Dynamic characteristics of the middle ear in neonates

被引：12

作者：

Murakoshi, Michio ^{[1
]}

Yoshida, Naoto ^{[1
]}

Sugaya, Mitsuki ^{[1
]}

Ogawa, Yudai ^{[1
]}

Hamahishi, Shinji ^{[2
]}

Kiyokawa, Hiromichi ^{[3
]}

Kakuta, Risako ^{[3
]}

Yamada, Masaaki ^{[4
]}

Takahashi, Ritsuko ^{[4
]}

Tanigawara, Shingo ^{[5
]}

Matsutani, Sachiko ^{[6
]}

Kobayashi, Toshimitsu ^{[3
]}

Wada, Hiroshi ^{[1
]}

机构：

[1] Tohoku Univ, Dept Bioengn & Robot, Sendai, Miyagi 9808579, Japan

[2] Sendai Natl Coll Technol, Dept Mech Engn, Sendai, Miyagi, Japan

[3] Tohoku Univ, Grad Sch Med, Dept Otorhinolaryngol Head & Neck Surg, Sendai, Miyagi 9808579, Japan

[4] Japanese Red Cross Sendai Hosp, Perinatal Ctr, Neonatal Intens Care Unit, Sendai, Miyagi, Japan

[5] Japanese Red Cross Sendai Hosp, Dept Obstet & Gynecol, Sendai, Miyagi, Japan

[6] Japanese Red Cross Sendai Hosp, Dept Otorhinolaryngol, Sendai, Miyagi, Japan

来源：

INTERNATIONAL JOURNAL OF PEDIATRIC OTORHINOLARYNGOLOGY | 2013年 / 77卷 / 04期

基金：

日本科学技术振兴机构;

关键词：

Neonates; Middle ear; External ear; Dynamic characteristics; Sweep frequency impedance meter; OUTER HAIR-CELLS; PRODUCT OTOACOUSTIC EMISSION; LOCAL MECHANICAL-PROPERTIES; 1000 HZ TYMPANOMETRY; DEVELOPMENTAL-CHANGES; HEARING IMPAIRMENT; ADMITTANCE; INFANTS; IDENTIFICATION; POPULATION;

D O I：

10.1016/j.ijporl.2012.12.020

中图分类号：

R76 [耳鼻咽喉科学];

学科分类号：

100213 ;

摘要：

Objective: Early diagnosis and treatment of hearing disorders in neonates is highly effective for realization of linguistic competence and intellectual development. To objectively and quickly evaluate the dynamic characteristics of the middle ear, a sweep frequency impedance (SFI) meter was developed, which allowed the diagnosis of middle-ear dysfunctions in adults and children. However, this SFI meter was not applicable to neonates since the size of the measurement probe was too large. In the present study, therefore, the SFI meter was improved, i.e., the diameter of the probe was reduced to that of the neonatal external ear canal. By using this newly designed SFI meter, SFI tests were performed in healthy neonates. Methods: A sound of the sweeping sinusoidal frequency between 0.1 kHz and 2.0 kHz in 0.02-kHz step intervals is presented to the ear canal by an SFI probe while the static pressure of the ear canal is kept constant. During this procedure, the sound pressure level (SPL) is measured. The measurements are performed at 50-daPa intervals of static pressure from 200 daPa to 200 daPa. Results: Measurements were conducted in 10 ears of 9 neonates. The SPL showed two variations at 0.26 +/- 0.03 kHz and 1.13 +/- 0.12 kHz. Since the SPL is known to show a variation at frequencies from 1.0 kHz to 1.6 kHz due to the resonance of the middle ear in adults and children with normal hearing, the second variation is probably related to such resonance in neonates. The measurement of gel models, which mimics the neonatal external ear canal, showed a variation in SPL at around 0.5 kHz. This implies that the source of the first variation may possibly be related to the resonance of the external ear canal wall. Conclusions: SFI tests revealed that there were two variations in the SPL curve in neonates, one at 0.26 0.03 kHz and the other at 1.13 0.12 kHz, the former and the latter being possibly related to the resonance of the external ear canal wall and that of the middle ear, respectively. This result suggests that the dynamic characteristics of the middle ear in neonates are different from those in adults. (C) 2012 Elsevier Ireland Ltd. All rights reserved.

引用

页码：504 / 512

页数：9

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