Document Detail

Respiratory and non-respiratory thoracic movements in the fetal pig.
MedLine Citation:
PMID:  1753068     Owner:  NLM     Status:  MEDLINE    
The aim of this study was to characterize the pre-natal activity of the respiratory muscles in a non-ruminant, the pig. Tracheal pressure was recorded from 11 unanaesthetized fetal pigs in utero during late gestation in 9 sows. Two types of inspiratory effort occurred episodically in each fetus during each recording period. Episodes of breathing movements lasted 8.6 +/- 1.1 min and their overall incidence was 41.1 +/- 3.4% of recording time. The mean amplitude of the respiratory efforts was 7.6 +/- 1.1 mmHg and the mean inspiratory time was 0.8 +/- 0.1 s. Episodes of non-respiratory inspiratory efforts, considered to be fetal hiccups, lasted 5.6 +/- 0.8 min. Individual hiccups had a duration of 150-200 msec, a mean amplitude of 41.4 +/- 2.4 mmHg and a mean frequency, during episodes, of 21.9 +/- 2.0 min-1. In contrast to fetal breathing movements, hiccups appeared to be stereotyped events. It is concluded that, in common with other ruminant and non-ruminant species, two types of inspiratory effort occur in the fetal pig. Fetal hiccups, which have been observed in non-ruminant species, may be analogous to deep inspiratory efforts in the sheep fetus. The stimulus for, and function of, fetal hiccupping remain to be determined.
R Harding; A L Fowden; M Silver
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Journal of developmental physiology     Volume:  15     ISSN:  0141-9846     ISO Abbreviation:  J. Dev. Physiol.     Publication Date:  1991 May 
Date Detail:
Created Date:  1992-01-27     Completed Date:  1992-01-27     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  7910737     Medline TA:  J Dev Physiol     Country:  ENGLAND    
Other Details:
Languages:  eng     Pagination:  269-75     Citation Subset:  IM    
Physiological Laboratory, University of Cambridge, UK.
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MeSH Terms
Fetal Movement / physiology*
Hiccup / physiopathology
Respiratory Mechanics / physiology*
Respiratory Muscles / physiology

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

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