Active clinical trials for "Arteriovenous Fistula"

Arteriovenous fisutla (AVF) is the vascular access of choice for hemodialysis but has a high early failure (eAVFF) rate. eAVFF can be defined as thrombosis/stenosis and Doppler ultrasound (DUS)-based failure-to-mature parameters such as postoperative blood flow (PostQa) < 500 ml/min, AVF-vein diameter (PostVD) < 5 mm, and AVF-vein depth (PostVDepth) ≥ 6 mm. We explored whether common risk factors for eAVFF could predict these eAVFF parameters and venous distensibility: the latter is largely overlooked as a potential eAVFF parameter.

Arteriovenous fistulae are preferred among methods of providing blood access for hemodialysis. For each hemodialysis treatment, the fistula is cannulated usually with two needles. One, the arterial needle, allows the blood to be withdrawn from the patient into the dialysis circuit and then it is returned by the second or venous needle. The success of arteriovenous fistula cannulation is dependent on many variables and these are affect the dialysis adequacy.

Patients whose kidneys have failed need to receive dialysis treatment, most commonly with a dialysis machine. In order to be connected to the machine an operation is often performed to join an artery to a vein in the arm. This forms what is known as an arteriovenous fistula. The fistula causes an increase in the flow of blood through the vein and the vein reacts to this by becoming bigger and thicker, making it easier to connect the patient to the machine. The success rate for the operation is relatively low and only approximately 65 from every 100 operations is still working after a year. It is thought that one factor that may cause problems with the fistula is the ability of the vein to stretch in response to increased blood flow. Previous research has shown that veins in kidney failure patients look different to those of people whose kidneys are working when viewed under a microscope. The investigators aim to study the structure of the vein that is used in making fistulas with a microscope and also to test it in an engineering laboratory to see how much it will stretch. The investigators hope that gaining information about the structure of the vein and its ability to stretch will help determine what it is about the vein that affects how well it works as part of a fistula. This information may help surgeons select the best possible vein in a given patient to give the best chance of a working fistula in the future.

This project will bank sera, DNA and vascular specimens from patients undergoing arteriovenous fistula creation and revision.

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.

End-stage renal disease (ESRD) arises from many heterogeneous disease pathways that alter the function and structure of the kidney irreversibly, over months or years.End-stage renal disease (ESRD) arises from many heterogeneous disease pathways that alter the function and structure of the kidney irreversibly, over months or years. Haemodialysis (HD) is a lifeline therapy for patients with ESRD. Our study to compare methods of AVF creation, side to side and end to side . This randomized controlled trial .

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

A prospective longitudinal surveillance for a period of 2 months. Sample - identify suitable Chronic Kidney Disease (CKD) patients who undergo HD with functioning AVF. Participants at various age range and both sexes are recruited to observe their access flow, access recirculation and cardiac function and assess their relationship.

Study of the features of hemodynamic and clinical maturation of the native arteriovenous fistula for hemodialysis.

The purpose of this study is to determine if the creation of a fistula or a graft plays a role in the development of heart disease for patients undergoing hemodialysis