The annual incidence of sudden sensorineural hearing loss (SSNHL) is 5 to 20 per 100 000 persons. The pathophysiology of SSNHL and acute vestibulo-cochlear syndromes (VCS) is unknown in more than 70% of cases. Hypothesis : an inner ear microvascular disease represents the key element in the pathogenesis of SSNHL and acute VCS. Plasma serotonin has among other tissular effect a vasospastic on microcirculation such as the inner ear microvascularisation. Increased plasma homocysteine has a deleterious effect on vascular endothelium. Inner ear microvascularisation sensitized by an increased homocysteine level and the vascular wall would vasoconstrict under serotonin stimulation inducing ischemia of the vestibular and/or cochlear organs.
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Mean PTA (mean of the change of the hearing thresholds for the 3 most affected contiguous frequencies) at D15 as defined by the AAO-HNS
Timeframe: At Day 15