Oxygen management in mechanically ventilated patients: A multicenter prospective observational study

Area of Science:

• Critical Care Medicine
• Respiratory Physiology
• Mechanical Ventilation

Background:

• Mechanical ventilation (MV) is a life-support treatment for respiratory failure.
• Optimizing oxygenation is crucial during MV to prevent hypoxemia and minimize oxygen toxicity.
• Understanding the relationship between fraction of inspired oxygen (F_IO₂) and arterial oxygen levels is essential for patient management.

Purpose of the Study:

• To observe arterial oxygen levels in relation to fraction of inspired oxygen (F_IO₂) in adult patients requiring mechanical ventilation (MV).
• To assess the frequency and management of hyperoxemia during MV.

Main Methods:

• A multicenter prospective observational study involving 454 adult patients requiring MV for over 48 hours.
• Collected data on F_IO₂, PaO₂, and SaO₂ from MV initiation up to day 7 in the ICU.
• Analyzed oxygenation parameters in relation to ventilator settings and patient outcomes.

Main Results:

• Patients frequently experienced hyperoxemia (PaO₂ ≥100mmHg) during MV, with PaO₂ ≥130mmHg occurring in 18.4% of the study period.
• After day two, most patients received F_IO₂ between 0.3 and 0.49, maintaining median PaO₂ around 90mmHg.
• F_IO₂ was less likely to be decreased when it was below 0.5, even with high PaO₂ or SaO₂, suggesting a failure to correct hyperoxemia.

Conclusions:

• Hyperoxemia is a common finding in patients receiving mechanical ventilation.
• Current practices may not adequately correct hyperoxemia, even when oxygen saturation is high.
• Further research is needed to optimize F_IO₂ management during MV to prevent potential adverse effects of prolonged hyperoxemia.