For purposes of this discussion, sudden sensorineural hearing loss develops
over 12 hours or less.
Incidence 5-10%/100,000/yr
40-60 YO
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
S/S
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
Downsloping
Upsloping
Flat loss
Profound loss
Unknown
Viral (labyrinthitis, neuronitis, ganglionitis)
Vascular theory
Cerebellopontine angle tumor
Goodhill : Round window fistula
Wetmere and Abrason : bullous myringitis
Others : change of physical env., alcohol, DM, arteriosclerosis, pill,
surgery
Classification
Localized lesion of temporal bone
Acoustic neuroma
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
Accelerated coagulogram
Hypervicosity
Polycytemia vera
Macroglobulinemia
Arteriosclerosis secondary to
Aging
Hypertension
Diabetic
Hyperlipidemia
Collagen vascular disease
Multiple sclerosis, syphilis, and many others
Systematic evaluation
Otologic examination
Otoscopic
Tuning fork test
Audiometry test
Vestibular function test
Audiogram
Lab investigation
CBC, UA, ESR, Coagulogram
VDRL, TPHA, FTA-Abs, Anti HIV,LP
Fasting blood sugar,s-electrolyte
BUN, Cr, Uric acid
Lipid profile
TFT
EKG, CXR, Film mastoid, CT, MRI
Viral study
Management
Depend on etiology
Medical Management
Bed rest,avoid noise voice,head tilt30
Low salt diet
Diuretic
Corticosteroid
Vasodilater,Carbogen(95%O2+5%CO2)
Anticoagulation etc.
Plasma explander (10%Dextran)
Acyclovia
Avoid ototoxic drugs
Combined therapy
Surgical management
Perilymph fistula
Tympanotomy -> occlude by gelfoam
Prognosis
Severity of loss
The more severe the loss, the lower the prognosis for recovery, and profound
losses have an exceptionally poor prognosis.
Audiogram shape
Upsloping and mid-frequency losses recover more frequently than downsloping
and flat losses.