Active clinical trials for "Arteriovenous Fistula"

40000 patients are hemodialysis each year in France . In the case of chronic care, 78% of patients have an arteriovenous fistula. In order to perform the hemodialysis session, 2 techniques of puncture of the fistula are possible: Bevel puncture upwards then flipping the needle or puncture bevel down. At present, there is no consensus or study on the technique of puncture fistula which generates different professional practices.

The purpose of this study is to determine if Effective Extracorporeal Blood Flow(eEBF) has correlation with Access Blood Flow (Qa), when eEBF adjusts with Dynamic Arterial Line Pressure (DALP) in patients with Arteriovenous fistulae in hemodialysis treatment.

Introduction Arteriovenous fistula (AVF) is the preferred hemodialysis vascular access due to its higher patency and lower infection rate. However, its major weakness is suboptimal maturation rate. Although that substantial risk factors for AVF maturation failure have been disclosed, a modifiable risk factor remains absent. While contemporary theory for AVF maturation failure focuses on disturbed wall shear stress, complicate assumtions and measurement preclude its clinical applicability. In the process of AVF maturation, elevated luminal pressure is required for outward remodeling, however, exccessively high luminal pressure may also be ditremental to AVF maturation, which remains to be defined. This study hypothesize that higher AVF luminal pressure is harmful to its maturation and investigate its potential as a modifiable factor to improve AVF maturation. Methods and analysis This prospective study includes patients receiving surgical creation of native AVF. The exclusion criteria include age <20 years, inability to sign inform consent and failure to create native AVF deu to technical difficulty. Demographic and labboratory profile will be collected before AVF surgery. Vascular sonography will be performed within 1 week of AVF creation to measure the blood flow rates and diameters of AVF and its branched veins. The pressure gredient within AVF will be estimated from blood flow rates by Modified Bernoulli Equation. The primary outcome was spontaneous AVF maturation defined as provision of sufficient blood flow for hemodialysis within 2 months of its creation without any interventional procedures. The secondary outcome is assisted AVF mature, which is defined as AVF maturation within 2 months from its creation, which is aided by any interventional procedure before successful use of AVF. Ethics and dissemination This study has been approved by the ethics committee and Institutional Review Board of Taipei Medical University. Strengths and limitations The strength of the present study is the prospective design that allows complete collection of parameters and outcomes. The predictor of interest for AVF maturation is luminal pressure of AVF. The study assesses hemodynamic parameters of AVF and its branched veins, including diameters, flow rates, and flow volume. The luminal pressure of AVF will be estimated using Modified Bernoulli Equation. The primary outcome of the study is spontaneous AVF maturation.

The most common problem with haemodialysis arteriovenous fistulas (AVF) and arterio-venous grafts (AVG) is stenosis, which can lead to inadequate dialysis, and eventual access thrombosis. Conventional plain old balloon angioplasty is associate with high recurrence rates of stenosis and repeated interventions. The advent of successful drug-eluting technology in the treatment of the coronary vascular bed and subsequent positive accumulating evidence in the peripheral arterial circulation has prompted the use of drug coated balloons (DCB) in the access fistula circuit for venous stenosis and in-stent restenosis. Recent studies suggest that DCBs may significantly reduce re-intervention rates on native and recurrent lesions. The restenosis process is in part or in whole the result of neo-intimal hyperplasia (NIH) and NIH is considered the main culprit in access circuit target lesion stenosis. NIH is the blood vessel's healing response to the barotrauma from the angioplasty process. A critical component of NIH is the cellular proliferative stage with mononuclear leucocytes identified as the primary inflammatory cell type involved. The rationale for drug elution is to block the NIH response with an anti-metabolite such as paclitaxel. It is important to emphasize that the role of drug elution in the treatment of vascular stenosis is not to obtain a good haemodynamic and luminal result but to preserve a good result obtained during POBA from later restenosis due to NIH and minimise reinterventions and readmissions to hospital for what is a frail population of patients. A meta-analysis performed by Khawaja et al. seemed to suggest that DCBs conferred some benefit in terms of improving target lesion primary patency (TLPP) in AVFs. An updated meta-analysis performed by our own institution recently showed that DCB appears to be a better and safe alternative to conventional balloon angioplasty (CBA) in treating patients with HD stenosis based on 6- and 12-months primary patency and increased intervention free period. The Passeo-18 Lux (Biotronik Asia Pacific Pte Ltd (Singapore)) drug-coated balloon (DCB) is packaged with a low dose of paclitaxel. Recent studies have shown that low dose coating of paclitaxel with this DCB is useful for preventing restenosis, decrease lumen loss and target lesion revascularization in the peripheral vasculature6 but has not been tested in the dialysis access circuit.

The aim of the project is to assess the effect of functioning AVF in renal transplant patients on fibrosis, inflammation and LVH indicators. Clinical and laboratory parameters will be compared in a group of 150 patients, 75 patients with a functioning fistula and 75 patients with inactive vascular access. We will assess the impact of functional AVF and the levels of biomarkers on the survival of patients and transplanted kidneys.

Arteriovenous fistulae are artificial connections between the artery and vein in the arm which allow needles to be inserted for haemodialysising patients wit kidney failure. Occasionally severe debilitating pain can arise from these fistulae for which no cause can be found. Such pain can be very difficult to treat. Many commonly used used painkillers are known to cause significant side effects in patients with renal failure (drowsiness, confusion etc. Qutenza (topical capsaicin 8%) is a new treatment made from chilli peppers which is applied to the skin as a patch and works directly at the nerve endings in the skin to prevent pain. It therefore should not have the systemic side effects of other drugs. It has been demonstrated to be beneficial in other painful conditions for example post-shingles pain and nerve pain from HIV. It has never been used for critical ischaemia before. We propose to investigate the efficacy of Qutenza in treating patients with end stage renal failure and chronic pain from their fistulae (AVF). We will recruit 20 patients with painful AVF and treat them with Qutenza. We will follow them up for 12 weeks and monitor the change in their pain scores.

The purpose of this study is to analyze and identify pre-, intra-, and post- operative parameters that predict Steal-Syndrome with distal malperfusion after Arterio-Venous Fistulas (AVF) as primary endpoint. Secondary endpoints are pre-, intra-, and post- operative parameters that predict patency and fistula maturation.

Use of arteriovenous fistula for IV drug administration is controversial and often prohibited by nephrologists. However, we have been using this method in our department for years now in order to keep the patients 'veins for other fistulas in the future. The aim of this study is to evaluate our practice and maybe provide a justification for a larger multi-center study given the importance of this subject in patients with chronic renal failure.

The study consist of a retrospective analysis of the etiologies, investigations and outcomes of patients presenting between 2005 to 2010 with hemoptysis in a North-American Tertiary center.

The aim of this study is to provide an overview of the possible applications of DUS during the maturation and postoperative follow-up of vascular access, with particular emphasis to establish a relationship between doppler Ultrasound parameters including: Flow volume. Outflow vein diameter. Outflow vein depth. Resistive index.