Do lung volumes change with sleep state in the neonate?
We have studied 12 healthy full-term babies, mean age 3.2 days, using physiological criteria--EEG, electrooculogram, electromyogram, respiratory regularity and visible movement--to assess sleep state, and a respiratory jacket to record changes in functional residual capacity (FRC). A total of 593 min of sleep data were analysed. Of the recordings, 39% were scored as quiet sleep, 40% as active and 21% as indeterminate sleep. The mean maximum variation in FRC overall was 29 ml (SD +/- 15.4 ml). Examination of these figures showed that FRC variations during sleep state changes were smaller than those seen within a defined sleep state. We conclude that changes in sleep state are not associated with variations in FRC.
Stokes
G M
GM
Department of Child Health, Queen's Medical Centre, Nottingham, United Kingdom.
Milner
A D
AD
Newball
E A
EA
Smith
N J
NJ
Dunn
C
C
Wilson
A J
AJ
D005652:Functional Residual Capacity; D006801:Humans; D007231:Infant, Newborn / Q000502:physiology*; D008176:Lung Volume Measurements; D008991:Monitoring, Physiologic; D012894:Sleep Stages / Q000502:physiology*