Document Detail


Alveolar function following surfactant deactivation.
MedLine Citation:
PMID:  6895368     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
In vivo cinemicroscopic studies of subpleural alveoli were conducted in dogs for 4 h after pulmonary lavage with 5% Tween 20 and after lavage with normal saline. Saline-lavaged alveoli showed little change in alveolar size during tidal ventilation, whereas Tween lavage resulted both in alveolar recruitment and marked variation in alveolar size from end expiration to peak inspiration, with total collapse frequently occurring by end expiration. Following Tween, alveolar stability decreased, but alveolar capillary perfusion increased. Marked recovery of stability by 4 h was noted in most alveoli. Wilhelmy balance studies on lung extracts showed a decrease in surfactant function 30 min after Tween and a partial recovery of surfactant activity after 4 h. This study provides in vivo evidence that normal surfactant function is critical to alveolar stability and that alveolar stability is markedly restored 4 h after acute deactivation or displacement by Tween. Surfactant deactivation and loss of alveolar stability are associated with increased alveolar capillary perfusion creating significant ventilation-perfusion ratio abnormalities.
Authors:
G F Nieman; C E Bredenberg; W R Clark; N R West
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Journal of applied physiology: respiratory, environmental and exercise physiology     Volume:  51     ISSN:  0161-7567     ISO Abbreviation:  J Appl Physiol Respir Environ Exerc Physiol     Publication Date:  1981 Oct 
Date Detail:
Created Date:  1982-01-20     Completed Date:  1982-01-20     Revised Date:  2013-09-26    
Medline Journal Info:
Nlm Unique ID:  7801242     Medline TA:  J Appl Physiol Respir Environ Exerc Physiol     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  895-904     Citation Subset:  IM    
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MeSH Terms
Descriptor/Qualifier:
Animals
Dogs
Microscopy
Microscopy, Electron, Scanning
Motion Pictures as Topic
Polysorbates / administration & dosage,  pharmacology
Pulmonary Alveoli / physiology*,  ultrastructure
Pulmonary Surfactants / physiology*
Therapeutic Irrigation
Time Factors
Chemical
Reg. No./Substance:
0/Polysorbates; 0/Pulmonary Surfactants

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


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