Correlation of Air-Bone Gap on Pure Tone Audiometry with the Size of Perforation Assessed on Oto-Endoscopy.

Aiman Fatima Naqvi, Syeda Uzma Naqvi, Nida Khan, Murtaza Ahsan Ansari, Iqbal A Muhammad Khyani
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Abstract

Objective: To determine the correlation between the air-bone gap on pure tone audiometry with size of perforation oto-endoscopically.  Study Design: A descriptive study. Place and Duration of the Study: Department of ENT - Head and Neck Surgery, Dow University of Health Sciences (DUHS), from February 2020 to August 2021.  Methodology: A total of 43 patients with dry central pars tensa tympanic membrane perforation were diagnosed through oto-endoscopy during the study. The mean air-bone gap was calculated by assessing each air-bone gap through pure tone audiometry at different frequencies i.e., 250 Hz, 500 Hz, 1,000 Hz, 2,000 Hz, and 4,000 Hz. Air-bone gap was found to be the average value of these frequencies. The photograph of the tympanic membrane was taken oto-endoscopically, and the ratio between size of the perforation to the entire area of the tympanic membrane was measured.

Results: During the course of the study, a total of 43 patients agreed to provide consent for this study. Out of the 43 patients, 16 (37.2%) were males and 27 (62.8%) were females. The age range was from 18 to 50 years with average age of 38.302 ± 5.74 years. The mean perforation size was 28.255 ± 9.16% while the mean air-bone gap was 28.000 ± 3.89 dB. It was concluded that the Pearson's correlation coefficient is directly correlated to perforation size and air-bone gap (r = 0.898, p <0.001). Further, hearing loss decreases with decreased middle ear volume and mastoid pneumatisation. Moreover, no change was seen in the mean air-bone gap according to the location of perforation.

Conclusion: The hearing loss due to perforation of the tympanic membrane was correlated to the size of the perforation. Further, hearing loss decreases with reduced middle ear volume and mastoid pneumatisation.

Key words: Size of perforation, Hearing loss, Air-bone gap, Oto-endoscopy, Conductive deafness, Mastoid pneumatisation.

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纯音听力计显示的气骨间隙与耳内镜评估的穿孔大小的相关性
目的确定纯音测听的气骨间隙与经鼻内镜穿孔大小之间的相关性。 研究设计:描述性研究。研究地点和时间:道尔健康科学大学(DUHS)耳鼻咽喉头颈外科,2020 年 2 月至 2021 年 8 月。 研究方法:研究期间,通过耳内镜检查共确诊了43名干性中央型鼓膜旁穿孔患者。通过不同频率(250 Hz、500 Hz、1,000 Hz、2,000 Hz 和 4,000 Hz)的纯音测听评估每个气骨间隙,计算平均气骨间隙。气骨间隙是这些频率的平均值。通过耳内镜拍摄鼓膜照片,测量穿孔大小与鼓膜整个面积的比率:在研究过程中,共有 43 名患者同意参与本研究。在 43 名患者中,男性 16 人(占 37.2%),女性 27 人(占 62.8%)。年龄在 18 至 50 岁之间,平均年龄为(38.302 ± 5.74)岁。平均穿孔大小为 28.255 ± 9.16%,平均气骨间隙为 28.000 ± 3.89 dB。结论是,皮尔逊相关系数与穿孔大小和气骨间隙直接相关(r = 0.898,p 结论:鼓膜穿孔导致的听力损失与穿孔的大小有关。此外,听力损失会随着中耳容积减小和乳突气化而减少:穿孔大小 听力损失 气骨间隙 耳内镜检查 传导性耳聋 乳突气化
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