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Introduction: Coronavirus disease 2019 (COVID-19) is characterized by hyperinflammation and coagulopathy. Severe cases often develop respiratory distress, requiring mechanical ventilation and with critical cases progressing to acute respiratory distress syndrome. Control of hyperinflammation has been proposed as a possible therapeutic avenue for COVID-19; extracorporeal blood purification (EBP) modalities offer an attractive mean to ameliorate maladaptive inflammation. With this work, we evaluated the longitudinal changes of systemic inflammatory markers in critically ill COVID-19 patients treated with blood purification using AN69ST (oXiris®) haemofilter. Methods: We performed a time-series analysis of 44 consecutive COVID-19 cases treated with the AN69ST (oXiris®) cytokine adsorbing haemofilter (CAH) according to local practice; we visualize longitudinal results of biochemical …