Active clinical trials for "Constriction, Pathologic"

In a prospective study the investigators perform repeated cholangioscopies in all patients that received percutaneous transhepatic biliary drainage (PTBD) for a variety of malignant and benign diseases. Endoscopic findings and their correlation with clinical features will be recorded prospectively. The impact on clinical decision will be evaluated.

The study aimed to assess role of DIA in diagnosing nature of indeterminate bile ducts stricture

Evaluation of the FLEX Vessel Prep system combined with angioplasty in the treatment of arteriovenous access stenosis.

The aim of this project is to develop a questionnaire that should distinguish patients with lumbar spinal stenosis (LSS) from other patients. LSS can cause significant pain and disability leading to dramatically reduced quality of life, immobility and functional limitation. The number of people with pain and disability due to LSS is expected to increase with age due to the degenerative nature of the disease. With an aging population this could potentially become a major health economic challenge. One of the challenges to estimate the true prevalence is the lack of a valid and reliable gold standard for LSS. To our knowledge, no diagnostic screening tool designed to estimate the prevalence of LSS in a clinical population of Danish patients with chronic low back pain (LBP) and leg pain has been developed. The objective of this project is to develop a diagnostic screening tool for LSS - the LLS Screen. This should consist of a set of items useable in a self-administered questionnaire, a rule to compute the probability of having LSS, and a cutpoint to be used to obtain a sensitivity of 95%. The rule should be applicable in patient populations suffering from low back pain and with increased suspicion to suffer from LSS due to failure of non-surgical treatment

The intermediate coronary stenoses defined by a degree of stenosis from 40 to 70 % are frequent. The Flow Fraction Reserve (FFR), realized during coronarography, is an hemodynamic evaluation by the functional impact measuring the loss of load in upstream / approval of the stenosis inthe basal state and in situation of hyperemia led by adenosine. Further to the study FAME, the threshold of definition of the significant character of one Stenosis was fixed for a value of FFR = 0,80. However, the impact forecasts intermediate values badly known rest. We hypothetized that coronary stenosis associated with borderline values of FFR 0.81-0.85 were associated with a higher rate of clinical events than those with a FFR >0.85

The interest of renal angioplasty in the nosological framework of atherosclerotic stenosis has been significantly challenged by STAR and ASTRAL clinical trials in 2009, confirmed by the CORAL study in 2014. These studies did not show any benefit of the gesture on renal function, morbidity and cardiovascular mortality or the tension control. The aim of the study is to evaluate renal angioplasty on atherosclerotic stenosis.

A well-functioning vascular access is essential for providing adequate life-sustaining treatment in patients with end stage renal disease on maintenance hemodialysis. The preferred long-term vascular access is the arteriovenous fistula (AVF), which is created using the vessels of the patient by surgically connecting an artery with a superficial vein to increase the blood flow (Qa) in the venous system, which will dilate allowing the insertion of two needles, one to carry the blood to the dialyzer, and the other to return the cleansed blood to the body with the aid of a dialysis machine. Unfortunately, the high prevalence of vascular disease of the hemodialysis patients make difficult to create an adequate AVF in as many as 20 to 60% of the patients.In these persons, a valid alternative is the arteriovenous graft: in graft method an artery is surgically connected to a vein with a short piece of synthetic soft tube which is implanted under the skin. Needles are inserted in the graft during the dialysis treatment. Compared to an AV, however, graft is at higher risk of complications. The most frequent complication is thrombosis (i.e. the formation of blood clot inside the graft). Usually, thrombosis is the consequence of an underlying significant stenosis (i.e. a greater than 50% narrowing of the vessel or graft lumen by comparison with the lumen of a normal adjacent vessel or graft) and its hemodynamic consequences of decreasing the access blood flow (Qa) and/or increasing pressure within the graft. Therefore, all vascular access guidelines recommend regular noninvasive screening programs of grafts for timely identification of a stenosis associated with some type of functional or hemodynamic impairment, because its repair may prevent thrombosis and lengthen the useful life of the access. Screening methods include clinical monitoring and surveillance, which uses special equipment either to assess the hemodynamic consequences of stenosis by measuring Qa and static venous intra-access pressure ratio (VAPR) or to visualize the stenosis by means of duplex ultrasound (DU). Guidelines also state that there is insufficient evidence to prefer one method to another due to the lack of adequate comparative studies. The purpose of our study is to identify an optimal screening program for stenosis detection and elective repair by comparing the diagnostic performance for stenosis and incipient thrombosis of all the available screening tools in the same graft population

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.

In this study, the investigators aimed to determine whether the preoperative Monocyte/HDL ratio would be a predictor of postoperative mortality and morbidity in patients who underwent aortic valve replacement due to aortic stenosis.

Management of a "difficult airway" remains one of the most relevant and challenging tasks for anesthesiologists and pulmonary physicians. Tracheal stenosis is not common but serious complication of prolonged intubation and tracheostomy patients. The incidence of stenosis is very low if intubation lasts less than a week and patients may be asymptomatic for a long time. On presentation, tracheal stenosis may be mistaken for asthma with dyspnea and stridor. The choice of treatment depends on the site, grade, and length of stenosis, as well as on patient comorbidities, history of previous interventions, and the expertise of the surgical team. In this case report the investigators wanted to present a case of a 25-year-old female with post-intubation tracheal stenosis who was intubated for the management of severe preeclampsia.