Despite anticoagulation, a high number of patients with ARDS secondary to COVID-19 developed life-threatening thrombotic complications. Higher anticoagulation targets than in usual critically ill patients should therefore probably be suggested.

150 COVID-19 patients were included (122 men, median age 63 years, SAPSII 49 points).

64 clinically relevant thrombotic complications were diagnosed in 150 patients, mainly pulmonary embolisms (16.7%).

28/29 patients (96.6%) receiving continuous renal replacement therapy experienced circuit clotting.

3 thrombotic occlusions (in 2 patients) of centrifugal pump occurred in 12 patients (8%) supported by ECMO.

All patients referred to 4 intensive care units (ICUs) from two centers of a French tertiary hospital for acute respiratory distress syndrome (ARDS) due to COVID-19 between March 3rd and 31st 2020 were included.

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