Polysomnography Reference Values in Healthy Newborns.
Level 4 - case-series / case-control
Cross-sectional normative observational study in a single cohort of healthy term newborns.
PubMed 30853051 · doi:10.5664/jcsm.7670
What was done
A cross-sectional study established normative polysomnography (PSG) values in 30 healthy, full-term newborn infants (gestational age 37 to 42 weeks) evaluated before 30 days of life (mean age 19.6 days). Sleep studies were conducted and scored using standardized American Academy of Sleep Medicine interpretation criteria.
What was found
Mean sleep efficiency was 71%, with sleep architecture comprising 16.1% transitional, 43.3% NREM, and 40.6% REM sleep. The mean arousal index was 14.7 events/h (respiratory arousal index 1.2 events/h). The mean apnea-hypopnea index (AHI) was 14.9 events/h, broken down into central (5.4 events/h), obstructive (2.3 events/h), and mixed (1.2 events/h) apnea indices. Mean oxygen saturation during sleep was 97.9% with a nadir of 84.4%. Mean end-tidal CO2 was 35.4 mmHg, with infants spending an average of 6.2% of sleep time with end-tidal CO2 above 45 mmHg and 0.6% above 50 mmHg.
Why it matters
Standard diagnostic thresholds and severity classifications for pediatric sleep apnea are calibrated for older infants and children; applying them to newborns risks significant overdiagnosis, as healthy neonates naturally demonstrate higher baseline respiratory event rates and lower sleep efficiency.
Limits
The sample size was small (n = 30), limiting the ability to establish definitive reference percentiles or evaluate subgroup differences. The abstract does not report longitudinal follow-up, daytime versus overnight recording context, or intra-individual variability across multiple nights.
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