Implications for bone conduction mechanisms from thresholds of post radical mastoidectomy and subtotal petrosectomy patients

Michal Kaufmann Yehezkely, Golda Grinblat, Miriam Geal Dor, Shai Chordekar, Ronen Perez, Cahtia Adelman, Haim Sohmer

Research output: Contribution to journalArticlepeer-review

Abstract

OBJECTIVES: To assess bone conduction (BC) thresholds following radical mastoidectomy and subtotal petrosectomy, in which the tympanic membrane and the ossicular chain, responsible for osseous BC mechanisms, are surgically removed. The removal of the tympanic membrane and the ossicular chain would reduce the contributions to BC threshold of the following four osseous BC mechanisms: the occlusion effect of the external ear, middle ear ossicular chain inertia, inner ear fluid inertia, and distortion (compression–expansion) of the walls of the inner ear. MATERIALS and METHODS: BC thresholds were determined in 64 patients who underwent radical mastoidectomy and in 248 patients who underwent subtotal petrosectomy. RESULTS: BC thresholds were normal (≤15 dB HL, i.e., better) in 19 (30%) radical mastoidectomy patients and in 19 (8%) subtotal petrosectomy patients at each of the frequencies assessed (0.5, 1.0, 2.0, and 4.0 kHz). CONCLUSION: Normal BC thresholds seen in many patients following mastoidectomy and petrosectomy may be induced by a non-osseous mechanism, and the onset (“threshold”) of the classical osseous BC mechanisms may be somewhat higher.

Original languageEnglish
Pages (from-to)8-11
Number of pages4
JournalJournal of International Advanced Otology
Volume15
Issue number1
DOIs
StatePublished - 2019

Keywords

  • Distortion
  • Fluid inertia
  • Non-osseous
  • Osseous
  • Ossicle inertia
  • Radical mastoidectomy
  • Subtotal petrosectomy

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