Idiopathic sudden sensorineural hearing loss (ISSNHL) refers to idiopathic sensorineural hearing loss of at least 30 dB over at least three test frequencies occurring over a 72-hour period. Vertigo has been considered a risk factor of poor prognosis in patients with ISSNHL. However, the clinical outcome and development of vestibular function in these patients have not been reported yet. We'd like to conduct a study on the problem whether these patients resulted in a complete recovery of the peripheral vestibular functions or compensation of the central vestibular system. If the answer is the former one, these cases might be supportive evidence of regeneration of hair cells in vestibular disorders.
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Abnormal rate of vestibular function in the Sensory Organization Test(SOT) at baseline.
Timeframe: Baseline
Recovery rate of vestibular input in the Sensory Organization Test(SOT) at 2-months follow-up after onset.
Timeframe: 2 months after onset
Abnormal rate of the caloric test at baseline.
Timeframe: Baseline
Recovery rate of the caloric test at 2-months follow-up after onset.
Timeframe: 2 months after onset
Abnormal rate of the vHIT at baseline.
Timeframe: Baseline
Recovery rate of the vHIT at 2-months follow-up after onset.
Timeframe: 2 months after onset
Abnormal rate of Cervical Vestibular Evoked Myogenic Potentials (cVEMP) at baseline.
Timeframe: Baseline
Recovery rate of Cervical Vestibular Evoked Myogenic Potentials (cVEMP) at 2-months follow-up after onset.
Timeframe: 2 months after onset
Abnormal rate of Ocular Vestibular Evoked Myogenic Potentials (oVEMP) at baseline.
Timeframe: Baseline
Recovery rate of Ocular Vestibular Evoked Myogenic Potentials (oVEMP) at 2-months follow-up after onset.
Timeframe: 2 months after onset