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Recirculation Fraction Calculator

Recirculation fraction (RF) in ECMO (Extracorporeal Membrane Oxygenation) refers to the percentage of oxygen-rich blood that’s returned to the patient but then unintentionally drawn back into the ECMO circuit. This percentage shows how efficient the ECMO system is, as it reveals the mixing of oxygenated and non-oxygenated blood. The higher the recirculation fraction, the less effective the ECMO support becomes for the patient. To make sure the patient receives the best possible care, it’s essential to keep an eye on and minimize the recirculation fraction while they’re on ECMO therapy.

Recirculation Fraction (RF)= CPreO2 - CVO2) / (CPostO2 - CVO2) * 100

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