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Changes of PaO2/FiO2 ratio before and after iNO administration in patients with COVID-19 ARDS. (A) Studies that showed a significant change in PaO2/FiO2 ratio after iNO administration. (B) Studies that did not show a significant change in PaO2/FiO2 ratio after iNO administration. Data represent mean or median according to the data presentation in the original study.
