What might indicate that a ventilated patient is experiencing inadequate oxygenation?

Low PaO2 readings are a clear indicator that a patient is experiencing inadequate oxygenation. Inadequate oxygenation occurs when the arterial oxygen levels in the blood are below the normal range, typically indicated by a partial pressure of arterial oxygen (PaO2) value. Normal PaO2 values range from approximately 75 to 100 mmHg; thus, readings lower than this suggest insufficient oxygen is reaching the blood, which can lead to tissue hypoxia and potential organ dysfunction.

When evaluating ventilated patients, monitoring PaO2 is crucial in assessing whether ventilation is providing adequate oxygenation. If the PaO2 is low, even if the ventilatory parameters appear normal (such as tidal volume, respiratory rate, and stable vital signs), it signals a need for further investigation and possible intervention, such as adjusting ventilator settings or supplemental oxygen administration.