Document Detail


Lung compliance and its transient elevations measured with pulse-flow method.
MedLine Citation:
PMID:  7263395     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
We describe a pulse-flow method of measuring static lung compliance (CL) that is sensitive to rapid transients in CL. CL is measured by blowing air at a constant flow into the mouth and lungs for 2 s and calculated by dividing airflow in 1/s by the change in transpulmonary pressure in CMH2O/s. Pulse and static inspiratory CL was measured in five normals, four obstructives, five obese, and two patients with pulmonary fibrosis, Pulse CL after tidal breathing was correlated with static CL measured after deep breaths (r = 0.96). Pulse CL after deep breaths was higher than pulse CL after tidal breathing (p less than 0.01) and then static CL after deep breaths (p less than 0.05). In all subjects the lower the forced expiratory volume in 1 s, expressed as a percentage of vital capacity (FEV1/FVC), the greater the increase in pulse CL after a deep breath will be (r = 0.93). After deep breaths pulse CL fell from maximum CL to base-line CL at a rate related to 1/t2 where t equals the time in seconds from the last deep breath. We conclude that the increase in CL after a deep breath is related to the degree of airway obstruction and that the subsequent fall in CL is related to 1/t2.
Authors:
P M Suratt; D H Owens; H Hsiao; D L Kaiser; D F Rochester
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Journal of applied physiology: respiratory, environmental and exercise physiology     Volume:  50     ISSN:  0161-7567     ISO Abbreviation:  J Appl Physiol Respir Environ Exerc Physiol     Publication Date:  1981 Jun 
Date Detail:
Created Date:  1981-10-25     Completed Date:  1981-10-25     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:  1318-24     Citation Subset:  IM    
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MeSH Terms
Descriptor/Qualifier:
Adult
Female
Humans
Lung Compliance*
Lung Diseases, Obstructive / physiopathology*
Male
Mathematics
Middle Aged
Obesity / physiopathology
Respiratory Function Tests / instrumentation,  methods*

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


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