Hergils L, Magnuson B
Arch Otolaryngol. 1985 Feb;111(2):86-9. doi: 10.1001/archotol.1985.00800040050004.
Tympanograms were taken in the early morning in 25 persons with healthy ears. A first tympanogram was obtained shortly after waking up while the subject was still recumbent, and a second tympanogram was taken in the upright position after chewing and swallowing. Positive middle-ear pressure was found in a majority of ears, and the pressure was reduced after swallowing. The present results indicate that gas absorption from the middle ear is not important in quantitative terms during sleep. Otherwise the morning pressure would be expected to be negative. Two other experiments showed that the middle-ear pressure increased during shallow "sleep-type" breathing, and decreased during hyperventilation. The present results can be explained by diffusion of carbon dioxide over the middle-ear mucosa, the direction of gas transfer being dependent on the breathing pattern.
对25名听力正常的人在清晨进行鼓室图检查。受试者醒来后仍处于卧位时，很快获得第一张鼓室图，咀嚼和吞咽后取直立位获得第二张鼓室图。多数耳朵发现中耳正压，吞咽后压力降低。目前的结果表明，睡眠期间中耳气体吸收在数量上并不重要。否则预期早晨压力会为负值。另外两项实验表明，在浅的“睡眠型”呼吸期间中耳压力升高，而在过度通气期间降低。目前的结果可以用二氧化碳在中耳黏膜上的扩散来解释，气体转移方向取决于呼吸模式。
