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Course of ventilatory settings and PaO2/FiO2 ratio in a critically ill 79‐year‐old Japanese man with COVID‐19. Light gray shading indicates prone ventilation values over time. Dark gray shading indicates a tidal volume between 6 and 8 mL/kg. Although PaO2/FiO2 improved during prone ventilation, it deteriorated following return to the supine position. Tidal volume was maintained between 6 and 8 mL/kg (predicted body weight). PEEP, positive end‐expiratory pressure.
