Journal of Clinical Otolaryngology Head and Neck Surgery (임상이비인후과)

The Busan, Ulsan, Gyeoungnam Branch of Korean Society of Otolaryngology-Head and Neck Surgery (대한이비인후과학회 부산,울산,경남 지부회)
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The Changes of External Ear Resonance after Surgery for Repair of the Postauricular Meato-Mastoid Cutaneous Fistula

외이도-유양동-귀뒤바퀴피부 누공환자에서 수술 전, 후의 외이도 공명의 변화

  • Kim, Sangjun (Department of Otorlaryngology-Head and Neck Surgery, Dong-A University College of Medicine) ;
  • Kang, Myung Koo (Department of Otorlaryngology-Head and Neck Surgery, Dong-A University College of Medicine) ;
  • Jeong, Sung Wook (Department of Otorlaryngology-Head and Neck Surgery, Dong-A University College of Medicine) ;
  • Lee, Dong Kun (Department of Otorlaryngology-Head and Neck Surgery, Dong-A University College of Medicine)
  • 김상준 (동아대학교 의과대학 이비인후-두경부외과학교실) ;
  • 강명구 (동아대학교 의과대학 이비인후-두경부외과학교실) ;
  • 정성욱 (동아대학교 의과대학 이비인후-두경부외과학교실) ;
  • 이동근 (동아대학교 의과대학 이비인후-두경부외과학교실)
  • Received : 2018.08.03
  • Accepted : 2018.11.06
  • Published : 2018.12.30

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Abstract

Due to the structure with one end closed, the external ear resonance effect in which the high frequency is amplified can be generated, and the sound can be perceived well. The external ear resonance normally has a first peak and a second peak. On average, the first peak has a gain of 18.6 dB at 2620 Hz and the second peak has a gain of 18.2 dB at 4210 Hz. The resonance of the external auditory canal changes with the state of the tympanic membrane, the presence of the ventilation tube, and the structure (length, diameter, shape) of the external auditory canal. A patient with a postauricular meatomastoid cutaneous fistula was admitted to the hospital with a foreign body which is the molding of the hearing aid. After removal of the foreign body, the resonance of the external auditory canal was lost and the subjective sound cognitive ability decreased. In the case of postauricular meatomastoid cutaneous fistula, we confirmed the improvement of sound cognitive ability, the change of pure tone hearing threshold, and the change of the external ear resonance after reconstruction of the ear canal without middle ear reconstruction.

Keywords

Acknowledgement

Supported by : Dong-A University

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