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中耳【病理生理】鼓膜内外的气压藉吞咽或打哈欠时空气通过咽鼓管(ET)进入中耳而得到平衡。Elner直接测得ET功能良好的中耳气压和环境中气压接近。据实验中耳内空气被吸收可以忽略不计,即向中耳内吹入普通空气和纯氧,其吸收率都很低。在生理情况下中耳内气体的组成和周围环境中气体相同。有些学者认为中耳通常处于负压状态,其原因:(1)中耳内空气持续地被吸收,吸收的速度和中耳含气系统的体积有关,如体积为9～14ml,速度为33ml/小时将造成30～65mmH_2O/小时的负压。(2)由于纤毛活动正常分泌物从ET排出造成约1.7
Middle Ear [Pathophysiology] The pressure inside and outside the tympanic membrane by swallowing or yawning air through the Eustachian tube (ET) into the middle ear and balance. Elner directly measured ET with good middle-air pressure and ambient air pressure close. According to the experiment, the air in the middle ear is absorbed negligibly, that is, the common air and pure oxygen are blown into the middle ear, and the absorption rate is very low. Under physiological conditions, the composition of the gas in the middle ear is the same as that in the surrounding environment. Some scholars believe that the middle ear is usually under negative pressure, the reason: (1) the air in the middle ear is continuously absorbed, the speed of absorption and volume of the middle ear gas system, such as the volume of 9 ~ 14ml, the speed of 33ml / Hours will result in 30 ~ 65mmH_2O / hour negative pressure. (2) Approximately 1.7 due to normal excretion of ciliary activity from ET