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Oxygen saturation and breathing patterns in infancy. 1: Full term infants in the second month of life
V A Stebbens1, C F Poets, J R Alexander
1Department of Paediatrics, National Heart and Lung Institute, Brompton Hospital, London.
Insights
Healthy infants often experience brief, temporary drops in arterial oxygen saturation (SaO2). Non-regular breathing patterns in infants are linked to more frequent and longer desaturation episodes.
Area of Science:
- Neonatal physiology
- Respiratory monitoring
Background:
- Pulse oximetry is crucial for assessing infant oxygenation.
- Understanding normal oxygen saturation variability and breathing patterns is essential for clinical interpretation.
Purpose of the Study:
- To characterize arterial oxygen saturation (SaO2) and abdominal wall breathing patterns in healthy infants.
- To investigate the relationship between breathing patterns and desaturation events.
Main Methods:
- Overnight 12-hour tape recordings of SaO2 and breathing movements in 67 healthy, full-term infants (29-54 days old).
- Analysis of baseline SaO2, desaturation frequency and duration, and apnoeic pauses.
- Comparison of oxygenation parameters during regular versus non-regular breathing patterns.
Main Results:
- Median baseline SaO2 was 99.8%.
- 81% of infants experienced desaturations (SaO2 ≤ 80%); median rate 0.9/hour, median duration 1.2 seconds.
- Non-regular breathing was associated with significantly higher frequency and longer duration of desaturations, and a higher percentage of apnoeic pauses followed by desaturation.
Conclusions:
- Normal variability in infant SaO2 and its relationship to breathing patterns are key for accurate pulse oximetry interpretation.
- Non-regular breathing, especially periodic breathing, increases the risk of significant desaturation events in healthy infants.
Abstract:
Overnight 12 hour tape recordings were made of arterial oxygen saturation (SaO2, pulse oximeter in the beat to beat mode) and abdominal wall breathing movement on 67 healthy, full term infants between the ages of 29 and 54 (median 39) days. The median baseline SaO2 during regular breathing was 99.8% (range 97.0-100%). Fifty four infants (81%) had shortlived episodes during which SaO2 fell to 80% or less (desaturation); the median rate was 0.9 desaturations/hour, and the median duration of each desaturation was 1.2 seconds. The 97th centile value for the duration of all episodes in which SaO2 fell to less than or equal to 80% was 4.0 seconds. The frequency of desaturations was significantly higher, and their duration significantly longer, when the breathing pattern was non-regular rather than regular. The percentage of apnoeic pauses (greater than or equal to 4 seconds in duration) followed by a desaturation was higher during non-regular than regular breathing; it was particularly high during periodic breathing. A knowledge of normal variability of baseline measurements of oxygenation and of the relationship between oxygenation and breathing patterns in infants is essential to the use of pulse oximetry in clinical practice.