Durante Alessandra Spada, Nascimento Polyana Cristiane, Almeida Katia de, Servilha Thamyris Rosati, Marçal Gil Junqueira, Neto Osmar Mesquita de Sousa
Faculty of Speech-Language Pathology and Audiology, Faculdade de Ciências Médicas da Santa Casa de São Paulo, São Paulo, SP, Brazil.
Department of Otorhinolaryngology, Irmandade da Santa Casa de Misericórdia de São Paulo, São Paulo, SP, Brazil.
Int Arch Otorhinolaryngol. 2022 Jun 17;26(4):e730-e737. doi: 10.1055/s-0042-1748533. eCollection 2022 Oct.
Otosclerosis is characterized by the fixation of the stapes to the oval window, thereby impairing acoustic signal absorbance. A commonly used surgical technique for improving hearing in cases of otosclerosis is stapedotomy. However, it is unclear whether this surgery restores all the physical characteristics of the tympano-ossicular system. To evaluate the tympano-ossicular system in individuals with fenestral otosclerosis pre and poststapedotomy using wideband tympanometry. A total of 47 individuals and 71 ears were assessed. The subjects were divided into three groups: presurgery otosclerosis; postsurgery; and a control group of normal-hearing adults. A handheld tympanometer with a wideband module (226-8,000 Hz) was used to take measurements at ambient pressure and under pressurized conditions. The level of statistical significance adopted was ≤ 0.05. Acoustic absorbance at 226 Hz was low for all groups. At frequencies in the range 630 to 5,040 Hz, each group had a characteristic absorbance curve, allowing them to be distinguished from one another. In the presurgery group, absorbance values were below normal levels, with energy absorbance below 10%. Low energy absorbance was most evident at 1,000 Hz in the presurgery group, but this was not observed in the postsurgery group. Although there was an improvement in hearing, the surgery failed to restore the tympano-ossicular system to normal. Wideband acoustic absorbance proved able to differentiate normal ears and otosclerotic ears pre and postsurgery, under both ambient pressure and pressurized conditions.
耳硬化症的特征是镫骨固定于卵圆窗，从而损害声信号吸收。在耳硬化症病例中，一种常用的改善听力的外科技术是镫骨切除术。然而，尚不清楚这种手术是否能恢复鼓室 - 听骨链系统的所有物理特性。
为了使用宽带鼓室导抗测量法评估镫骨窗型耳硬化症患者在镫骨切除术前和术后的鼓室 - 听骨链系统。
共评估了47名个体和71只耳朵。受试者分为三组：术前耳硬化症组；术后组；以及听力正常的成年人对照组。使用带有宽带模块（226 - 8000 Hz）的手持式鼓室导抗仪在常压和加压条件下进行测量。采用的统计学显著性水平为≤0.05。
所有组在226 Hz时的声吸收均较低。在630至5040 Hz范围内的频率下，每组都有特征性的吸收曲线，从而可以相互区分。在术前组中，吸收值低于正常水平，能量吸收低于10%。术前组在1000 Hz时低能量吸收最为明显，但术后组未观察到这种情况。尽管听力有所改善，但手术未能使鼓室 - 听骨链系统恢复正常。
宽带声吸收被证明能够在常压和加压条件下区分术前和术后的正常耳朵和耳硬化症耳朵。
