An 80 kg (176 lb) patient with ARDS is intubated and is rece…

An 80 kg (176 lb) patient with ARDS is intubated and is receiving mechanical ventilation with following settings: Mode  SIMV RR 10 Vt 700 ml PEEP 10 cm H20 FIO2 0.5 The respiratory therapist notes that the patient’s SpO2 has dropped from 98% to 85% over the past two hours.  The respiratory therapist notes the PIP has increased from 36 cm H20 to 46 cm H20 and the plateau pressure has increased from 28 cm H20 to 38 cm H20.  Which of the following should the respiratory therapist recommend?