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Nephrology Dialysis Transplantation, Vol 13, Issue 90005 3-11, Copyright © 1998 by Oxford University Press

ORIGINAL ARTICLES

On-line haemodiafiltration: state of the art

B Canaud, J Bosc, H Leray, F Stec, A Argiles, M Leblanc and C Mion
Nephrology Department and AIDER, Lapeyronie University Hospital, Montpellier, France

Faced with the shortcomings of conventional dialysis on a long-term basis, as illustrated by the dialysis-related pathology, a need for a new strategy exists to improve the overall quality of treatment in end-stage renal failure (ESRF) patients. On-line haemodiafiltration (HDF) seems to be the best therapeutic option to achieve this goal at the present time. By enhancing convective clearances through highly permeable membranes, HDF offers the greatest solute fluxes both for low and higher molecular weight uraemic toxins. As for example, in our routinely performed HDF programme based on 3 weekly sessions lasting 3-4 h each, double-pool urea Kt/V achieved was 1.55±0.20 and {beta}2-microglobulin Kt/V was 0.91. By producing substitution fluid from fresh dialysate, the technique of HDF is simplified and becomes economically affordable. By improving the haemodynamic tolerance, HDF allows more elderly and high risk cardiovascular patients to be treated more safely. By using bicarbonate-buffered infusate, HDF facilitates the correction of acidosis. Both by using ultrapure bicarbonate dialysate and down-regulating the membrane reactivity via a 'protein cake', HDF introduces the first step for a full haemocompatibility concept. Finally, by giving access to virtually unlimited amounts of sterile and non-pyrogenic fluid, HDF should introduce new therapeutic options such as a totally automated and feed-back-controlled machine. Today's on-line HDF is already a step forward to enhance the overall efficacy of renal replacement therapy and to improve the global care of ESRF patients.Key words: end-stage renal failure; on-line haemodiafiltration; renal replacement therapy; dialysis
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