EAR-CANAL IMPEDANCE AND REFLECTION COEFFICIENT IN HUMAN INFANTS AND ADULTS
EAR-CANAL IMPEDANCE AND REFLECTION COEFFICIENT IN HUMAN INFANTS AND ADULTS
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DOI：
10.1121/1.407347
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发表时间：
1993-11-01
影响因子：
2.4
通讯作者：
BURNS, EM
中科院分区：
文献类型：
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作者：
KEEFE, DH;BULEN, JC;BURNS, EM
在 125-10 700 Hz 频率范围内测量成人组和 1、3、6、12 和 24 个月婴儿组的耳道阻抗和反射系数。外耳道和中耳的发育强烈影响输入阻抗和反射系数响应，并且这种发育在 24 个月大时尚未完成。影响因素包括耳道面积和长度的增长、年幼婴儿耳道壁的共振以及中耳腔生长的可能影响。婴儿的中耳顺应性低于成人，而中耳阻力较高。传递到婴儿中耳的功率比传递到成人中耳的功率少得多。这种功率传输的差异直接影响听力的行为和生理测量。新生儿鼓室图解读的困难被证明是耳道壁振动的结果。建议将 2-4kHz 范围内的阻抗和反射率测量作为规避这些困难的潜在有用的临床工具。
The ear-canal impedance and reflection coefficient were measured in an adult group and in groups of infants of age 1, 3, 6, 12, and 24 months over frequency range 125-10 700 Hz. The development of the external ear canal and middle ear strongly affect input impedance and reflection coefficient responses, and this development is not yet complete at age 24 months. Contributing factors include growth of the area and length of the ear canal, a resonance in the ear-canal walls of younger infants, and a probable influence of growth of the middle-ear cavities. The middle-ear compliance is lower in infants than adults, and the middle-ear resistance is higher. The power transfer into the middle ear of the infant is much less than into that of the adult. Such differences in power transfer directly influence both behavioral and physiological measurements of hearing. The difficulties of interpretation of neonatal tympanograms are shown to be a consequence of ear-canal wall vibration. Impedance and reflectance measurements in the 2-4-kHz range are-recommended as a potentially useful clinical tool for circumventing these difficulties.