Department of Otolaryngology, 49573Jagiellonian University Medical College, Kraków, Poland.
Ear Nose Throat J. 2021 May;100(4):NP193-NP197. doi: 10.1177/0145561319864571. Epub 2019 Sep 26.
Otosclerosis is an underlying disease of the bony labyrinth. This disorder, occurring only within the area of a person's temporal bone, is characterized by a progressive hearing loss and tinnitus.
The study looked for the answer to the question of whether the presence or absence of Carhart notch in the presurgical tonal audiogram affects the final outcome of the otosclerosis surgery.
The analysis included 140 patients operated on for the first time due to otosclerosis between 2010 and 2016. The study group consisted of 107 women aged from 19 to 62 (average age: 40.33) and 33 men aged 27 to 59 (average age: 38.23). Analysis showed a statistically better result of stapedotomy in patients without the notch than in the same procedure in patients with the notch present. The opposite situation occurred in the case of stapedectomy.
(1) The presence of a refraction of the bone conduction curve with a depth of 10 to 20 dB at a frequency of 2000 Hz (the so-called Carhart notch) in the presurgical tonal audiogram is an unfavorable prognostic factor in relation to closing the cochlear reserve and improving bone conduction after the stapedotomy. (2) Regardless of the presence or absence of Carhart notch in the presurgical tonal audiogram, stapedotomy is the procedure with the highest efficiency in the treatment of otosclerosis.
耳硬化症是一种内耳骨迷路疾病。这种仅发生在颞骨区域的疾病，其特征是进行性听力损失和耳鸣。
本研究旨在探讨术前纯音听阈测试中卡哈切迹的存在与否是否影响耳硬化症手术的最终结果。
该分析纳入了 2010 年至 2016 年间首次因耳硬化症接受手术的 140 例患者。研究组包括 107 名年龄在 19 至 62 岁之间（平均年龄：40.33 岁）的女性和 33 名年龄在 27 至 59 岁之间（平均年龄：38.23 岁）的男性。分析显示，在没有切迹的患者中，镫骨切除术的效果明显优于有切迹的患者。而在镫骨切除术的情况下则相反。
（1）术前纯音听阈测试中骨导曲线在 2000Hz 处出现 10-20dB 深的折射（即所谓的卡哈切迹），这是镫骨切开术关闭耳蜗储备和改善骨导的不利预后因素。（2）无论术前纯音听阈测试中是否存在卡哈切迹，镫骨切除术都是治疗耳硬化症最有效的方法。
