Evans R A, Day G A, Browning G G
Department of Otolaryngology, Royal Infirmary, Glasgow, UK.
Clin Otolaryngol Allied Sci. 1989 Aug;14(4):317-21. doi: 10.1111/j.1365-2273.1989.tb00379.x.
Temporal bone studies have demonstrated that a modified radical mastoidectomy changes the resonant characteristics of the external auditory canal, but the effect has not been reported in patients. In 12 patients, performing open-cavity mastoid surgery for cholesteatoma changed the mean peak resonant frequency of the external ear canal from 2.5 to 2.2 kHz (p less than 0.02). This is in comparison with creating a modified radical mastoid cavity in 6 temporal bones which changed the mean peak resonant frequency of the external ear canal from 3.9 to 1.9 kHz. It is concluded that open-cavity mastoid surgery in patients changes the acoustics of the external ear canal less than in temporal bone studies.
颞骨研究表明，改良乳突根治术会改变外耳道的共振特性，但该影响在患者中尚未见报道。在12例患者中，因胆脂瘤而行开放式乳突手术使外耳道的平均峰值共振频率从2.5 kHz变为2.2 kHz（p<0.02）。相比之下，在6块颞骨上创建改良乳突根治术腔，外耳道的平均峰值共振频率从3.9 kHz变为1.9 kHz。得出的结论是，患者行开放式乳突手术对外耳道声学特性的改变小于颞骨研究中的改变。
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