The nurse is caring for a patient on a mechanical ventilator due to respiratory failure. The ventilator is set at a FiO2 of 80% with orders to titrate down as tolerated. The nurse understands that the FiO2 goal is to be less than:



•Prolonged FiO2 of 50% or greater can lead to oxygen toxicity and atelectasis.

•Ideally, the FiO2 should be titrated down to 21%, or room air.

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