中文摘要：

目的分析0~12月龄听力正常婴幼儿226Hz、678Hz和1000Hz探测音声导抗测试的结果,探讨不同频率探测音声导抗鼓室图在评价该年龄段婴幼儿中耳功能中的作用。方法 200例0~12月听力正常婴幼儿分成4组,每组50例：新生儿期（0~28d）、1~3月龄（±3d）、4~6月龄（±7d）,7~12月龄（±7d）,用GSI Tymp Star 2型中耳分析仪对200例（400耳）均行226Hz、678Hz和1000Hz探测音声导抗测试,分析不同年龄组婴儿、不同频率鼓室探测音声导抗图形的特点。结果①226Hz探测音测试时,外耳道容积随着年龄的增大而增大,最大的压力峰值和声顺值随年龄增大而减小②678Hz和1000Hz探测音测试时,1~3月年龄段组的最大的压力峰值和声顺值为最小,其余年龄段组最大的压力峰值和声顺值随年龄增大而增大。相同年龄段组1000Hz鼓室探测音给声时所得最大的压力峰值和声顺值均大于678Hz鼓室探测音给声时所得最大的压力峰值和声顺值。③频率和年龄的因素对鼓室图的导纳最大的压力峰值和声顺值都有显著影响。④中耳共振频率分别为：新生儿期（0~28d）为（284±48）Hz,1~3月龄组为（293±51）Hz,4~6月龄组为（450±152）Hz,7~12月龄组为（650±205）Hz。结论在评估0~6个月婴幼儿中耳功能时,应使用1000Hz探测音声导抗,在1000Hz探测音声导抗测试出现堵塞效应时,可使用678Hz探测音做补充,7-12个月婴幼儿使用226 Hz鼓室图探测音时最好同时使用1000Hz探测音做声导抗测试,不同年龄段婴幼儿应使用不同频率的探测音以及其正常值以便于准确了解婴幼儿的中耳状态。

英文摘要：

Objective To report tympanometry results at 226, 678 and 1000 Hz in infants aged from 0month to 12 months, and to evaluate the value of multiple frequency tympanometry in diagnosing middle ear function in infants. Methods A sample of 200 infants with normal hearing were divided into four groups by age： i.e. Groups 1（0 – 28 days）, 2（1 – 3 months, ± 3 days）, 3（4 – 6 months, ± 7 days） and 4（7 – 12 months, ±7 days）（n = 50 in each group）. Tympanograms from different age groups including their frequency characteristics were obtained using a GSI Tymp Star 2 Middle-Ear analyzer. Results 1） At 226 Hz, tympanometry equivalent ear canal volume（Ecv） increased with age, while tympanometric peak pressure（TPP） and peak compensated static acoustic admittance（Ymt） decreased. 2） TPP and Ymt at 678 and 1000 Hz increased with age, although the lowest TPP and Ymt was seen in infants in Group 2. Within each age group, TPP and Ymt at 1000 Hz were greater than those at 678 Hz. Probe tone frequency and age showed a remarkable impact on TPP and Ymt. 4） The middle ear resonance frequency was 284 ± 48 Hz for Group1, 293 ± 51 Hz for Group 2, 450±152 Hz for Group 3 and 650±205 Hz for Group 4. Conclusion In evaluating middle ear function in infants younger than 6 months, the 1000 Hz probe tone should be used, while the 678 Hz tone can be a supplementary option in cases when 1000 Hz tympanograms indicate an occlusion effect. For infants between7 and 12 months, the 226 Hz tone should be used for tympanogram, while the 1000 Hz tone should be used for impedance tests. Probe tones of different frequencies and different reference values should be used for different ages for accurate evaluation of middle ear functions.