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Blood-dialysate equilibration during continuous arteriovenous hemodialysis
T L Pallone1, S Hyver, J Petersen
1Division of Nephrology, Stanford University Hospital, CA.
ASAIO Transactions
|July 1, 1988
Summary
Urea concentration equilibration in continuous arteriovenous hemodialysis (CAVHD) was studied. Urea clearance approximated dialysate flow up to 15 ml/min, with incomplete equilibration at higher rates.
Area of Science:
- Nephrology
- Biomedical Engineering
- Renal Replacement Therapy
Background:
- Continuous arteriovenous hemodialysis (CAVHD) is a renal replacement therapy.
- Understanding solute transport, specifically urea, is crucial for optimizing CAVHD efficiency.
- Equilibration of urea concentration between blood and dialysate impacts dialysis effectiveness.
Purpose of the Study:
- To determine the extent of urea concentration equilibration during CAVHD.
- To evaluate the relationship between dialysate flow rate and urea clearance.
- To assess the performance of the Hospal AN69S dialyzer in urea removal.
Main Methods:
- CAVHD circuits with Hospal AN69S dialyzers were used.
- Bovine blood with a known urea concentration was perfused.
- Countercurrent dialysate flow rates of 10, 20, and 30 ml/min were applied.
- Near-zero net ultrafiltration was maintained.
Main Results:
- Urea clearances approximated dialysate inflow rate up to approximately 15 ml/min.
- At higher dialysate flow rates (30 ml/min), urea equilibration was incomplete.
- Measured urea clearance at 30 ml/min dialysate flow was 24.7 +/- 0.5 ml/min.
- A simplified urea transport model accurately simulated the experimental data.
Conclusions:
- Dialysate flow rate significantly influences urea equilibration during CAVHD.
- Optimal dialysate flow rates are necessary to achieve efficient urea removal.
- The Hospal AN69S dialyzer performance is dependent on dialysate flow dynamics for urea transport.