An Adult Patient with ARDS Is Being Ventilated with VC-CMV

An adult patient with ARDS is being ventilated with VC-CMV.The settings are: f = 14 breaths/min; Vᴛ = 375 mL; PEEP = 16 cm H₂O; and FɪO₂ = 0.8.The patient's ABG values are: pH = 7.40; P₂CO₂ = 56 mm Hg; P_aO₂ = 48 mm Hg; and S_aO₂ = 83%; the mean airway pressure is 18 cm H₂O.The patient's physician decides on a trial of HFOV.What initial ventilator settings should be used?

A) Bias flow = 30 L/min; mP_aw = 23 cm H₂O; set power to obtain ΔP = 76 cm H₂O; f = 6 Hz; TI = 33%; FɪO₂ = 1.0
B) Bias flow = 35 L/min; mP_aw = 76 cm H₂O; set power to obtain ΔP = 33 cm H₂O; f = 10 Hz; TI = 50%; FɪO₂ = 1.0
C) Bias flow = 20 L/min; mP_aw = 18 cm H₂O; set power to obtain ΔP = 76 cm H₂O; f = 8 Hz; TI = 33%; FɪO₂ = 1.0
D) Bias flow = 30 L/min; mP_aw = 30 cm H₂O; set power to obtain ΔP = 56 cm H₂O; f = 6 Hz; TI = 50%; FɪO₂ = 1.0

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