Optimal oxygen saturations in preterm infants: a moving target
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Published on: August 19, 2020
1NHMRC Clinical Trials Centre, University of Sydney, Sydney, New South Wales, Australia. lisa.askie@ctc.usyd.edu.au
Insights
Current evidence suggests targeting lower oxygen saturation levels in preterm infants may increase early mortality. Until optimal ranges are defined, maintaining oxygen saturation above 90% is advisable for premature babies.
Area of Science:
- Neonatal Medicine
- Pediatric Pulmonology
- Neonatal Intensive Care
Background:
- Optimal oxygen saturation targets for preterm infants remain uncertain.
- Existing evidence is limited, with few randomized trials.
- Higher oxygen saturation may increase risks of retinopathy and pulmonary issues.
Purpose of the Study:
- To address the ongoing uncertainty regarding optimal oxygen saturation targets in preterm infants.
- To review current evidence and identify gaps in knowledge.
- To inform clinical practice and future research directions.
Main Methods:
- Systematic review of existing evidence.
- Analysis of interim results from four independent randomized trials.
- Establishment of a collaborative group investigating five randomized trials.
Main Results:
- Higher oxygen saturation levels are associated with increased risk of severe retinopathy of prematurity and pulmonary morbidities.
- Interim results from four trials indicate increased early mortality when targeting lower oxygen saturation ranges.
- Data on long-term neurodevelopmental outcomes and effects of various target ranges are lacking.
Conclusions:
- Defining and maintaining optimal oxygen saturation levels in preterm infants is a clinical challenge.
- Ongoing collaborative research efforts are expected to provide further guidance.
- Current evidence suggests avoiding oxygen saturation targets below 90%.
Purpose Of Review:
New evidence is emerging to address the continued uncertainty regarding the optimal range to target oxygen saturation levels in preterm infants.
Recent Findings:
A recently published systematic review summarized the existing evidence for currently used oxygen saturation targets in preterm infants and highlighted the paucity of randomized trials addressing this topic. It appears that higher oxygen saturation levels increase the risk of severe retinopathy of prematurity and pulmonary morbidities. However, data regarding the effects of various target ranges on early mortality and long-term neurodevelopmental outcomes are lacking. A collaborative group of investigators from five independent randomized trials was established to answer this question definitively. Although the final analysis will not be available until 2014, interim results from four of these trials revealed an increase in early mortality when the lower oxygen saturation range is targeted. At present, it may be prudent not to target oxygen saturation levels below 90%. Whatever the optimal range, consistently maintaining the newborn's oxygen saturation levels within target proves an additional challenge for providers. Both technological advancements and optimized patient--caregiver ratios may be useful in achieving targeted oxygen saturation goals.
Summary:
Defining and maintaining optimal oxygen saturations in preterm infants remains a challenge for clinicians caring for preterm infants. However, ongoing investigative collaborations may soon provide guidance.
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