Changes in external ear resonance after ventilation tube (Grommet) insertion in children with otitis media with effusion

被引:1
|
作者
Hong, SH [1 ]
Cho, YS [1 ]
Chung, WH [1 ]
Koh, SJ [1 ]
Seo, IS [1 ]
Woo, HC [1 ]
机构
[1] Sungkyunkwan Univ, Sch Med, Samsung Med Ctr, Dept Otorhinolaryngol Head & Neck Surg, Seoul, South Korea
关键词
external ear resonance; middle ear ventilation; otitis media with effusion;
D O I
10.1016/S0165-5876(01)00420-7
中图分类号
R76 [耳鼻咽喉科学];
学科分类号
100213 ;
摘要
Objective: As otitis media with effusion is common in children, the effects of a ventilation tube should be taken into account in the prescription of hearing aids for children. In ears with a ventilation tube, the external auditory canal communicates directly with the middle ear space, and so the impedance of the middle ear may change. Consequently, this will affect external-ear resonance. The aim of this study is to observe the effects of the tympanic membrane perforations caused by the ventilation tube on external-ear resonance. We selected 30 ears with otitis media with effusion to measure external-ear resonance before and after ventilation tube insertion. We compared the external-ear resonance of a control group with that of the otitis media with the effusion group and two types of ventilation-tube groups, respectively, In the subjects who have otitis media with effusion, the average gain of the peak resonance was larger than that in the control group. After ventilation-tube insertion, the amplitude of the gain decreased to the same level as the control group, but a characteristic negative gain appeared around 1000 Hz in about half of all cases. This negative gain was observed more frequently in the ventilation tube with a larger diameter. The raised peak resonance gain in the otitis media with effusion group decreased to a level roughly the same as that of the control group after ventilation-tube insertion. Provision of an additional gain in the low frequencies around 1000 Hz should be considered for patients with a ventilation tube when prescribing hearing aids. (C) 2001 Elsevier Science Ireland Ltd. All rights reserved.
引用
收藏
页码:147 / 152
页数:6
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