Otoacoustic Emissions IV. EOAE in Sudden Hearing Disorders.

Czech version

Authors: J. Valvoda; J. Betka; T. Haas ^*
Authors‘ workplace: Klinika otorinolaryngologie a chirurgie hlavy a krku FN Motol a 1. LF UK, Praha, katedra otorinolaryngologie IPVZ, Praha, přednosta prof. MUDr. J. Betka, DrSc. III. interní klinika VFN a 1. LF UK, Praha, vedoucí prof. MUDr. Marek J., DrSc. ^*
Published in: Otorinolaryngol Foniatr, , 1999, No. 2, pp. 100-105.
Category:

Overview

EOAE were examined repeatedly in 18 patients with a sudden hearing loss at lowfrequencies due to Meniere’s disease or cochlear hydrops. It was revealed that EOAE could berecorded at the time of the attack in 14 patients. TEOEA were detectable particulary in the lowfrequency part of the spectrum (1-3 kHz). After recovery of hearing TEOAE remain unchanged orreach normal levels. DPOAE reach normal levels. A favourable prognostic value of positive TEOAEas regards normalization of hearing was not proved by statistical analysis. Nevertheless in none offour patients with negative emissions improvement of hearing was observed. The authors submit ahypothesis concerning association between the magnitude of hearing loss at 1000 Hz and thedetectability of TEOAE as well as restoration hearing. TEOAE were negative in 10 cases and DPOAEin 9 cases in the group of 10 patients with a sudden severe idiopathic hearing loss (ISHL). Reappearenceof DPOAE and TEOAE was observed in four patients with ISHL. EOAE do not contribute to the estimationof the prognosis in ISHL. However the restitution of EOAE after the improvement of hearing gives anevidence of reversible changes of an active non-linear mechanisms of the inner ear in ISHL.

Key words:
EOAE, sudden deafness, Meniere’s disease, prognostic use.

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