The aim of this study is to evaluate the removal of midle molecules and inflammatory cytokines with the Theranova-500 ™ dialyzer (medium cut-off membrane, Baxter®) versus a high flux dialyzer Elisio-21H ™ (High-flux membrane, Nipro®) in chronic hemodialysis.

Evaluation of nutritional parameters, inflamatory parameters and oxidative stress will also be carried out.

Finally, the investigators will compare hepcidin levels and the erythropoietin resistance index between the two groups.

Inclusion Criteria:

• Age ≥ 18 years
• Patient suffering from chronic terminal renal failure excluding nephropathy with myelomatous cylinders, hemodialysis for more than 6 months,
• Patient under dialyser Elisio-21H ™ for more than 3 months
• Patient including the protocol scheme and able to comply with it
• Free subject, without guardianship or curatorship or subordination
• Patients benefiting from a Social Security scheme or benefiting from it through a third party
• Non-opposition given by the patient after clear and fair information on the study

Exclusion Criteria:

• Age <18 years
• Patient with an associated pathology (evolutionary cancer, progressive infectious disease or chronic inflammatory disease) that may excessively influence CRP levels (CRP> 60 mg / L)
• Patient following another protocol of research or period of exclusion of another protocol
• Patients not benefiting from a Social Security scheme or not benefiting from it through a third party
• Persons benefiting from enhanced protection, namely minors, persons deprived of their liberty by a judicial or administrative decision, persons staying in a health or social institution, adults under legal protection, and finally patients in emergencies .
• Pregnant or nursing women, women of childbearing age who do not have effective contraception (hormonal / mechanical: oral, injectable, transcutaneous, implantable, intrauterine device, or surgical: tubal ligation, hysterectomy, total ovariectomy ).