The aim will be to study possibility of hemodialysis sessions success, without perdialytic anticoagulation but with adequate dialysis parameters (defined by the patient's Kt / V machine), in patients treated by long-term anticoagulation with VKA and dialysed with the HeprAN ™ membrane.
Use HeprAN ™ membrane (coated with heparin) should be allow the success of dialysis sessions, with adequate dialysis parameters, in patients treated by long-term anticoagulation with VKA, without addition of heparin perdialytic.~Less use of heparin (UFH or LMWH) during hemodialysis session should be allow a decrease of bleedings (moderate or major) and blood transfusions for hemodialysed patients with HeprAN ™ membrane and treated by long-term anticoagulation with VKA