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Wideband acoustic immitance - Absorbance measurements in ears after stapes surgery.
Metadata
Journalauris nasus larynx1.436Date
2020 Jun 04
4 months ago
Type
Journal Article
Volume
2020-Jun-04 / :
Author
Niemczyk E 1, Lachowska M 2, Tataj E 3, Kurczak K 4, Niemczyk K 1
Affiliation
  • 2. Department of Otorhinolaryngology Head and Neck Surgery, Medical University of Warsaw, ul. Banacha 1a, 02-097 Warszawa, Poland. Electronic address: [email protected]
  • 3. Department of Medical Informatics and Telemedicine, Medical University of Warsaw, Poland.
  • 4. Centre for Foreign Languages, Medical University of Warsaw, Poland.
Doi
PMIDMESH
Abstract
OBJECTIVES: The study aimed to thoroughly assess absorbance in ears after stapes surgery (stapedotomy/stapedectomy) and how stapes surgery affects wideband acoustic immittance (WAI) metrics.
METHODS: Eighty-three otosclerotic ears were analyzed pre- and postoperatively. The analysis comprised: air-bone gap (ABG) and WAI which included absorbance measurements, resonance frequency assessment, low frequency tympanometry and metrics derived from these measures.
RESULTS: Absorbance after stapes surgery changed considerably compared to otosclerotic ears before surgery and also differed from normal ears. Absorbance after stapes surgery revealed two significantly different plot types: single-low-frequency-peak absorbance and two-peaks absorbance. Stapes surgery reduced resonance frequency in majority of operated ears and increased static compliance in low frequency tympanometry. Static compliance difference was directly proportional to ABG improvement at low frequencies. Postoperative ABG at 250 Hz and 500 Hz was most commonly correlated with postoperative WAI parameters. ABG improvement at 3000 Hz and 4000 Hz was directly proportional to absorbance difference at ~3000 Hz and 4000 Hz. It influenced the width of the postoperative absorbance by shifting both sides of the plot (negative values shift the points of the plot toward lower frequencies) with the correlation being more pronounced in postoperative two-peaks absorbance type ears.
CONCLUSIONS: Absorbance by itself is not sufficient for assessment of changes to middle function following stapes surgery, and should be complemented with other measures. WAI measurements including absorbance, resonance frequency assessment, low frequency tympanometry, and metrics derived from these measures combined with air-bone gap provide insight into mechano-acoustic changes in the middle-ear system as a result of stapes surgery.
Keywords: Absorbance Air-bone gap Hearing loss Stapedectomy Stapes surgery Wideband tympanometry
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Auris Nasus Larynxauris nasus larynx
Metadata
LocationNetherlands
FromELSEVIER SCI LTD

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