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Long-term performance of hemofilters in continuous hemofiltration
J Schaeffer1, C J Olbricht, K M Koch
1Division of Nephrology, Hannover Medical School, Germany.
Nephron
|January 1, 1996
Summary
Polyamide hemofilters maintain consistent performance for over 72 hours in continuous hemofiltration. Routine filter changes are unnecessary within this period, improving patient care and resource management.
Area of Science:
- Nephrology
- Intensive Care Medicine
- Biomedical Engineering
Background:
- Continuous hemofiltration is a critical renal replacement therapy in intensive care.
- Hemofilter performance and longevity are key factors in treatment efficacy and cost-effectiveness.
Purpose of the Study:
- To evaluate the long-term filter performance of polyamide hemofilters.
- To determine the necessity of routine hemofilter replacement within the first 72 hours of continuous hemofiltration.
Main Methods:
- Six polyamide hemofilters were tested in intensive care patients undergoing continuous hemofiltration for over 72 hours.
- Sieving coefficients for urea, creatinine, and polyfructosan were measured.
- Hydraulic permeability and blood flow dynamics were monitored over time.
Main Results:
- Sieving coefficients for urea and creatinine remained near unity and constant.
- Polyfructosan sieving coefficient (0.75) and hydraulic permeability were unchanged throughout the study period.
- Linear relationships between blood pressure, blood flow, and filtration rate persisted without time-dependent changes.
Conclusions:
- Polyamide hemofilters demonstrate stable performance for at least 72 hours.
- Routine daily replacement of these hemofilters is not indicated within the initial 72 hours of treatment.
- Filter replacement should be considered only if a significant decline in filtration rate is observed.