In a patient who is on mechanical ventilation, recovery of spontaneous breathing is most likely to be delayed if which of the following findings is noted on examination?
A precipitant of respiratory failure is still present
Fractional inspired O2 (FiO2) is ≤ 0.5
Positive end-expiratory pressure (PEEP) is ≤ 7.5 cm H2O
The patient is breathing slowly and deeply during a trial of spontaneous breathing
