Lung Ultrasound Evaluation of the Impact of Inspired Oxygen Fraction on Atelectasis During Induction of General Anesthesia in Pediatric Patients: A Randomized Controlled Trial.
Yin-Qi Tian, Wei Wei, Yu-Qiong Liu et al.
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In 30 seconds
This prospective randomized controlled trial compared 100% with 50% inspired oxygen during induction of general anesthesia in 114 children aged 1–7 years with ASA physical status I–II. Lung ultrasound was used to assess atelectasis at six time points. At the peak, 10 minutes after mechanical ventilation began, clinically significant atelectasis occurred in 67% of the 100% oxygen group and 33% of the 50% group (P < 0.001), a 51% relative risk reduction. The 50% oxygen strategy was also associated with lower atelectasis severity, and neither group had hypoxemic events.
Key findings
- At 10 minutes of mechanical ventilation, atelectasis incidence was 67% with 100% FiO₂ versus 33% with 50% FiO₂ (P < 0.001).
- The highest global lung ultrasound score was 12.4 ± 3.1 with 100% FiO₂ versus 8.2 ± 2.6 with 50% FiO₂ (P < 0.001).
- Atelectasis in gravity-dependent lung regions was more pronounced with 100% FiO₂ (P < 0.05).
- No hypoxemic events were observed in either group.
Why it matters
Atelectasis can develop early during pediatric anesthesia, and this trial found less frequent and less severe ultrasound-assessed atelectasis with 50% rather than 100% inspired oxygen during induction. The absence of observed hypoxemic events in either group is reassuring within the studied population, while the findings highlight a potential balance between oxygen administration and pulmonary effects.
What to keep in mind
The study included children aged 1–7 years with ASA physical status I–II; the abstract does not report longer-term pulmonary outcomes.