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- W2969843908 abstract "Introduction: Extracorporeal gas exchange requires the passage of oxygen and carbon dioxide (CO 2 ) across an artificial membrane. Current European Union regulations do not require the transfer to be assessed in models using clinically relevant haemoglobin, making it difficult for clinicians to understand the CO 2 clearance of a membrane, and how it changes in relation to sweep gas flow through the membrane. The characteristics of membrane CO 2 clearance are described using a single membrane at different sweep gas flows in an in vitro model with clinically relevant haemoglobin concentrations using three separate methods of calculating CO 2 clearance. Methods: To define the CO 2 removal characteristics of the extra-corporeal CO 2 removal (ECCO 2 R) device, we devised an in-vitro gas exchange circuit formed by a dedicated ECCO 2 R circuit (ALung, Pittsburgh, USA) in series with two membrane oxygenators. The system was primed with donated expired human red cells provided by the local blood bank. The experimental set-up allowed constant CO 2 input (via one membrane oxygenator) with variable removal from a portion of the blood in a manner which was analogous to that seen in vivo. Blood gases were measured from different ports in the circuit in order to measure the experimental membrane CO 2 clearance (VCO 2 ). Results: Results demonstrate that the relationship between VCO 2 and gas flow at a constant blood flow of 0.4 L/minute with a haemoglobin of 7 g/dL increases sharply from a gas flow of 0 to 2 L/min but plateaus at gas flows >4 L/minute. VCO 2 , calculated using three different methods, showed a strong linear correlation with minimal bias. Conclusions: The CO 2 clearance of the membrane used in this bench test is non-linear. This has implications for clinical practice, especially during the weaning phase of the device." @default.
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- W2969843908 date "2019-08-23" @default.
- W2969843908 modified "2023-09-24" @default.
- W2969843908 title "In-vitro performance of a low flow extracorporeal carbon dioxide removal circuit" @default.
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- W2969843908 doi "https://doi.org/10.1177/0267659119865115" @default.
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