鼓膜穿孔对真耳-耦合腔差的影响  

Effects of tympanic membrane perforation on real-ear to coupler difference

作　　者：刘平[1] 陈淑飞[1] 郑周数[1] 

机构地区：[1]宁波大学医学院附属医院耳鼻咽喉科,浙江宁波315020

出　　处：《临床耳鼻咽喉头颈外科杂志》2008年第7期303-305,共3页Journal of Clinical Otorhinolaryngology Head And Neck Surgery

摘　　要：目的:探讨鼓膜穿孔对真耳-耦合腔差(RECD)的影响。方法:34例(34耳)中耳功能及听力正常成人为对照组,30例(34耳)干性鼓膜穿孔患者为实验组,用真耳分析仪测试RECD。结果:实验组与对照组RECD值比较在1kHz以下(含1kHz)及4kHz差异有统计学意义(P<0.05),实验组比对照组要小;实验组的标准差变化较大,平均为4.4dB,而对照组为1.4dB;实验组RECD值与等效外耳道容积大小在0.75kHz以下呈显著负相关(r=-0.70,P<0.01),而1kHz以上无相关性;鼓膜穿孔大小对RECD值无影响。结论:鼓膜穿孔患者RECD值在不同频率变化较大,选配助听器时应进行真耳测量以测试个体RECD,尽量不用平均值,适当增加低频的增益。Objective： To inveestigate the effects of tympanic membrane perforation on real-ear to coupler difference （RECD） in adults. Method：RECD was measured in 34 ears with dry tympanic membrane perforation,34 normal subjects served as controls. Result： There was significant difference （P（0.05） below 1 kHz （including 1 kHz） and in 4 kHz between experimental group and control group. For perforated ears, RECD was 3.5-15 dE less from 250 Hz to 1 kHz while the values of RECD was negative from 250 Hz to 750 Hz. A larger standard deviation was found in experimental group. The mean intra-subject standard deviation was 4. 4 dE in experimental group as contrasted with 1.4 dE in control group. The equivalent ear canal volume appeared to be negatively correlated with the RECD reduction below 0.75 kHz and no correlation above 1 kHz. The more the equivalent ear canal volume, the smaller the RECD. It was found that the size of tympanic membrane perforation had no effect on RECD. Conclusion： It is recommended to perform real-ear measurement individually instead of using the age-appropriate average values ,and to increase low frequency gain appropriately when fitting hearing aids for patients with dry tympanic membrane perforation.

关 键 词：鼓膜穿孔 真耳测量 助听器 

分 类 号：R764.29[医药卫生—耳鼻咽喉科]