ISSN 1308-7649 | E-ISSN 2148-3817
Original Article
Implications for Bone Conduction Mechanisms from Thresholds of Post Radical Mastoidectomy and Subtotal Petrosectomy Patients
1 Department of Otorhinolaryngology, Head and Neck Surgery, Hadassah Hebrew University Medical Center, Jerusalem, Israel  
2 Department of Otology and Skull Base Surgery, Gruppo Otologico, Piacenza, Rome, Italy  
3 Speech and Hearing Center, Hadassah Hebrew University Medical Center, Jerusalem, Israel  
4 Department of Communication Disorders, Sackler School of Medicine, Tel Aviv, Israel  
5 Department of Otolaryngology, Head and Neck Surgery, Shaare Zedek Medical Center, Jerusalem, Israel  
6 Department of Medical Neurobiology (Physiology), Hebrew University-Hadassah School of Medicine, Jerusalem, Israel  
J Int Adv Otol 2019; 15: 8-11
DOI: 10.5152/iao.2019.6268
Key Words: Osseous, non-osseous, fluid inertia, ossicle inertia, distortion, radical mastoidectomy, subtotal petrosectomy
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.

 

Cite this article as: Kaufmann Yehezkely M, Grinblat G, Geal Dor M, Chordekar S, Perez R, Adelman C, et al. Implications for Bone Conduction Mechanisms from Thresholds of Post Radical Mastoidectomy and Subtotal Petrosectomy Patients. J Int Adv Otol 2019; 15(1): 8-11.

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