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Significance of the development of the inner ear third window effect after endolymphatic sac surgery in Ménière disease patients.

 Sung Huhn Kim  ;  Seung Hyun Ko  ;  Sang Hyun Ahn  ;  Jae Min Hong  ;  Won-Sang Lee 
 LARYNGOSCOPE, Vol.122(8) : 1838-1843, 2012 
Journal Title
Issue Date
Acoustic Impedance Tests ; Adult ; Auditory Threshold ; Ear, Inner/surgery* ; Endolymphatic Sac/surgery* ; Female ; Follow-Up Studies ; Hearing Loss, Conductive/etiology* ; Humans ; Male ; Meniere Disease/surgery* ; Middle Aged ; Postoperative Complications/etiology* ; Prospective Studies ; Reflex, Acoustic/physiology ; Semicircular Canals/surgery* ; Vestibular Evoked Myogenic Potentials/physiology ; Vestibular Function Tests
Menie`re disease ; endolymphatic sac ; air–bone gap ; inner ear third window
OBJECTIVES/HYPOTHESIS: The goal of this study was to identify the clinical significance of the low-frequency air-bone gap (LFABG) that often develops after endolymphatic sac surgery.

STUDY DESIGN: Prospective study.

METHODS: Sixteen patients who had been diagnosed with definite Ménière disease and underwent endolymphatic sac surgery were studied. The surgical outcome was evaluated based on the 1995 guidelines of the American Academy of Otolaryngology-Head and Neck Surgery. The number of patients who developed LFABGs (a mean air-bone gap >10 dB HL at 250, 500, and 1,000 Hz) after surgery was determined, and the significance of the LFABGs was evaluated by analyzing their relation with the surgical outcome.

RESULTS: The vertigo spells of nine patients were completely controlled (class A). The number of vertigo spells was reduced by 60% to 99% in 6 patients (class B) and by 20% to 59% in 1 patient (class C). Postoperative LFABGs were observed in 13 patients. The mean LFABG of the patients in class A was significantly larger than that of the patients in classes B and C (25.0 ± 7.6 dB nHL in class A vs. 10.0. ± 7.5 dB nHL in class B and C; P = .005).

CONCLUSIONS: Based on the data of the current study, we conjectured that the correlation of large LFABGs with excellent vertigo control in this study may be due to a third window phenomenon related to bony decompression of the endolymphatic sac and duct, and may serve as a favorable prognostic marker.
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1. College of Medicine (의과대학) > Dept. of Otorhinolaryngology (이비인후과학교실) > 1. Journal Papers
Yonsei Authors
Ko, Seung Hyun(고승현)
Kim, Sung Huhn(김성헌)
Ahn, Sang Hyeon(안상현) ORCID logo https://orcid.org/0000-0002-2389-0005
Lee, Won Sang(이원상)
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