Document Detail


Myocardial systolic function increases during positive pressure lung inflation.
MedLine Citation:
PMID:  16243979     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Lung inflation with positive airway pressure may have rapid and dynamic effects on myocardial contractile function. We designed this study to assess the magnitude and time to onset of myocardial function changes during the initiation of single positive pressure lung inflation at clinically relevant inflation pressures. In 8 anesthetized 40-kg pigs, left ventricular pressures and volumes were measured directly (conductance volumetry). A 15 cm H2O airway pressure plateau with lung inflation (PPLI-15) was performed, and 2 single beats from that sequence, one from resting apnea at zero airway pressure and the second from the point when the lungs were first maximally inflated, were selected for analysis. Systolic function variables for zero airway pressure and PPLI-15 were analyzed. Systolic elastance, derived from bilinear time-varying elastance curves, increased approximately 15% during PPLI-15 from zero airway pressure. This agreed with other systolic function variables that identified an increase in left ventricular contractile function for the lung inflation beat. Serial measurements of myocardial function should be conducted with constant airway pressure and lung inflation conditions.
Authors:
Michael F Haney; Göran Johansson; Sören Häggmark; Björn Biber; Michael F Haney; Göran Johansson; Sören Häggmark; Björn Biber
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Anesthesia and analgesia     Volume:  101     ISSN:  0003-2999     ISO Abbreviation:  Anesth. Analg.     Publication Date:  2005 Nov 
Date Detail:
Created Date:  2005-10-24     Completed Date:  2005-11-22     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  1310650     Medline TA:  Anesth Analg     Country:  United States    
Other Details:
Languages:  eng     Pagination:  1269-74     Citation Subset:  AIM; IM    
Affiliation:
Anesthesiology and Intensive Care Medicine, Umeå University Hospital, 901 85 Umeå, Sweden. michael.haney@anestesi.umu.se
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MeSH Terms
Descriptor/Qualifier:
Animals
Lung / physiopathology
Positive-Pressure Respiration*
Swine
Systole*
Ventricular Function, Left

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


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