交叉镫骨肌声反射客观评价鼓室成形术后听力改变

The Objective Assessment of Hearing Improvement after Tympanoplasty by CART

应用交叉镫骨肌的交叉特性,客观评价了67例单侧慢性中耳炎患者行鼓室成形术后听力改变情况。结果显示鼓膜修补术后,听力提高了17.4dB左右,(?)型鼓室成形术后听力提高超过了25dB;交叉镫骨肌声反射测试与纯音听阈测试结果间差异无显著性意义,但交叉镫骨肌测试结果有客观性,可推广应用于儿童患者和某些特殊情况,此外,交叉镫骨肌声反射较脑干听反应等客观听力检查有明显优越性,故具有重要的临床意义。

The stapedius muscles can contract bilaterally in response to sound of intensity. The cross a-coustic reflex threshold (CART) has a crossed character and relation to hearing level of stimulated ear (af-fected ear in our study). In this study, CART was tested in 67 cases with tympanoplasty for unilateral chron-ic otitis media by GS1 33 version I middle ear analyzer. The results indicated that there was about 17. 4 dB hearing improvement by myringoplasty and more than 25 dB hearing improvement by tympanoplasty with re-construction of ossicular chain on those patients. The noise-CART was more sensitive than tone-CART. There was no statistical significance between CART and pure-tone threshold in audiogram. This study tries to extend the use of CART in clinical work and offer a method for objective evaluation of the effect of-panoplasty or other operations for hearing improvement.