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Related Experiment Videos

Mid-dilution: the perfect balance between convection and diffusion.

A Santoro1, P A Conz, V de Cristofaro

  • 1U.O. Nefrologia e Dialisi Malpighi, Policlinico S. Orsola-Malpighi, Bologna, Italy.

Contributions to Nephrology
|May 7, 2005
PubMed
Summary

Mid-dilution hemodiafiltration (MD HDF) significantly enhances the removal of small and middle molecules compared to standard hemodialysis. This innovative technique offers improved clearance, making it a promising advancement in dialysis therapy.

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Area of Science:

  • Nephrology
  • Renal Replacement Therapy
  • Convective Clearance

Background:

  • Hemodiafiltration (HDF) improves middle molecule clearance but lacks consensus on optimal reinfusion timing.
  • Mid-dilution hemodiafiltration (MD HDF) utilizes a novel dialyzer design for integrated pre- and post-filter reinfusion.
  • This technique supports higher reinfusion rates, potentially enhancing solute removal efficiency.

Purpose of the Study:

  • To compare the solute removal characteristics of MD HDF with conventional high-flux hemodialysis (HD).
  • To evaluate the efficacy of MD HDF in removing small solutes and middle-molecular-weight toxins.
  • To assess the safety and tolerability of the MD HDF technique.

Main Methods:

  • A prospective, three-center, cross-over study involving 20 patients.

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  • Patients were randomized to either one week of high-flux bicarbonate HD followed by MD HDF, or vice versa.
  • Evaluated parameters included instantaneous clearance, dialysis reduction ratio, and total mass removal for various solutes (urea, creatinine, beta2-microglobulin, etc.).

    • Main Results:

    • MD HDF demonstrated significantly higher instantaneous clearance for urea, creatinine, phosphate, beta2-microglobulin, angiogenin, and leptin compared to HD.
    • The MD HDF filter's design facilitates higher reinfusion rates, leading to enhanced removal of middle-molecular-weight toxins.
    • All treatments were well-tolerated with no reported adverse reactions.

    Conclusions:

    • MD HDF offers a significant improvement in the removal of both small and middle molecules.
    • The unique configuration of the MD HDF filter enables high-efficiency HDF with superior solute clearance.
    • MD HDF supports higher ultrafiltration rates, contributing to more effective toxin removal in dialysis patients.