AudiometrictestSpeechaudiometry----ability to hear and understandspeechspeech reception thresholdspeechdiscrimination score
Audiometric test ◼ Speech audiometry ◼ -ability to hear and understand speech ① speech reception threshold ② speech discrimination score
ImpedanceaudiometryAbjectivetestUseful for childrenBe consist of TympanomtryTympanogram( A As Ad B C)Acoustic reflex measurementPhysical volume of ear canal
Impedance audiometry ◼ Abjective test ◼ Useful for children ◼ Be consist of Tympanomtry Tympanogram( A As Ad B C) ◼ Acoustic reflex measurement ◼ Physical volume of ear canal
Evoked response audiometryAbjectivetestTheresponseto auditory stimuliDependon specialequipmentUseful for childrenBeconsistof1.Electrocochleography(EcoG.)cochleal microphonic,summating potential,actionpential2.OtoacousticEmissions(OAEs)SpontaneousOAEandEvokedOAE(transientevokedOAE,distortionproductOAE)3.Audiotorybraimstemresponse(ABR)
Evoked response audiometry ◼ Abjective test ◼ The response to auditory stimuli ◼ Depend on special equipment ◼ Useful for children ◼ Be consist of 1. Electrocochleography(EcoG.) cochleal microphonic, summating potential, action pential 2.Otoacoustic Emissions(OAEs) Spontaneous OAE and Evoked OAE (transient evoked OAE, distortion product OAE) 3.Audiotory braimstem response( ABR)
DisorderDisorder of hearing system-hearing lossDisorder of vestibularsystem-vertigo
Disorder ◼ Disorder of hearing system—hearing loss ◼ Disorder of vestibular system—vertigo
Classification of Hearing LossHearing lossOrganicNon-organicConductiveSensorineuralSeneory(cochlear)neuralPeriheral.(VIIInerve)Central(centralauditorypathways)
Classification of Hearing Loss Hearing loss Organic Non-organic Conductive Sensorineural Seneory (cochlear) neural Periheral (VIII nerve) Central (central auditory pathways)