O2 tension changes in the tympanic cavity and role of the capillary strucutre in human mastoid cells.

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Respiratory activity (gas metabolism) of the middle ear cavity (including the mastoid cells) plays an important role in ventilation by opening and closing the auditory tube in a normobaric environment. Electron microscopy shows that the submucosal capillaries of the human mastoid cells are structures which facilitate the intra- and extravascular transport of substances.The measurement of oxygen tension (PO2) in the middle ear cavity by a PO2 sensor inserted via the auditory tube revealed that the oxigen tension remained constant despite the opening and closing of the auditory tube with swallowing or the closure of the tube. However, the tympanic membrane showed varying compliance, suggesting the probable production of another gas (CO2).The results indicate that tubal ventilation in a normobaric environment maintains the internal pressure of the middle ear cavity similar to or slightly higher than the external pressure by the production of another gas, by making the gas flow from the pharyngeal side to the middle ear cavity less likely.This phenomenon suggests that a low oxygen tension in the middle ear cavity is useful in preventing infection of the middle ear cavity, and that the gas metabolic function of the mastoid cells is, in view of their characteristic submucosal capillary structure and relative volume is larger than the tympanic cavity, very influential in maintaining the ventilatory function of the middle ear cavity.
耳鼻咽喉科臨床学会の論文

O2 tension changes in the tympanic cavity and role of the capillary strucutre in human mastoid cells.

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