Haemodiafiltration versus high-flux haemodialysis-a Consensus Statement from the EuDial Working Group of the ERA

Haemodialysis (HD) is a life-saving therapy for individuals with kidney failure. Post-filter haemodiafiltration (HDF) and high-flux HD are the most widely used treatment modalities. To date, five randomized controlled trials (RCTs) have been performed that compare all-cause and cardiovascular (CV) mortality between HDF and low- or high-flux HD in adults receiving maintenance dialysis for at least 1 year. RCTs, meta-analyses and pooled individual patient data analyses have been published on this topic. However, all of them are limited by the heterogeneity of inclusion criteria and significant methodological shortcomings, including informative selection bias and the exclusion of poorly performing patients from the HDF arm after randomization. Given this background, the European Dialysis Working Group of the European Renal Association presents a Consensus Statement on HDF and high-flux HD, addressing three key outcomes: survival, health-related quality of life, and biochemical endpoints. A separate section is dedicated to paediatric patients. We searched five large electronic databases to identify parallel or cross-over RCTs comparing HDF with high-flux HD on pre-defined outcome measures. Using a mini-Delphi method, we developed 22 key consensus points by combining meta-analyses, clinical experience, and expert opinion. They aim to inform and assist in decision making and are not intended to define a standard of care. The key summary point is that HDF appears to be associated with improved overall and CV survival, provided high convection volumes are achieved. The generalizability of these findings to the entire dialysis population depends on the patient's overall health and requires further study.