[Idiopathic sudden deafness: a report of 96 patients].

Abstract

Objectives: Evaluation of the management of idiopathic sudden deafness indicating the usefulness of biological assessments and the pronostic factors of hearing recovery.

Patients and methods: This is a retrospective study of 96 patients with idiopathic sudden deafness referred to a tertiary centre between 2005 and 2009 treated with corticosteroids intravenously at a daily dose of 1 mg/kg. Mean tonal thresholds were assessed (PTA = [500 Hz + 1000 Hz + 2000 Hz + 4000 Hz]/4). Each audiogram was classified as five classes according to its frequency profile.

Results: The hearing recovery is significant between D0-D5 and D5-M1 for the frequencies 0.5, 1 and 2 kHz. For 4 kHz, the recovery is significant between 0 and J5. There is no statistically significant correlation between the presence of associated signs (tinnitus, vertigo) and hearing recovery. Hearing recovery according to the five types of audiograms has the same evolution in the follow-up time but with audiograms type E (cophosis or subcophosis) often associated with an hyporeactivity at the videonystagmography. The presence of cardiovascular disease is a predictor of poor hearing recovery. The usefullness of systematic extensive blood tests is low.

Conclusion: In sudden deafness, the maximum hearing recovery takes place in the month following the onset of symptoms. The predictors of poor hearing recovery are an initial mean threshold > 70 dB, the existence of an associated cardiovascular disease.