Document Detail


Changes in regional emptying sequence need not change maximum expiratory flow.
MedLine Citation:
PMID:  3722051     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Nine normal young men inhaled boluses of He at the onset of slow vital capacity (VC) inspirations. During the subsequent VC expirations, we measured expired flow, volume, and He concentrations. Expirations consisted of full or partial maximum expiratory flow-volume (MEFV) maneuvers. Full maneuvers were forced expirations from total lung capacity (TLC). Partial maneuvers were accomplished by expiring slowly from TLC to 70, 60, 50, and 40% VC and then initiating forced expiration. Expired He concentrations from full and partial maneuvers were compared with each other and with those resulting from slow expirations. At comparable volumes less than 50% VC, flow during partial and full MEFV maneuvers did not differ. Expired He concentrations were higher during partial maneuvers than during full ones; at the onset of partial maneuvers upper zone emptying predominated, whereas this was not the case at the same lung volumes during maneuvers initiated at TLC. We observed substantial differences in regional emptying sequence that did not influence maximum expiratory flow.
Authors:
R B Filuk; N R Anthonisen
Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Journal of applied physiology (Bethesda, Md. : 1985)     Volume:  60     ISSN:  8750-7587     ISO Abbreviation:  J. Appl. Physiol.     Publication Date:  1986 Jun 
Date Detail:
Created Date:  1986-08-18     Completed Date:  1986-08-18     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:  1834-8     Citation Subset:  IM    
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MeSH Terms
Descriptor/Qualifier:
Adult
Forced Expiratory Flow Rates*
Helium / diagnostic use
Humans
Male
Maximal Expiratory Flow Rate*
Maximal Expiratory Flow-Volume Curves
Respiration*
Vital Capacity
Chemical
Reg. No./Substance:
7440-59-7/Helium

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


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