Tos M, Poulsen G, Hancke A B
Acta Otolaryngol. 1979;88(5-6):388-94. doi: 10.3109/00016487909137183.
150 healthy children were regularly investigated with tympanometry during the first year of life. Normal middle ear pressure was found in nearly all children at birth. At the age of 6 months, 62% of the ears had a pressure of 0-99 mmH2O. In 37% the pressure was between -100 and -350 mmH2O and 1% had flat curves. At the age of 9 months, the tympanograms further deteriorated and at 12 months, only 40% of the ears had a pressure of 0 to -99 mmH2O, 28% had a pressure of -100 to -199 mmH2O, 19% a pressure of -200 to -350 mmH2O and 13% had flat curves, indicating secretory otitis. At 1 year, the tympanograms were worse than in any other age group investigated so far. The dominant cause of the reduced middle ear ventilation was catarrhalia, the frequency of which increased during the period from 6 to 12 months.
150名健康儿童在出生后的第一年接受了定期的鼓室图检查。几乎所有儿童在出生时中耳压力均正常。6个月大时，62%的耳朵压力为0 - 99毫米水柱。37%的耳朵压力在-100至-350毫米水柱之间，1%的耳朵鼓室图呈平坦曲线。9个月大时，鼓室图进一步恶化，到12个月时，只有40%的耳朵压力为0至-99毫米水柱，28%的耳朵压力为-100至-199毫米水柱，19%的耳朵压力为-200至-350毫米水柱，13%的耳朵鼓室图呈平坦曲线，提示分泌性中耳炎。1岁时，鼓室图比迄今为止所研究的任何其他年龄组都要差。中耳通气减少的主要原因是卡他性炎症，其发生率在6至12个月期间有所增加。
