Document Detail

Compliance of the main pulmonary artery during the ventilatory cycle.
MedLine Citation:
PMID:  1559929     Owner:  NLM     Status:  MEDLINE    
Transmural pulmonary arterial pressure (Ppa), diameter (D), and length (L) of a segment of the main pulmonary artery (MPA) were measured simultaneously in anesthetized open-chest dogs. The instantaneous volume was calculated from D and L. Pulmonary arterial elasticity for diameter (EpD) was calculated as the ratio of the amplitude of Ppa to D oscillation normalized by the mean D. Similar indexes were calculated for L (EpL) and V (Epv). Compliance per unit length was calculated from the dimensions and elasticity of the MPA. Under control conditions with 5 cmH2O positive end-expiratory pressure, EpD, EpL, and Epv at cardiac frequency were 175 +/- 27, 147 +/- 27, and 55 +/- 7 cmH2O, respectively. EpD increased with positive end-expiratory pressure, but EpL decreased and Epv was unaffected. EpD, EpL, Epv, and compliance per unit length were not significantly different between the start of inspiration and the start of expiration. In addition, there were no significant phase differences between the oscillations of Ppa and V at respiratory frequency. We conclude that the previously reported time variation of pulmonary arterial compliance during the ventilatory cycle is not due to time-varying properties of the MPA.
B J Grant; B B Lieber
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Publication Detail:
Type:  Journal Article; Research Support, U.S. Gov't, P.H.S.    
Journal Detail:
Title:  Journal of applied physiology (Bethesda, Md. : 1985)     Volume:  72     ISSN:  8750-7587     ISO Abbreviation:  J. Appl. Physiol.     Publication Date:  1992 Feb 
Date Detail:
Created Date:  1992-05-13     Completed Date:  1992-05-13     Revised Date:  2013-09-26    
Medline Journal Info:
Nlm Unique ID:  8502536     Medline TA:  J Appl Physiol (1985)     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  535-42     Citation Subset:  IM    
Department of Medicine, State University of New York, Buffalo 14215.
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MeSH Terms
Blood Pressure / physiology
Myocardial Contraction / physiology
Positive-Pressure Respiration
Pulmonary Artery / physiology*
Respiratory Mechanics / physiology*
Vascular Resistance / physiology
Grant Support
Erratum In:
J Appl Physiol 1992 Sep;73(3):followi

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

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