Automated control of inspired oxygen in ventilated preterm infants: crossover physiological study

Area of Science:

• Neonatalogy
• Respiratory Medicine
• Biomedical Engineering

Background:

• Maintaining optimal oxygen saturation is critical for preterm infants on mechanical ventilation.
• Manual control of fraction of inspired oxygen (FiO2) can lead to fluctuations in oxygen saturation (SpO2).

Purpose of the Study:

• To compare the efficacy of automated FiO2 control versus manual control in maintaining target SpO2 range in preterm infants.
• To assess the impact of automated control on reducing extreme hypoxemia and hyperoxemia.

Main Methods:

• A crossover physiological study was conducted on preterm infants requiring mechanical ventilation and supplemental oxygen.
• Infants were monitored for two 12-hour periods under random sequences of automated and manual FiO2 control.
• Key outcomes included time within, below, and above the target SpO2 range (90-95%), and instances of severe hypoxemia (<80%) and hyperoxemia (≥98%).

Main Results:

• Automated control resulted in a significantly higher percentage of time within the target SpO2 range (72.8% vs 59.6%, p=0.031).
• Automated control significantly reduced time spent below (18.1% vs 25.9%, p=0.028) and above the target range (4.8% vs 10.1%, p=0.026).
• Severe hypoxemia (SpO2 <80%) and hyperoxemia (SpO2 ≥98%) were significantly reduced with automated control (p=0.022 and p=0.001, respectively).

Conclusions:

• Automated FiO2 control significantly enhances oxygen saturation targeting compliance in mechanically ventilated preterm infants.
• This technology effectively minimizes exposure to both hypoxemic and hyperoxemic conditions.
• Automated control offers a more stable and safer approach to oxygen management in this vulnerable population.