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Backdiffusion rather than backfiltration enhances endotoxin transport through highly permeable dialysis membranes
ASAIO Transactions
|July 1, 1990
Summary
Dialysate contamination poses a risk during hemodialysis with high-permeability membranes. Endotoxin transfer via diffusion necessitates rigorous dialysate purification to ensure patient safety.
Area of Science:
- Nephrology
- Biomedical Engineering
- Infectious Disease
Background:
- High-permeability dialysis membranes, used for beta-2-microglobulin removal, may facilitate endotoxin transfer from dialysate to blood.
- Endotoxin transfer via diffusion is less understood than backfiltration.
Purpose of the Study:
- To determine the diffusive and convective clearances for endotoxins.
- To assess the risk of endotoxin transfer through diffusion with high-permeability membranes.
Main Methods:
- Utilized conventional mass and momentum transfer models to calculate clearances.
- Evaluated endotoxin transport for molecular weights of 1,000 and 10,000 daltons.
Main Results:
- Fractional diffusive transport of endotoxins (1,000 and 10,000 Da) approached unity, indicating significant diffusion.
- Calculated diffusive endotoxin inflow rates for specific membranes (PAN-12CX2, MC0.8H) at a given dialysate concentration.
Conclusions:
- Rigorous dialysate purification is essential for safe hemodialysis when using highly permeable membranes.
- Preventing diffusive endotoxin inflow is critical to avoid patient exposure.