Document Detail

Gas diffusion in the middle ear.
MedLine Citation:
PMID:  1906219     Owner:  NLM     Status:  MEDLINE    
The ex vacuo theory, claiming that in cases of middle ear underaeration air enters the middle ear through the Eustachian tube in diminished amounts while oxygen continues to leave it into the blood by diffusion as in normal condition, does not provide a complete explanation for the aeration problems encountered in middle ear pathology. This study shows that when atelectatic ears are politzerized (hyperinflated) with different gases, these gases disappear with a speed that correspond to the diffusion coefficient of the different gases. This finding together with the fact that the composition of middle ear gases is very similar to that found in the venous circulation suggests that it is a diffusional process of several gases from the middle ear into the blood and in the opposite direction that mainly determines the middle ear pressure.
J Sadé; M Luntz
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Acta oto-laryngologica     Volume:  111     ISSN:  0001-6489     ISO Abbreviation:  Acta Otolaryngol.     Publication Date:  1991  
Date Detail:
Created Date:  1991-08-13     Completed Date:  1991-08-13     Revised Date:  2004-11-17    
Medline Journal Info:
Nlm Unique ID:  0370354     Medline TA:  Acta Otolaryngol     Country:  SWEDEN    
Other Details:
Languages:  eng     Pagination:  354-7     Citation Subset:  IM    
Department of Otolaryngology, Sackler School of Medicine, Tel-Aviv University, Ramat Aviv, Israel.
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MeSH Terms
Carbon Dioxide / blood
Ear Diseases / physiopathology*
Ear, Middle / physiopathology*
Eustachian Tube / physiopathology*
Middle Aged
Mucous Membrane / physiopathology
Nitrogen / blood
Oxygen / blood
Partial Pressure
Tympanic Membrane / physiopathology
Reg. No./Substance:
0/Gases; 124-38-9/Carbon Dioxide; 7727-37-9/Nitrogen; 7782-44-7/Oxygen

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

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