TO014COMPARISON BETWEEN HIGH FLUX-HD AND OL-HDF ON SURVIVAL AND ADEQUACY: TEN YEARS EXPERIENCE

Abstract Background and Aims Four RCTs have been published that compared on-line HDF (Ol-HDF) with HD. However, to date, an indisputable answer in determining whether patients treated with Ol-HDF had a better survival than those treated with high-flux HD (Hf-HD) has not been reached. The aim of our study was to retrospectively evaluate the impact of the dialysis modality (Hf-HD, Ol-HDF or acetate-free biofiltration AFB) on patient survival and dialysis adequacy. Methods We retrospectively evaluated all the incident patients that started dialysis due to uremia from 01-01-2008 to 31-12-2018 at the U.O. Nephrology ASST Spedali Civili of Brescia. Exclusion criteria were: duration of dialysis treatment less than 3 months, and previous dialytic treatment or kidney transplantation. The dialysis modality performed (Hf-HD vs Ol-HDF), the modality of infusion (pre-dilution or post-dilution) and mean total convective volume (replacement fluid volume + ultrafiltration) during last year’s dialysis session in Ol-HDF were analyzed for each patient. Results During observation 677 patients started HD treatment. 70 patients were excluded due to less than 3 months HD treatment. 607 patients (male 390, 64%) were analyzed. 467 pts (77%) were treated with Hf-HD, 103 pts (17%) with Ol-HDF, 36 pts (6%) with AFB. Median duration of HD treatment was 2.6 years (IQR 1.3; 4.7). Ol-HDF was performed in post-dilution mode in 60% of cases (total convective volume 25±4 L); pre-dilution mode was used in 40% of the cases (total convective volume 51±18 L). Patients in the Ol-HDF group were significantly younger than those in Hf-HD and AFB groups (respectively 59±15 years vs 71±15 vs 78±9, p