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KMID : 0361020010440020148
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Korean Journal of Otolaryngology - Head and Neck Surgery
2001 Volume.44 No. 2 p.148 ~ p.152
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The Changes of external ear resonance before and after surgery in chronic otitis media
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조양선/Yang Sun Cho
서인석/우효창/고석주/정원호/홍성화/In Seok Seo/Hyo Chang Woo/Seok Joo Koh/Won Ho Chung/Sung Hwa Hong
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Abstract
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Background and Objectives: External ear resonance(EER) can normally increase the sound pressure level at the tympanic membrane by as much as 20 dB at the frequency between 2 and 4 kHz. Perforation of tympanic membrane(TMP) may alter the resonance
characteristics. Surgical modifications of the external auditory canal by tympanoplasty may also change the EER features. We aimed to analyze the EER of patients with the TMP before and after surgery. Materials and Method: This study comprised of
130
patients (135 ears) with chronic otitis media. We checked EERs before and after the surgery. The preoperative group was divided into two groups according to perforation size. Postoperatively, the EER was checked at 3, 6, 9, 12 months or after 15
months.
We compared these data with the control group which comprised of 96 adult ears. Results: In the preoperative group, the peak resonant gain and the frequency were not different from the control's and the peculiar negative peaks appeared around
1500
Hz in
half of the cases. No significant differences were found in the first peak gains according to the perforation size. The negative peaks appeared deeper in the larger perforation group. After tympanoplasty, the gain markedly increased. As time
passed, the
gain tended to decrease, but did not equalize with the control's data. Conclusion: Additional gain should be considered in the frequency of around 1 kHz for hearing aid users with the TMP. We could expect alterations of EER after tympanoplasty,
suggesting that these changes should be considered at the time of fitting hearing aids.
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