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Relationship between the gas composition of the middle ear and the venous blood at steady state
Author(s) -
Luntz M.,
Levi D.,
Sadé J.,
Herman M.
Publication year - 1995
Publication title -
the laryngoscope
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.181
H-Index - 148
eISSN - 1531-4995
pISSN - 0023-852X
DOI - 10.1288/00005537-199505000-00012
Subject(s) - venous blood , argon , carbon dioxide , partial pressure , oxygen , gas composition , nitrogen , chemistry , arterial blood , analytical chemistry (journal) , steady state (chemistry) , composition (language) , anesthesia , environmental chemistry , medicine , thermodynamics , physics , organic chemistry , linguistics , philosophy
Concomitant continuous measurements of the steady‐state gas composition of the middle ear and of the venous blood were recorded by mass spectrometry in four guinea pigs. The following mean values were obtained for the partial pressures of middle ear gases; nitrogen + argon, 606.4 mm Hg; oxygen, 46.2 mm Hg; and carbon dioxide, 60.2 mm Hg. The corresponding values for the venous blood were as follows: Nitrogen + argon, 563.4 mm Hg; oxygen, 38.0 mm Hg; and carbon dioxide, 61.4 mm Hg. The similarity of the steady‐state gas composition of the middle ear to that of the venous blood suggests that the partial pressures of the gases in the middle ear are controlled by interchange with gases present in the blood.