A PaO2/FiO2 ratio of 150 with PEEP ≥5 cm H2O falls into which ARDS category?

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Multiple Choice

A PaO2/FiO2 ratio of 150 with PEEP ≥5 cm H2O falls into which ARDS category?

Explanation:
The key idea is that ARDS severity is labeled by the PaO2/FiO2 ratio when a minimum PEEP of 5 cm H2O is used to assess oxygenation. According to the Berlin criteria, mild ARDS is 200–300, moderate ARDS is 100–200, and severe ARDS is ≤100. With a PaO2/FiO2 of 150, the value sits in the 100–200 range, so it is classified as moderate ARDS. The condition that PEEP is at least 5 cm H2O is required to apply these thresholds; if PEEP were lower, the classification would not be applicable.

The key idea is that ARDS severity is labeled by the PaO2/FiO2 ratio when a minimum PEEP of 5 cm H2O is used to assess oxygenation. According to the Berlin criteria, mild ARDS is 200–300, moderate ARDS is 100–200, and severe ARDS is ≤100. With a PaO2/FiO2 of 150, the value sits in the 100–200 range, so it is classified as moderate ARDS. The condition that PEEP is at least 5 cm H2O is required to apply these thresholds; if PEEP were lower, the classification would not be applicable.

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