Improving Arteriovenous Fistula Patency

"Doppler ultrasound and transonic dilution method technique will be performed in the experimental group quarterly.~QA will be measured by both techniques and haemodynamic repercussion stenosis will be evaluated by doppler ultrasound."

Effective blood flow, venous pressure, arterial pressure, at the beginning and at the end of the dialysis session

Predialysis physical examination of AVF every dialysis session.

Weekly ktv measurement using biosensors. In patients who have been dialyzed in monitors with no biosensors, ktv will be measured monthly using monocompartimental Daugirdas equation

Quarterly recirculation with urea method.