Document Detail

Human rib cage distortability.
MedLine Citation:
PMID:  8828696     Owner:  NLM     Status:  MEDLINE    
In five normal men, we divided the rib cage into lung-apposed [pulmonary rib cage (RCp)] and diaphragm-apposed [abdominal rib cage (RCab)] compartments and calculated their absolute cross-sectional areas (Arc,p and Arc,ab) by anteroposterior and lateral dimensions measured by magnetometry. Distortion was quantified as the displacement of RCp and RCab produced by diaphragmatic twitches away from the relaxed configuration. We measured transdiaphragmatic pressure as the difference between gastric and esophageal pressures. Distortability was expressed as percent distortion per transdiaphragmatic pressure and varied among individuals from 0.02 to 0.23%/cmH2O. The pressure acting to restore the distorted rib cage back to its relaxed shape (Plink) varied from 0.1 to 31.3 cmH2O/%distortion. Distortion correlated positively (r = 0.92) and Plink per percent distortion negatively (r = -0.90) with RCab compliance during the relaxation maneuver (delta Arc, ab/delta gastric pressure). We conclude that rib cage distortability varies widely among normal subjects and is closely linked to RCab compliance.
K Chihara; C M Kenyon; P T Macklem
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Publication Detail:
Type:  Clinical Trial; Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Journal of applied physiology (Bethesda, Md. : 1985)     Volume:  81     ISSN:  8750-7587     ISO Abbreviation:  J. Appl. Physiol.     Publication Date:  1996 Jul 
Date Detail:
Created Date:  1996-12-18     Completed Date:  1996-12-18     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:  437-47     Citation Subset:  IM    
Meakins-Christie Laboratories, McGill University Clinic, Royal Victoria Hospital, Montreal, Quebec, Canada.
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MeSH Terms
Abdomen / anatomy & histology,  physiology
Diaphragm / anatomy & histology,  physiology
Electric Stimulation
Esophagus / physiology
Lung / anatomy & histology,  physiology
Phrenic Nerve / physiology
Pleura / anatomy & histology,  physiology
Ribs / anatomy & histology,  physiology*
Stomach / physiology

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

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