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Blood urea clearance with microencapsulated urease
K B Lee1, D K Boadi, R J Neufeld
1Department of Chemical Engineering, McGill University, Montreal, Quebec, Canada.
Journal of Theoretical Biology
|August 7, 1995
Summary
Modeling the microencapsulated urease artificial kidney (MUAK) system shows optimal enzyme activity enhances urea removal. Higher flow rates improve patient blood urea reduction despite slightly lower conversion efficiency.
Area of Science:
- Biomedical Engineering
- Chemical Engineering
- Nephrology
Background:
- Kidney disease necessitates efficient blood purification methods.
- Artificial kidney systems aim to mimic natural kidney function.
- Microencapsulated urease artificial kidney (MUAK) offers a potential therapeutic approach.
Purpose of the Study:
- To model the response of kidney patients to MUAK treatment.
- To simulate patient response and reactor performance under various conditions.
- To identify optimal operating parameters for the MUAK system.
Main Methods:
- Mathematical modeling of the MUAK system and patient blood urea dynamics.
- Simulation of reactor performance with varying enzyme activity, dimensions, and flow rates.
- Analysis of urea reduction and conversion efficiency at different operational settings.
Main Results:
- Optimal urease enzyme activity was determined to be 10 mM sec-1.
- Reactor dimensions significantly influenced urea reduction, with 4 x 20 cm yielding 62% reduction.
- Increased flow rates enhanced overall blood urea reduction, reaching 76% at 400 ml min-1.
Conclusions:
- The MUAK system's performance is highly sensitive to enzyme activity and flow rate.
- Higher flow rates improve patient blood urea levels due to increased reactor volume turnover.
- The developed model accurately predicts MUAK performance and patient blood urea levels simultaneously.