# ECMO loop not removing CO2 properly

**URL:** https://discourse.kitware.com/t/ecmo-loop-not-removing-co2-properly/1104
**Category:** Uncategorized
**Created:** [September 13, 2023, 6:02pm UTC](https://discourse.kitware.com/t/ecmo-loop-not-removing-co2-properly/1104 "2023-09-13T18:02:28Z")
**Posts on this page:** 1
**Page:** 1

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### Author: ![rene\_64](https://discourse.kitware.com/user_avatar/discourse.kitware.com/rene_64/32/746_2.png) [@rene\_64](https://discourse.kitware.com/u/rene_64)
#### Post date: [September 13, 2023, 6:02pm UTC](https://discourse.kitware.com/t/ecmo-loop-not-removing-co2-properly/1104/1 "2023-09-13T18:02:28Z")

</div>

I have a script that sets up an ECMO loop and is supposed to remove CO2 from the blood that passes through the ECMO circuit. However I noticed that the aorta’s pCO2 does not change based on the rate of CO2 removal from the ECMO loop. It only changes when the blood flow rate is changed. Have I setup the CO2 removal incorrectly? This is my code:

settings.get\_substance\_concentration(“CarbonDioxide”).get\_concentration().set\_value(list(results)[31] - 0.00013555, MassPerVolumeUnit.g\_Per\_dL)

Where results[31] is the CO2 concentration from the ECMO blood sampling port.