Bicarbonate vs Heparin Catheter Lock in Chronic Hemodialysis Patients

Inclusion Criteria: * Patients who accept participation and sign informed consent. * Incident or prevalent chronic hemodialysis patients who receive at least 2 sessions per week with 1 month of clinical stability defined as: no hospitalizations, no vascular access infections, no changes in blood flow prescription due to vascular access dysfunction. * Patients with temporal catheter (Niagra 13.5 French/20 cm length, BARD Access System, Salt Lake City, Utah, USA) as vascular access for hemodialysis. Exclusion Criteria: * Catheter dysfunction at baseline * On anticoagulation therapy * Patients with known coagulopathy or hemophilia * Patients with Child-Pugh B or C liver failure * Patients with thrombocytopenia less than 100,000 u / L * Patients with central vessel stenosis and vena cava syndrome, previously documented. * Patients with vascular access exhaustion. * Patients who have undergone more than 2 vascular approaches for hemodialysis catheters. * Patients with heparin-induced thrombocytopenia