View clinical trials related to Arteriovenous Fistula.
Filter by:This is a two stage, prospective, multi-center study to evaluate the EchoMark and EchoSure devices in patients undergoing peripheral arteriovenous fistula creation for hemodialysis access.
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 1. The strength of the present study is the prospective design that allows complete collection of parameters and outcomes. 2. The predictor of interest for AVF maturation is luminal pressure of AVF. 3. The study assesses hemodynamic parameters of AVF and its branched veins, including diameters, flow rates, and flow volume. 4. The luminal pressure of AVF will be estimated using Modified Bernoulli Equation. 5. The primary outcome of the study is spontaneous AVF maturation.
Arteriovenous fistula (AVF) is considered the gold standard for safe and effective vascular access during hemodialytic treatment. It is known that systemic aerobic exercise is capable of promoting peripheral vasodilation, however, its effects on AVF are unknown. For this reason, we will evaluate the effects of aerobic exercise on a stationary bicycle over the AVF caliber.
The number of hemodialysis patients in the world are increasing. In order to receive a sufficient dialysis, the patients needs a well functioning and stable vascular access - preferably an arteriovenous fistula (AVF). Unfortunately, the AVF has a high incidence of stenosis with percutaneous trans luminal angioplasty (PTA) as the only treatment option and a short lifetime. Little do we know of how to improve the survival of the AVF. With this study we want to explore the effect of far infrared therapy on the stenosis, maturation and survival of the arteriovenous fistula. The investigators will divide the patients into 2 groups: A treatment group and a control group. The treatment group will receive infrared therapy on their fistula during their dialysis session. The control group will not receive any infrared therapy. The investigators hope to reduce the risk of stenosis in the fistula and improve the fistula survival with this treatment. Furthermore, the investigators want to explore the change in several biochemical markers during the treatment with infrared therapy.
For chronic hemodialysis patients, the creation of a well-functioning arteriovenous (AV) fistula is critical for ensuring that patient receive adequate hemodialysis. Unfortunately, the primary failure rate for AV fistulas after surgery is about 40%, and this percentage has not changed despite a number of trials of pharmaceutical agents and biologic agents. A key to success in the development of a useable AV fistula is an adequate arterial and venous diameter in the access forearm. Although exercise is commonly used to increase vessel diameter after AV fistula placement, Investigators are unaware of published studies that report on the effect of exercise prior to AV fistula placement to assist with the maturation of a newly created AV fistula. In this pilot trial, the Principal Investigator will evaluate the feasibility and possible benefits of pre-surgical exercise on forearm AV fistulas.
- Review the outcomes of the Endovascular management of pediatric intracranial arteriovenous shunts. - Give an effective treatment for pediatric intracranial arteriovenous shunts and can detect the best method could be used and assess safety and efficacy of different endovascular techniques in treatment of different AV shunts. - Improve the outcome of these patients and decease rate of recurrence and complications.
Computed tomography (CT) is the modality of choice to characterize pulmonary arteriovenous malformations (PAVMs) in patients with hereditary haemorrhagic telangiectasia (HHT). The objective of this study was to determine if CT findings were associated with frequency of brain abscess and ischaemic stroke. This retrospective study included patients with HHT-related PAVMs. CT results, PAVM presentation (unique, multiple, disseminated or diffuse), the number of PAVMs and the largest feeding artery size, were correlated to prevalence of ischaemic stroke and brain abscess.
This study will investigate the effect of pre-operative exercise on hemodynamics in the fistula artery and vein, Pre and Post Arteriovenous Fistula Formation as well as the suitability of Cannulation of Arteriovenous Fistula at 12 weeks Post Surgery. This is a randomised control study with 20 patients each in the Control arm (Group A) or the Exercise arm (Group B). The subjects will be randomised into 1:1 into one of the two groups. The patients will have an ultrasound doppler vein mapping done prior surgery and the necessary follow up visits.
This is a multicenter post-marketing clinical follow-up study to collect safety and performance data in a prospective cohort of patients who will have undergone coil embolization using the ED Coil and ED Detach Generator v4.
End stage renal disease patients (ESRD) should be educated to take care of their arteriovenous fistula (AVF). Educational programs should have clear objectives and the interventions should be well defined. Therefore, assessing the interventions that can have the strongest impact on the patient's acquisition of self-care behaviors with AVF is extremely important. The aim is to assess the effectiveness of a structured intervention on the frequency of self-care behaviors with AVF by patients with ESRD on hemodialysis (HD).