Introduction to hearing implairment & cochlear implantation]
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Transcript of Introduction to hearing implairment & cochlear implantation]
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INTRODUCTION TO HEARING IMPAIRMENT AND COCHLEAR
IMPLANT
Dr. Ghulam SaqulainHead of Dept. of ENT,
Capital Hospital.
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Helen Keller
“When you lose your vision, you lose contact with things;
when you lose your hearing, you lose contact with people.”
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Patient profile and History
3 years old male childWas admitted on 2nd march 2016Resident of Azad Kashmir Normal birth with immediate cry.According to mother, hearing loss since birth, not
responding to any sound nor able to talk.There was no other congenital anomaly noted.Other milestones were normal
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Past History No medical and surgical history
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Hearing Assessment
BERA test
Profound SNHL. Hearing loss was stable. BERA was repeated at the interval of 6 months till surgery.
Right ear90 db
Left ear90 db
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MRI brain and Temporal bones
Bilateral CP angles and 7th-8th nerve complexes were normal.
The cochlear turns and vestibule were normal bilaterally
There was no other pathology noted in brain
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CT scan Brain and temporal bones.
Mastoids were well pneumatized. Middle ears on both sides were normal with intact ossicular chain. Bony cochlea and semicircular canals were also intact.
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Plan Since this was a case of profound non serviceable SNHL, Cochlear Implantation was planned
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Surgery Patient was operated for Cochlear implantation at capital Hospital on 3rd march 2016 by experienced:Implant Surgeon AudiologistOur team
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What is a Hearing Impairment?
Hearing impairment is the decreased ability to hear and discriminate among sounds.
A complete inability to hear also occurs and is quite common such that a person is unable to understand speech even in the presence of amplification.
World Health Organization (WHO) recognizes moderate, severe and profound HL as disabling hearing losses
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WHO Definition of a Disability (2000)
18
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STATISTICS AND DEMOGRAPHICS:
In United States: About 12,000 babies (3 in 1,000) are born with significant hearing impairment.
In United Kingdom:10 million people (1 in 6 of population)By 2031 set to rise to 14.5 million people It is estimated that about 50,000 - 70,000 people use sign language
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In Pakistan:
According to census report 1998, 9 % of total population is disabled
According to WHO survey, 10% of total population is suffering from one or other disability. Hearing impairment accounts for 9% of disabilities.
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Age of Presentation
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Etiology:
InfectionGenetics, Aging, Exposure to noise, Chemicals and Physical trauma.
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Breakdown of causes/risk factors
responsible for increasing burden
of hearing disability and
handicap.
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Ear comprises of three main parts playing their own vital role :
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Types of Hearing Loss:
Type Area Affected CausesConductive Middle Ear Blockage
DamageInfection
Sensorineural Inner Ear (Hair cells) or auditory nerve
Noise Drug side effectsGeneticsInfectionsAgeing
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Conductive Hearing Loss
Sound does not move into inner ear efficiently.
Due to a problem in either outer or middle ear.
May be medically or surgically treated or cured.
Inner ear works fine.
Amplification may help to get sound through the auditory system.
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< < < < <
xo xo xo o ox x xo
Conductive Hearing Loss
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Sensorineural Hearing Loss
Sound is not interpreted efficiently by inner ear. (Louder doesn’t help!)
May be due to hair cell/nerve damage.
May be due to problem with auditory nerve.
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xo<xo< xo o ox x xo
< < <
Sensorineural Hearing Loss
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HI is tip of an iceberg:
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Impact of Hearing loss
Pre Lingual Hearing Loss
Post Lingual Hearing Loss
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Post Lingual Hearing Loss:
Typically:Gradual lossDetected by family
On the one hand, they are fortunate in that they have learned to speak.
On the other hand, they suffer from social isolation.
When the loss is due to heredity causes, total deafness is often the end result.
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Pre lingual Hearing Loss:
Depends On: Ear/s involvedDegree /LevelType of hearing loss Age of onset
Mild Hearing Loss: May affects
Speech perception in noise esp. in classroom environment a mild hearing loss is disabling
Behavioral Emotional or social problems
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Severe Losses:
Children do not speaking at a normal age Delayed language acquisition; Lack of reaction to loud noises Disordered speech Ignore adults when spoken to
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A child who sustains hearing loss early in life may lack the language stimulation and speech development experienced by children who can hear.
Hearing loss stunts imitation of essential speech patterns and sounds, and prevents the individual from monitoring his or her errors.
The academic progress of a child with hearing loss often lags behind that of children who can hear.
