Document Detail

Assessment of asynchronous and paradoxic motion between rib cage and abdomen in normal subjects and in patients with chronic obstructive pulmonary disease.
MedLine Citation:
PMID:  6486558     Owner:  NLM     Status:  MEDLINE    
Both scalar tracings and XY plots of rib cage (RC) and abdominal (AB) excursions were analyzed to detect asynchronous and/or paradoxic motion of one compartment with respect to the other in an effort to distinguish differences between normal subjects and patients with chronic obstructive pulmonary disease (COPD). An inspiratory asynchrony index (IAI) was obtained by connecting a straight line from beginning inspiration to end inspiration of the RC-AB loop, and dividing the area enclosed by the inspiratory portion by the tidal volume. In like manner, an expiratory asynchrony index (EAI) was computed. Values of IAI and EAI in the supine posture were greater in patients with COPD than in normal subjects, and such differences were consistently demonstrated during natural and voluntarily controlled abdominal breathing. Paradoxic motion as percent of volume or time period of inspiratory and expiratory compartmental excursions was indicated when RC or AB compartments moved in an opposite direction to the sum of the two. During natural breathing, paradoxic motion was almost absent in normal subjects and variably present in patients with COPD. Voluntarily controlled breathing patterns produced increased IAI, EAI, and paradoxic motion. Passive tilting from supine to the upright posture did not affect indexes in normal subjects but reduced asynchronous and paradoxic motion of the RC in patients with COPD. Other indexes of loop analysis, such as phase angle and maximal compartment amplitude/tidal volume, were not as consistent in distinguishing between normal subjects and patients with COPD during natural and voluntarily controlled breathing patterns.(ABSTRACT TRUNCATED AT 250 WORDS)
M A Sackner; H Gonzalez; M Rodriguez; A Belsito; D R Sackner; S Grenvik
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Publication Detail:
Type:  Comparative Study; Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, P.H.S.    
Journal Detail:
Title:  The American review of respiratory disease     Volume:  130     ISSN:  0003-0805     ISO Abbreviation:  Am. Rev. Respir. Dis.     Publication Date:  1984 Oct 
Date Detail:
Created Date:  1984-11-19     Completed Date:  1984-11-19     Revised Date:  2007-11-14    
Medline Journal Info:
Nlm Unique ID:  0370523     Medline TA:  Am Rev Respir Dis     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  588-93     Citation Subset:  AIM; IM    
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MeSH Terms
Abdomen / physiopathology*
Lung Diseases, Obstructive / physiopathology*
Middle Aged
Ribs / physiopathology*
Tidal Volume
Time Factors
Grant Support

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

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