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Negative pressure produced by bacteria: A possible cause of negative middle ear pressure in ears with otitis media


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タイトル: Negative pressure produced by bacteria: A possible cause of negative middle ear pressure in ears with otitis media
著者: Kitaoka, Kyoko / Takahashi, Haruo
発行日: 2016年 9月
出版者: Nagasaki University School of Medicine / 長崎大学医学部
引用: Acta medica Nagasakiensia, 60(4), pp.141-144; 2016
抄録: Conclusions: It is suggested that oxygen consumption by bacteria could be a cause of the negative middle ear pressure in ears with otitis media. Objective: To determine whether oxygen consumption and production of carbon dioxide by bacteria could be a cause of negative pressure in ears with otitis media. Methods: Hermetically-sealed tubes (2ml of volume) containing 1 ml of culture media with Streptococcus pneumoniae leaving 1 ml of airspace were connected to a micro-pressure sensor, and were maintained at 37 degree centigrade in a water bath. Chronological changes of air pressure in the tube were monitored for 15 hours (bacterial group), and were compared with those in the tubes containing culture media only controls). Also, partial pressures of oxygen and carbon dioxide in the culture media of those bottles were measured. Results: The pressure of the bacterial group were significantly lower than that of controls (bacterial group; -94.6±92mmH2O, control group; 4.6±11.1mmH2O, 2 way-ANOVA, P<0.001). The partial pressures of oxygen were lower (bacterial group; -86.0±22.1mmHg, control group; -34.6±7.93mmHg, 2 way-ANOVA, P<0.0001) and those of carbon dioxide were significantly higher in the bacterial group than in the control group (bacterial group; 11.8±3.8mmHg, control group; -0.23±0.41mmHg, 2 way-ANOVA, P<0.0001).
キーワード: Bacteria / negative middle ear pressure / otitis media / oxygen consumption
URI: http://hdl.handle.net/10069/36873
ISSN: 00016055
資料タイプ: Departmental Bulletin Paper
原稿種類: publisher
出現コレクション:Volume 60, No. 4

引用URI : http://hdl.handle.net/10069/36873

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