment of patients with anterior urethral stricture using a tissue-engineered construct based on autologous buccal mucosa cells and matrix from reconstituted collagen and reinforcing polylactoglycolide fibers. This is a single arm study with no control. Success will be assessed via objective and subjective methods; complications will be tallied in a standardized fashion. Outcomes will be measured at five years.

A non-randomized prospective clinical, pilot study in a single centre assessing the safety and feasibility of the esophageal biodegradable covered stent for refractory benign esophageal strictures with or without fistulae

Evaluation of drug eluting peripheral vascular stent system for the treatment of superficial femoral artery stenosis and / or occlusion, there is better in effectiveness and clinical performance compared with similar products already on the market.

The purpose of this study is to investigate the use of a functional luminal imaging probe to characterize benign esophageal luminal strictures before and after dilation and identify predictors of response to therapy. Patients will be evaluated during endoscopy using functional luminal imaging (EndoFLIP; Crospon Medical Devices, Galway, Ireland) to characterize the geometry of benign luminal esophageal narrowing before and after dilation.

This study will be a multicentre randomized controlled trial to assess the efficacy between balloon dilatation and self-expanding metallic stent placement for endoscopic treatment of stenosis in Crohn´s Disease.

The management of patients who have ingested a caustic product has changed since 2007. Whereas previously the lesion assessment and surgical indication were based on endoscopic data, the therapeutic algorithm is currently based solely on the results of a CT scan with contrast injection, performed 6 hours after ingestion. This examination makes it possible to reliably assess the viability of the esophageal and gastric walls and thus to indicate digestive resection. The therapeutic consequences of this new treatment are important because, by expanding the indications for conservative treatment after severe ingestion, it brings a significant gain in terms of survival, morbidity and functional outcome. In the absence of emergency digestive resection, however, the functional prognosis is often overshadowed by the formation of esophageal stenosis in the months following ingestion. Patients then require endoscopic dilation treatment. In the event of failure or impossibility of dilation, which defines refractory stenosis, esophageal reconstruction is necessary. In case of sequential pharyngeal stenosis following ingestion, esophageal and pharyngeal reconstruction is indicated as a first-line treatment, since these stenosis do not respond to endoscopic dilations. The expansion of the indications for conservative treatment after severe ingestion using CT scans has led to an increase in the incidence of after-effect stenosis. We aim to develop a therapeutic approach that will prevent the development of refractory and pharyngeal esophageal stenosis. Indeed, there is currently no strategy that has proven effective in this regard in adults. The value of corticosteroid therapy for the prevention of caustic stenosis has only been evaluated in children and remains controversial. The main objective is to evaluate the effect of early systemic corticosteroid therapy on the risk of refractory esophageal or pharyngeal stenosis within one year of ingestion of a caustic substance in a population of patients at high risk of stenosis, defined according to tomodensitometric criteria (grade IIb: severe lesions, absence of transparietal necrosis), and for whom there is no indication of urgent digestive resection.