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Extended Continuous Positive Airway Pressure in Infants Born Preterm Decreases Intermittent Hypoxemia: A Secondary
Rachna R Mamidi1, Mitzi Donabel A Go2, Julia Harris2
1Department of Pediatrics, Oregon Health & Science University, Portland, OR; Department of Pediatrics, University of Missouri, Columbia, MO.
Insights
Extended CPAP (eCPAP) significantly reduced intermittent hypoxemia (IH) episodes and duration in preterm infants. This simple strategy improved oxygenation, supporting lung and brain development.
Area of Science:
- Neonatal Medicine
- Respiratory Physiology
- Pediatric Critical Care
Background:
- Preterm infants often experience intermittent hypoxemia (IH), impacting development.
- Continuous Positive Airway Pressure (CPAP) is a common respiratory support, but its optimal duration is debated.
- Assessing the benefits of extended CPAP (eCPAP) versus discontinuation (dCPAP) is crucial for stable preterm infants.
Purpose of the Study:
- To evaluate the effect of eCPAP versus dCPAP on IH episodes, duration, and oxygen saturation (SpO2) in stable preterm infants.
- To determine if eCPAP can mitigate IH during a critical developmental window.
Main Methods:
- Secondary analysis of a randomized trial involving infants ≤32 weeks' gestation.
- Infants meeting stability criteria received either 14 days of eCPAP or dCPAP.
- Continuous pulse oximetry monitored SpO2 with high-resolution data collection.
Main Results:
- Infants receiving eCPAP had significantly fewer IH episodes (57.6 vs 151.7 per 24 hours) and shorter cumulative IH duration.
- eCPAP was associated with higher mean SpO2 without supplemental oxygen.
- Increased functional residual capacity was observed in the eCPAP group, correlating inversely with IH burden.
Conclusions:
- Extending CPAP therapy in stable preterm infants breathing room air reduces IH frequency and duration.
- eCPAP is an effective, non-pharmacologic method to improve oxygenation and support development in preterm infants.
- eCPAP mitigates IH, a critical factor during early lung and brain development.
Objective:
To assess the impact of extended continuous positive airway pressure (eCPAP) vs discontinued continuous positive airway pressure (dCPAP) on intermittent hypoxemia (IH) episodes, IH duration, and mean pulse oximeter oxygen saturation (SpO2) in stable infants born preterm.
Study Design:
Prespecified secondary analysis of a single-center randomized trial. Infants ≤32 weeks' gestation who required ≥24 hours of continuous positive airway pressure and met predefined respiratory stability criteria on room air at <35 weeks postmenstrual age were randomized to 14 days of eCPAP or dCPAP. Continuous pulse oximetry was obtained using a high-resolution research oximeter (2-second sampling rate). Analyses were by intention to treat.
Results:
Ninety-five of 100 randomized infants were included (50 eCPAP, 45 dCPAP). Infants randomized to eCPAP experienced significantly fewer IH episodes (SpO2 <90% lasting 10-300 seconds) compared with dCPAP (mean 57.6 [SE 23.1] vs 151.7 [23.6]) for Mdiff of -94.1(19.2) episodes per 24 hours, 95% CI [-132.2, -55.9], P < .0001). eCPAP was associated with a higher mean SpO2 despite no supplemental oxygen use, fewer IH episodes across all thresholds and durations, and shorter cumulative IH duration. Functional residual capacity at the end of treatment was significantly higher in the eCPAP group and inversely correlated with IH burden (r = -0.32, P = .0016). Mediation analysis demonstrated that 66.3% of the treatment effect of eCPAP on IH reduction was mediated through increased SpO2.
Conclusions:
In stable preterm infants breathing room air, extending continuous positive airway pressure therapy significantly reduces the frequency and duration of IH and increases mean oxygenation. eCPAP is a simple, nonpharmacologic strategy to mitigate IH during a critical period of lung and brain development.
Trial Registration:
ClinicalTrials.gov NCT04295564.
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