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The Deaf child Dr Manas 1 |
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Definition The child with profound hearing loss(>90dB) or total deafness fail to develop speech and have termed as deaf-mute or deaf & dumb. 2 |
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Aetiology Prenatal causes
Perinatal causes
Postnatal causes 3 |
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Prenatal causes Genetic defect
Michel aplasia (complete failure)
Mondini aplasia (cochlea 1 &1/2 turn)
Schiebe aplasia (abnormal membranous cochlea and saccules - commonest)
Alexander aplasia (affect basal turn of cochlea)
Maternal infection (TORCHES)
Drugs –Aminoglycosides, Thalidomide
Radiation in first trimaster of pregnency
Nutritional defic, Diabetes, Hypothyroidism 4 |
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Perinatal causes Anoxia
Prematurity
Birth injury
Neonatal jaundice
Neonatal meningitis
Ototoxic drugs 5 |
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Postnatal causes Genetic
Alport’s, Klippel-Feil, Hurler syndrome
Viral infection (Measles,Mumps, Rubella)
Secretory otitis media
Ototoxic drugs
Trauma
Noise induced deafness 6 |
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Evaluation of a deaf child Finding of cause by detail history
Assessment of hearing in infants and children 7 |
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Assessment of hearing in infants and children Screening Procedures
Arousal test
Auditory response cradle
Behaviour observation audiometry
Distraction techniques
Conditioning technique
Play audiometry
Visual reorientation audiometry
Speech audiometry 8 |
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e. Objective tests
Evolked response audiometry (Electrocochleography, BERA)
Impedence audiometry
Otoacoustic emission
Heart rate audiometry 9 |
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Management Parental guidance
Hearing aid
Development of speech and language
Auditory oral communication
Manual communication
Total communication
Education of deaf child
Vocational guidance 10 |
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Rehabilitation of the hearing impaired Instrumental devices
Hearing aids
Cochlear implants
Assistive devices
Training
Speech reading
Auditory training
Speech conservation 11 |
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Hearing aid Hearing aid is the device to amplify the sound reaching the ear. It has three parts ie. microphone, amplifier, receiver.
Two types –
Air conduction hearing aid (mostly used)
Bone conduction hearing aid 12 |
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Air conduction hearing aid Body worn type
Behind the ear type (BTE)
Spectacle type
In the ear type (ITE)
Canal type (ITC, CIC)
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Indications of hearing aid SN HL
Deaf children
Conductive deafness 14 |
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Cochlear implant External device
Microphone
Speech processor
Transmitting coil
Internal device
Receiver
Electrode array 15 |
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Assistive devices Assisting listening devices and system
Alerting devices
Telecommunication devices 18 |
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Training Speech reading
Auditory training
Speech conservation 19 |
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Thank You Thank You 20 |
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