What SpO2 and FiO2 thresholds are commonly used to guide mobilization decisions?

• A. SpO2 ≥ 92% on FiO2 ≤ 0.6 and PEEP ≤ ~10 cm H2O
• B. SpO2 ≥ 94% on FiO2 ≤ 0.5 and PEEP ≤ 12 cm H2O
• C. SpO2 ≥ 90% on FiO2 ≤ 0.4 and PEEP ≤ 5 cm H2O
• D. SpO2 ≥ 95% on FiO2 ≤ 0.8 and PEEP ≤ ~10 cm H2O

Answer: (A)

Mobilization safety hinges on keeping oxygenation stable during activity and avoiding high ventilator support unless necessary. The best guideline is to ensure the patient is saturating adequately (SpO2 around or above 92%), while the amount of supplemental oxygen and airway pressure support is kept moderate (FiO2 not exceeding about 0.6 and PEEP around 10 cm H2O or less). This combination indicates the patient has enough oxygen reserve to tolerate movement without desaturating, and their lung mechanics aren’t so severely impaired that mobilization would pose undue risk.

The option with SpO2 ≥ 92% on FiO2 ≤ 0.6 and PEEP ≤ ~10 cm H2O fits this balance: SpO2 is above the commonly accepted safety threshold, FiO2 is moderate, and PEEP is not excessively high, suggesting stability during activity.

Other choices align less well with typical mobilization safety criteria. Some impose a stricter SpO2 target or a lower FiO2, which can be overly conservative and not reflect a patient’s actual stability. Some permit a high FiO2 (like 0.8), which often indicates significant respiratory support and increased risk during movement, making mobilization less appropriate.