Hemodiafiltration reduces mortality compared to hemodialysis in kidney failure with dose-dependent benefits

1. Patients in the hemodiafiltration group reported a significant reduction in all-cause mortality compared to those in the hemodialysis group.

2. An inverse relationship was seen between convection volumes and mortality risk.

Evidence Rating Level: 1 (Excellent)

Study Rundown: High-dose hemodiafiltration has been associated with a significant reduction in mortality compared to conventional high-flux hemodialysis in patients with kidney failure. Yet, there are uncertainties regarding subgroup effects, dose-response relationships, and cause-specific mortality. This meta-analysis aimed to compare the impact of hemodiafiltration and standard hemodialysis on all-cause and cause-specific mortality. The primary outcome of this study was all-cause mortality, while the key secondary outcome included a dose-response relationship for convection volume. According to study results, hemodiafiltration significantly reduced all-cause mortality compared to hemodialysis, with no differences observed across subgroups. Although this study was well done, it was limited by a small number of trials, affecting the generalizability of the findings.

Click to read the study in The Lancet

Relevant Reading: Effect of Hemodiafiltration or Hemodialysis on Mortality in Kidney Failure

In-depth [meta-analysis]: MEDLINE, Embase, and Cochrane were searched from database inception to July 17, 2024. Included were patients with kidney failure who participated in randomized trials comparing online hemodiafiltration with standard hemodialysis, focusing on mortality outcomes. Altogether, 4153 patients (2083 receiving hemodiafiltration and 2070 receiving hemodialysis) were included in the final analysis. The primary outcome of all-cause mortality showed a significant reduction in the hemodiafiltration group compared to hemodialysis (23.3% vs. 27.0%, hazard ratio [HR] 0.84, 95% confidence interval [CI] 0.74-0.95). The secondary outcome of the dose-response analysis revealed a graded relationship between higher convection volumes and decreased mortality risk. Findings from this study suggest that online hemodiafiltration is superior to standard hemodialysis for reducing mortality in patients with kidney failure.

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