Birch L, Elbrønd O
Scand Audiol. 1985;14(1):5-8. doi: 10.3109/01050398509045914.
Fifty-seven children in a fairly new day-care institution were examined daily by impedance audiometry through 4 weeks. A Madsen Electronics ZS 330 tympanoscope was used. The tympanometric curves were divided into types A, C1, C2, and B, indicating pressures over -99 mmH2O, from -100 to -199 mmH2O, below -199 mmH2O and completely flat curves, but in cases in which the compliance was less than 0.25 ml, combined with an absent ipsilateral stapedial reflex, were also interpreted as type B. The object was to ascertain how quickly the types changed and how stable the B curves were. Types A + C1, C2, and B changed daily into other types in 4.3%, 32.8%, and 9.5% respectively. A total of 43 episodes of B curves occurred. Of them 16 lasted for only one day and thereamongst 9 became quite flat. Only a few lasted for 8-23 days and 8 for 26 days or over.
在一所新建的日托机构中，对57名儿童进行了为期4周的每日阻抗测听检查。使用的是Madsen Electronics ZS 330型鼓室镜。鼓室图曲线分为A、C1、C2和B型，分别表示压力超过-99 mmHg2O、-100至-199 mmHg2O、低于-199 mmHg2O以及完全平坦的曲线，但在顺应性小于0.25 ml且同侧镫骨肌反射缺失的情况下，也被解释为B型。目的是确定这些类型变化的速度以及B曲线的稳定性。A + C1型、C2型和B型每天分别有4.3%、32.8%和9.5%转变为其他类型。总共出现了43次B曲线情况。其中16次仅持续一天，其中9次变得非常平坦。只有少数持续8 - 23天，8次持续26天或更长时间。
