Evaluation of the Implantation of the End-vascular Creation of the Arteriovenous Fistulas in Patients in the University Hospital of Araba. Pilot Study.

Inclusion Criteria:

• Adult (older than 18).
• Currently be receiving chronic dialysis, or be waiting to start the chronic dialysisin the next six months.
• Have veins with diameter >= 2.0mm to the creation of the fistula, established byDuplex ultrasound or venogram.
• Have arteries with diameter >= 2.0mm to the creation of the fistula, established byDuplex ultrasound or venogram.
• Cubital and radial arterial flow for the hand, confirmed with Duplex Ultrasound and/orAllen test.
• Dismissed the realization of cephalic-radius FAVI for surgical technical problems.
• Informed Consent to participate in the study.

Exclusion Criteria:

• Known central venous stenosis or narrowing of the central vein > 50% according toimages on the same side as the creation of the planned FAV.
• Absence of perforator that feed the target cannulation, by venogram.
• Occlusion or stenosis > 50% of the cephalic basilica vein of the target cannulation.
• Cannulation target vein of less than 2.0 mm of diameter.
• Significantly compromised flow (>= 50% of stenosis) in the treatment arm as determinedby the doctor and the images.
• Ejection fraction documented <= 35% in the last 6 months.
• Pregnant women.
• Heart failure Class III or IV of the New York Heart Association (NYHA).
• Hypercouagulability status demonstrated ( Antiphospholipid Syndrome, Leiden factor V,Protein deficit S, ...).
• Known hemorrhagic diathesis.
• Documented history of drug abuse including intravenous drugs within six months of FAVcreation.
• Concomitant major surgical procedure "planned" within three months of recruitment ormajor previous surgery within 30 days of recruitment.
• Known iodine contrast allergy that cannot be properly premedicated.
• Known adverse effects for sedation and/or anesthesia that cannot be properlypremedicated.
• Evidence of active infections on the day of the index procedure.
• Life expectancy < 1 year.
• The patient is not willing to provide an written informed consent, is notgeographically stable and/or is not willing to cmply with the required follow-up.
• Patient with an objective cannulation vein of more than 6 mm of deep that wouldrequire a transposition procedure, defined as the elevation of an objectivecannulation vein nad the creation of a new fistula AV.
• The patient is nit willing to undergo of second stage, defined as a conversion tosurgical FAVI, central catheter arrangement, thrombectomy/rescue fibrinolysis, stenoicarea angioplasty, ...