Document Detail

Comparative pulmonary mechanics in the horse and the cow.
MedLine Citation:
PMID:  2740626     Owner:  NLM     Status:  MEDLINE    
Pulmonary mechanics and lung volumes were measured in horses and cows to determine if differences in breathing pattern between the two species were due to differences in the mechanical properties of the lungs. Tidal volume (VT) was larger in the horses, while the respiratory rate (fR) and minute ventilation (VE) were higher in the cows. The horses often had a double peak in airflow during inspiration and, or, expiration, while the cows had a single peak during expiration. Measured lung volumes were larger in the horses and they had a higher dynamic lung compliance (Cdyn,L), although the static compliance of the lung, chest wall and respiratory system (Cst,L,Cst,w and Cst,rs respectively) did not appear to differ between the two species. The cows had a greater change in maximum transpulmonary pressure (delta PLmax) and an increased nonelastic work of breathing (Wb). However, the pulmonary resistance (RL) did not differ between the two species, thus the higher delta PLmax and Wb in the cows were most likely a function of their higher flow rates. Calculations of the rate of work of breathing (W) indicate that both species breathed at an fR above the minimum W. The fR in the horses was close to the fR predicted for the average minimum muscle force, but the fR in the cows was higher. As the differences in the mechanical properties of the lung do not explain the differences in flow pattern, nor adequately account for the higher fR in the cows, it is suggested that the differences in breathing pattern between the two species is due to differences in the chest wall, particularly the size and shape of the abdomen.
G J Gallivan; W N McDonell; J B Forrest
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Publication Detail:
Type:  Comparative Study; Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Research in veterinary science     Volume:  46     ISSN:  0034-5288     ISO Abbreviation:  Res. Vet. Sci.     Publication Date:  1989 May 
Date Detail:
Created Date:  1989-08-09     Completed Date:  1989-08-09     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0401300     Medline TA:  Res Vet Sci     Country:  ENGLAND    
Other Details:
Languages:  eng     Pagination:  322-30     Citation Subset:  IM    
Department of Anaesthesia, McMaster University Medical Center, Hamilton, Ontario, Canada.
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MeSH Terms
Cattle / physiology*
Horses / physiology*
Lung Volume Measurements / veterinary
Species Specificity

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

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