3 days, 30 dB, 3 frequencies
For purposes of this discussion, sudden sensorineural hearing loss develops over 12 hours or less.
Various S/S : sudden deafness during rest or activity, vertigo(30%), tinnitus(50%),usually unilateral but <4% bilateral later attack c opposite side or fluctuation
The most common presentation is a patient noticing a unilateral hearing loss on awakening.
Others notice a sudden, stable hearing loss or a rapidly progressive loss.
Occasionally, patients will note a fluctuating hearing loss, but most patients have an identifiable diagnosis.
A sensation of aural fullness in the affected ear is common and frequently is the only complaint.
Tinnitus is present in the ear to a variable degree, and the hearing loss sometimes is preceded by the onset of tinnitus. Vertigo or disequilibrium is present to a variable degree in approximately 40% of patients
Audiometry 4 types
Localized lesion of temporal bone
Cerebellopontine angle tumor
Oval and round window fistula
Aneurysm of anteroinferior cerebellar artery (AICA)
Systemic disease involving the temporal bone
Viral infection that are cochleopathic
Arteriosclerosis secondary to
Collagen vascular disease
Multiple sclerosis, syphilis, and many others
Depend on etiology
Severity of loss
The more severe the loss, the lower the prognosis for recovery, and profound losses have an exceptionally poor prognosis.
Upsloping and mid-frequency losses recover more frequently than downsloping and flat losses.
Reduced speech discrimination
Presence of vertigo
Children and adults aged more than 40 years
Summarized By Thirayost Nimmanon
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