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NCT02056704
The reason the investigators are doing this study is to compare the results of angiography versus angiography with intravascular ultrasound in dialysis grafts/fistulas that are blocked.
NCT05906550
The FLOW trial evaluates the follow-up of the vascular access for hemodialysis. In current clinical care, vascular access flow volume is periodically assessed to detect and treat asymptomatic stenosis. The FLOW trial will determine whether it is safe to abandon this practice of active surveillance. Vascular access stenosis will then be treated only when clinical problems of flow dysfunction occur during hemodialysis. The investigators expect that the intervention rate and medical costs will be reduced by 40% when correction of vascular access stenosis is triggered by clinically apparent access dysfunction rather than asymptomatic flow reduction.
NCT06868901
A well-functioning hemodialysis vascular access is a decisive factor in the survival of hemodialysis patients, who have a high mortality rate. 85% of these hemodialysis patients, are treated via an arteriovenous fistula (AVF). However, the primary patency of AVFs at 1 year is 60%, mainly due to neointimal hyperplasia developing in the drainage vein, which leads to stenosis and, if left untreated, thrombosis of the AVF. Indeed, forty percent of hemodialysis patients require re-intervention on their vascular access within the year, due to stenosis on their AVF. Transluminal angioplasty (TLA) is currently used as first-line treatment for these stenoses but TLA itself causes vascular damage, with early recurrence of the stenosis in 50% of cases at 6 months, and necessitating repeated interventions. In recent years several endovascular techniques have been developed to limit the risk of re-stenosis, none of which have produced significantly better results than simple TLA. Eliminating intimal hyperplasia using a minimally invasive endovascular technique, rather than crushing it with simple angioplasty, would improve restenosis-free survival in these patients. Today, endovascular rotational atherectomy techniques are available to improve the patency of angioplasty in the treatment of complex arterial lesions of the coronary arteries and lower limbs. The atherotome is a guide-mounted catheter with a small burr at its distal end, which resects the atheromatous plaque whereas angioplasty simply crushes it. Atherectomy is followed by drug-eluting balloon (DEB) angioplasty with paclitaxel release to limit restenosis through its anti-inflammatory and anti-proliferative activity. A few cases of rotational atherectomy for the treatment of calcified stenoses in saphenous vein coronary bypasses have been reported in the literature, with encouraging results. If AVF re-stenosis should occur, the intimal hyperplasia can be removed endovascularly, thereby limiting the risk of short-term iterative stenosis. The aim of this study was to compare the 6-month re-stenosis rate with this technique (atherectomy + drug-eluting balloon) versus standard angioplasty + drug-eluting balloon for the treatment of restenosis of hemodialysis vascular accesses.
NCT05105503
This study will enroll end-stage renal disease (ESRD) patients on hemodialysis with a maturing arteriovenous fistula (AVF) for hemodialysis access. A study staff member will mark with indelible ink on each participant's skin the three sites on the upper extremity where the Eko CORE digital stethoscope will be used to take sound recordings. 9 recordings will be taken (3 at each site) once per week during weekly dialysis treatments.
NCT05410691
Cannulation of complex arteriovenous fistula (AVF) or graft (AVG) is a challenge to renal nurses. Ultrasound (US) guidance on central and peripheral venous access visualisation has been widely adopted in nephrology and shown to reduce complications of vascular interventions. With broader adoption of handheld US devices in clinical services, renal nurses could acquire this point-of-care technique to increase the successful cannulation rate while facilitating confidence build-up during training and practice. We aim to evaluate the use of handheld US on difficult AVF/AVG cannulation in a hospital-based dialysis unit.
NCT05360394
Arteriovenous Fistula (AVF) is a surgically created circuit used for hemodialysis in patient with End Stage Renal Disease (ESRD). A functioning dialysis vascular access is critical to the delivery of life-saving hemodialysis (HD) treatment for these patients. Unfortunately, neointimal hyperplasia frequently occurs within the dialysis vascular access, resulting in stenosis, poor flow and thrombosis with loss of function. The cephalic vein forms the outflow conduit for radiocephalic (RC) and brachiocephalic (BC) AVF. At the perpendicular portion of the cephalic vein, the cephalic arch is often prone to developing hemodynamically significant stenosis. The prevalence of cephalic arch stenosis is reported to be 39% in brachiocepahlic and 2% in radiocephalic AVF. The current gold standard therapy for treatment of AVF stenosis is plain balloon angioplasty (BA). Paclitaxel coated balloon (PCB) angioplasty has also been shown recently to be superior to plain BA in the treatment of stenosis in dialysis vascular access. By releasing paclitaxel, which is an anti-proliferation drug, locally into the vessel wall during balloon contact, it will blunt the acceleration of intimal hyperplasia response, resulting in improved primary patency after angioplasty. The use of stent grafts for recurrent CAS has been demonstrated to increase patency of AVF compared to BA and bare stents. However, stent grafts are prone to edge restenosis that tend to occur within 5mm of each end of SG due to neointimal hyperplasia from the end of the stent migrating towards the center. We postulate that stent graft with PCB angioplasty of the stent edge is more effective than PCB alone in maintaining the patency of AVF with cephalic arch stenosis. Therefore, we aim to perform a randomized controlled trial to compare the 6-month unassisted patency rate of treatment of recurrent CAS with stent graft and PCB angioplasty of both stent edge versus PCB alone.
NCT05333640
Drug-coated balloon (DCB) angioplasty has been shown to be superior to POBA in the treatment of stenosis in AVF. This is because the very intervention used to treat underlying stenosis by POBA can induce vascular injury and accelerate intimal hyperplasia, resulting in rapid restenosis and need for repeated procedure to maintain vessel patency. The anti-proliferative drug that is coated on the surface of balloon is released to the vessel wall during balloon angioplasty and blunt the acceleration of intimal hyperplasia response, resulting in improved primary patency after angioplasty. Additionally, unlike stents, DCB does not leave a permanent structure that may impede future surgical revision. Recent randomized control trials (RCT) have shown the superiority of paclitaxel durg-coated balloon (PDCB) over POBA in the treatment of stenosis in AVFs. In a large multicenter RCT, PDCB was demonstrated to result in a 6-month target lesion primary patency of 82.2% compared to 59.5% for POBA. However, concerns had also arisen recently in the use of PDCB. In large lower limb studies involving the use of paclitaxel devices, meta-analysis by Katsanos et al had revealed increased late risk mortality in patient that are treated with PDCB or paclitaxel-coated stent. Sirolimus drug-coated balloon (SDCB) is the new generation of drug eluting balloons that are available in the market. Compared to paclitaxel, sirolimus is cytostatic in its mode of action with a high margin of safety. It has a high transfer rate to the vessel wall and effectively inhibit neointimal hyperplasia in the porcine coronary model. The effectiveness of SDCB in patients with dialysis access dysfunction has been shown in a small pilot study in AVF stenosis and AVG thrombosis. SAVE AVF registry ams to assess the efficacy and safety of SDCB vs PDCB angioplasty.
NCT05018962
To determine if cutting balloon angioplasty combined with DEB angioplasty provides a higher primary patency after treatment of recurrent stenoses compared with cutting balloon angioplasty or angioplasty using DEB alone in the venous outflow AVFs. For cutting balloon angioplasty in venous stenosis, the primary patency after 12 months is 55-60% (9,16) and in recurrent stenoses up to 48%(10). We hypothesise that DEB angioplasty after cutting balloon angioplasty leads to improved primary patency at 12 months.