These tools will no longer be maintained as of December 31, 2024. Archived website can be found here. PubMed4Hh GitHub repository can be found here. Contact NLM Customer Service if you have questions.
Pubmed for Handhelds
PUBMED FOR HANDHELDS
Search MEDLINE/PubMed
Title: Phase characteristics of breathing movements in healthy newborns. Author: Andersson D, Gennser G, Johnson P. Journal: J Dev Physiol; 1983 Oct; 5(5):289-98. PubMed ID: 6227654. Abstract: In the neonatal period, respiratory distortion of the chest wall in active sleep has been reported to reduce the thoracic gas volume. In order to investigate whether the distortion influences the tidal volume, a thorough quantification of the phase differences between the movements of the chest wall and the abdominal wall and the relation of the phase differences to the ventilation was performed on fifteen newborn infants sleeping in prone position. The changes in the circumference of the chest and abdomen were measured with mercury-in-silastic strain gauges; nasal air flow was monitored with a pneumotachograph. During quiet sleep, the movements of the chest wall and the abdominal wall were congruent and regular, and the tidal volume was not dependent on the observed phase differences between them. In active sleep, the breathing movements were incongruent, the tidal volume was negatively correlated with the phase shift between the movements of the chest wall and the abdominal wall, and the mean inspiratory flow was increased. Ventilation (ml/min) did not differ between the sleep states. This study thus suggests that, in healthy newborns in active sleep, the chest wall distortion leads to a reduction of the tidal volume, but ventilation is upheld by compensatory mechanisms, i.e. increased breathing rate and increased amplitude of movements of the diaphragm.[Abstract] [Full Text] [Related] [New Search]