+Figure15.1(A)Normalcochlearduct.(B)CochlearductisdistendedwithendolymphpushingtheReissner'smembraneintoscalavestibuli?
Aetiology1.Defectiveabsorptionbyendolymphaticsao2.Vasomotordisturbance3.Allergy4.Sodiumandwaterretention5.Hypothyroidism6.Autoimmuneandviral aetiologies
Aetiology 1. Defective absorption by endolymphatic sac 2. Vasomotor disturbance 3 . Allergy 4 . Sodium and water retention 5. Hypothyroidism 6. Autoimmune and viral aetiologies
Clinical FeaturesRecurringepisodeofVertigovertigoisusuallysuddenwithoutlossofconsciousnessoCompaniedwithnauseavomitingandnystagmusPersistfor2Omintoseveralhours
Clinical Features 1. Recurring episode of Vertigo vertigo is usually sudden – without loss of consciousness ◦ Companied with nausea vomiting and nystagmus ◦ Persist for 20min to several hours
EveEeNe& Thsut HospitaCharta#83fenyangRoadwedbday0ceoter20.20041025200032377134-545TL2.FluctuatingHearinglossRR字58R#乐8号PTAEarlyfluctuationoflowfrequenceyhearingloss andlaterinvolvementofthehighChanttfrequencies.EAneventual declineover5-10yearsand subsequentstabilizationwithaflat国共品零品moderatetoseverehearingloss
2. Fluctuating Hearing loss PTA – Early fluctuation of low frequencey hearing loss and later involvement of the high frequencies. – An eventual decline over 5-10 years and subsequent stabilization with a flat moderate to severe hearing loss