It is common for hearing-impaired adolescents to be four or more grades behind their peers.
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Infant Screening:
Screening of neonates, preferably before they leave the hospital is recommended and is essential component of UNHS programs
UNHS
This is because language and communication develop rapidly during the first two to three years of life, and undetected hearing impairment can lead to delays in developing these skills.
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MANAGEMENT
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Mild hearing loss Lip readingHearing aid
Moderate hearing loss Lip reading Sign languageHearing Aid
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Severe hearing loss Difficulty even with a hearing aid. Most will lip read and some will use sign language
Profound hearing loss Hearing aids are of little benefit. Most will lip read Cochlear Implantation
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Cochlear Implant
A cochlear implant is a small electronic device that provides sound to children and adults who have a severe to profound hearing loss, non serviceable ears (70 to 90 dB) who do not benefit from hearing aids.
Cochlear implants enable sound to reach the brain by effectively bypassing the part of the ear which is damaged, to directly stimulate the hearing nerve electronically.
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Who is a Candidate for a Cochlear Implant?
Adults (18 years+)•Severe-to-profound, bilateral sensorineural hearing loss•Less than 50% speech recognition with hearing aids on open-set sentence recognition
Children (12 months - 2 years)•Profound, bilateral sensorineural deafness (> 90 dB HL)•Little or no benefit from hearing aids
Children (2 years - 17 years)•Severe-to-profound, bilateral sensorineural deafness •Little or no benefit from hearing aids
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Cochlear Implant Three Parts
Receiver- surgically implanted beneath the skin above the ear. A small wire containing an array of electrodes is threaded through the cochlea.
Microphone-part of the “headpiece” that rest on the outer side of the skin that covers the internal receiver. The microphone picks up sound and transmits it to the speech processor.
Speech Processor-a microcomputer that can be worn behind the ear that transmits the signal to the receiver and electrodes, which then stimulates the auditory nerve fibers, which in transmits the signal to the brain where sound is interpreted.
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How is a Cochlear Implant Different From a Hearing Aid
Hearing Aid Cochlear ImplantAcoustically amplify sound. Convert sound into electrical
signals.
Rely on the responsiveness of healthy inner ear sensory cells.
Bypass the inner ear sensory cells and stimulate the hearing nerve directly.
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Cochlear Implant Surgery
Operation lasts about 1-2 hours It’s a team approach Performed by otologist Audiologist check the activity of implant peroperatively Speech language pathologist Psychiatrist and psychologist
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Pediatric Cochlear Implant Candidacy
Audiologic Evaluation
Medical Evaluation
Speech Language Evaluation
Psychological Evaluation
Educational Evaluation
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Bilateral Cochlear Implants
Bilateral Implants Simultaneous or sequential Benefits:
Improved directionality Improved listening in noise Clarity of speech
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Possible Positive Effects of Cochlear Implant
Many CI users are able to detect medium to loud sounds including speech sounds and can learn to recognize familiar sounds.
Many CI users find it easier to communicate. More than 50% are able to understand speech without visual cues.
In clinical studies of adults who experienced hearing loss after they had developed speech, 90% reported improved communication without speech reading.
75% reported communicating more effectively when at a dinner party, when driving a car, with family members, with family and when ordering at a restaurant.
Some can talk on a telephone and enjoy music.
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Factors Thought to Influence Cochlear implant Success
Length of time the person was deaf before implantation Length of time the implant was utilized Language and Listening skills before implantation Cognitive and attention abilities Intensity of therapy after implantation Type of language programming Resources and involvement of patient’s family
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Deaf Culture and Cochlear implant
The Deaf culture is a group of individuals, generally born-deaf, and who communicate with American Sign Language (ASL).
Deaf culture celebrate their deafness, and many, if given the opportunity to hear, would choose to remain deaf because they do not see deafness as a disease or a disability, only as a difference.
If all deaf-born infants are implanted and choose the hearing world, then it will be the demise of a culture
They maintain that hearing parents’ decision to implant deaf children without consulting the Deaf community renders the decision “ill-informed, ill-prepared, ill-advised, ill-founded, and ill-fated.
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Team Approach
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Parent Commitment
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Summary
Cochlear implants are an effective treatment for severe-to-profound sensorineural hearing loss.
A multi-disciplinary approach is necessary when determining cochlear implant candidacy in children.
Post-operative management of a child with a cochlear implant consists of programming of the sound processor and important rehabilitation.
Parent commitment and school support are necessary components to ensure a child’s success with a cochlear implant.
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Thank you for your AttentionAny Questions?