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EC CO2R: oxygenator or hemodialyzer? An in vitro study
J P Gille1, A Lautier, B Tousseul
1Inserm U 14, CHRU Nancy-Brabois, France.
The International Journal of Artificial Organs
|April 1, 1992
Summary
Extracorporeal CO2 removal (EC CO2R) enhances respiratory support. Acidifying an oxygenator boosted CO2 transfer by 80%, but hemodialysis offered superior CO2 elimination for acute respiratory distress syndrome (ARDS) patients.
Area of Science:
- Respiratory Support
- Extracorporeal Circulation
- Medical Device Technology
Background:
- Acute respiratory distress syndrome (ARDS) requires effective respiratory support.
- Extracorporeal CO2 removal (EC CO2R) is a minimally invasive technique for CO2 elimination.
- EC CO2R can utilize oxygenators (dry form) or hemodialyzers (wet form).
Purpose of the Study:
- To investigate methods for increasing CO2 transfer in EC CO2R systems.
- To compare CO2 removal efficiency between oxygenators and hemodialyzers under various conditions.
- To evaluate the impact of acidification and alkalinization on CO2 transfer rates.
Main Methods:
- In vitro study using heated polyelectrolytic solutions mimicking venous blood.
- Tested four series: oxygenator with/without acidification, hemodialyzer with/without alkalinization.
- Measured CO2 transfer (TCO2) and outlet pH at liquid flow rates up to 0.330 L/min.
Main Results:
- Acidification of the oxygenator increased CO2 transfer by 80% compared to non-acidified conditions.
- Hemodialysis demonstrated more effective CO2 elimination than the oxygenator.
- Statistically significant differences were observed between the four tested methods.
Conclusions:
- Acidification is a viable strategy to enhance CO2 transfer in oxygenators for EC CO2R.
- Hemodialysis offers superior CO2 elimination efficiency compared to oxygenators in EC CO2R.
- Optimizing EC CO2R techniques is crucial for improving respiratory support in ARDS.