Document Detail

The fetal breath cycle.
MedLine Citation:
PMID:  2178919     Owner:  NLM     Status:  MEDLINE    
Fetal breathing movements may be timed precisely from the umbilical vein flow velocity profile recorded using Doppler ultrasound. Serial studies were performed on eight normal fetuses from 28 weeks pregnancy until delivery. Measurements were made of the inspiratory time, total breath time and breath amplitude. There was a clear change in the pattern of fetal breathing with advancing gestation. The inspiratory time lengthened and the amplitude of each breath increased. The variability of these measures decreased. The timing equation ti/ttotal lengthened. The area of change in the umbilical vein sonogram was calculated as a measure of respiratory work and this increased with gestation. It is suggested that the changing pattern of fetal breathing movements reflects changes in central control of breathing in the fetus and parallels observations in the newborn.
B J Trudinger; C M Cook
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Early human development     Volume:  21     ISSN:  0378-3782     ISO Abbreviation:  Early Hum. Dev.     Publication Date:  1990 Mar 
Date Detail:
Created Date:  1990-04-25     Completed Date:  1990-04-25     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  7708381     Medline TA:  Early Hum Dev     Country:  NETHERLANDS    
Other Details:
Languages:  eng     Pagination:  181-91     Citation Subset:  IM    
Fetal Welfare Laboratory, University of Sydney, Westmead Hospital, N.S.W., Australia.
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MeSH Terms
Embryonic and Fetal Development / physiology*
Fetal Movement / physiology*
Regional Blood Flow
Respiratory Mechanics / physiology*
Umbilical Veins / physiology

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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