Heparinization vs Salinization of the Peripheral Venous Catheter

Inclusion Criteria: * Patients older than 18 yo, admitted to the Hospital Residencia Sant Camil * Patients with at least one peripheral venous line for discontinuous treatment, which has not been channeled in a medical emergency situation. * Written informed consent Exclusion Criteria: * Allergy to heparin * Patients treated with unfractionated sodium heparin. * Patients in dialysis * Patients with a venous catheter indicated for diagnosis tests. * Patients with a venous catheter indicated for blood transfusion * Severe heparin-induced thrombocytopenia in recent months * Active uncontrollable bleeding during admission * Brain aneurysm or dissecting aorta, except in association with corrective surgery. * Confirmed / suspected cerebrovascular hemorrhage * Severe uncontrolled hypertension * Severe alterations in platelet coagulation \<30,000, TP\> 1.7 APTT ratio\> 1.7 ratio. * Patient included in another clinical trial with drugs or procedures that may affect the patency of venous catheters.