Oxygen-Saturation Targets for Critically Ill Adults Receiving Mechanical Ventilation

Area of Science:

• Critical Care Medicine
• Pulmonology
• Clinical Trials

Background:

• Invasive mechanical ventilation requires precise oxygen (inspired oxygen fraction) management to maintain arterial oxygen saturation.
• Optimal oxygen-saturation targets for critically ill adults on mechanical ventilation are not well-established.
• Pulse oximetry (SpO2) is a key monitoring tool in this patient population.

Purpose of the Study:

• To investigate the impact of different oxygen saturation targets on clinical outcomes in critically ill adults receiving mechanical ventilation.
• To determine if lower, intermediate, or higher SpO2 targets influence ventilator-free days or mortality.
• To provide evidence-based guidance on oxygen titration strategies in intensive care settings.

Main Methods:

• A pragmatic, cluster-randomized, cluster-crossover trial was conducted in an academic medical center's emergency department and medical intensive care unit.
• Adults on mechanical ventilation were assigned to one of three SpO2 target groups: lower (90%), intermediate (94%), or higher (98%).
• The primary outcome was ventilator-free days within 28 days; a key secondary outcome was 28-day mortality.

Main Results:

• No significant difference in median ventilator-free days was observed among the lower (20 days), intermediate (21 days), and higher (21 days) SpO2 target groups (P=0.81).
• 28-day in-hospital mortality rates were comparable across groups: 34.8% (lower), 34.0% (intermediate), and 33.2% (higher).
• Incidences of adverse events like cardiac arrest, myocardial infarction, stroke, and pneumothorax were similar across all SpO2 target groups.

Conclusions:

• Targeting lower, intermediate, or higher oxygen saturation levels in critically ill adults on mechanical ventilation does not affect the number of ventilator-free days.
• The study found no significant differences in mortality or major adverse events among the tested SpO2 targets.
• These findings suggest that current oxygen titration strategies may not need adjustment based solely on SpO2 targets in this patient group.