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Protein loss in on-line hemofiltration
Antonio Santoro1, Cristina Canova, Elena Mancini
1Division of Nephrology and Dialysis Malpighi, Policlinico S. Orsola-Malpighi, Bologna, Italy. santoro@orsola-malpighi.med.unibo.it
Blood Purification
|May 19, 2004
Summary
Albumin loss during hemodialysis is lower with pre-dilution hemofiltration compared to post-dilution. Pre-dilution minimizes protein loss, safeguarding nutritional status in uremic patients undergoing renal replacement therapy.
Area of Science:
- Nephrology
- Biochemistry
- Medical Technology
Background:
- Serum albumin levels are critical nutritional indicators for hemodialysis patients.
- High-flux hemodialysis may lead to albumin loss through the membrane, impacting patient nutrition.
- Understanding albumin loss mechanisms is vital for optimizing dialysis treatments.
Purpose of the Study:
- To compare albumin loss during pre-dilution and post-dilution hemofiltration.
- To investigate the impact of dialysis techniques on protein metabolism.
- To identify factors influencing albumin loss during convective treatments.
Main Methods:
- Twenty stable patients on chronic renal replacement therapy were enrolled.
- Four hemofiltration treatments were performed per patient: two pre-dilution (pre-D) and two post-dilution (post-D).
- A polyamide membrane (Poliflux, 2.1 m2) was used for all treatments.
Main Results:
- Albumin loss was significantly lower in pre-D (1.7 +/- 0.8 g) than in post-D (2.9 +/- 1.5 g).
- Transmembrane pressure correlated with albumin loss, with higher losses observed in post-dilution at equivalent pressures.
- Overall albumin loss per treatment was less than 3 g.
Conclusions:
- Convective treatments, especially pre-dilution hemofiltration, can be performed without significant albumin loss.
- Pre-dilution reduces protein contact with the membrane, thereby minimizing albumin loss.
- Transmembrane pressure is a key factor influencing protein loss in post-dilution hemofiltration.