ENT for the PA-C, Apr 2012 Pediatric Hearing Loss and Testing Techniques Diego A Preciado MD PhD...
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Transcript of ENT for the PA-C, Apr 2012 Pediatric Hearing Loss and Testing Techniques Diego A Preciado MD PhD...
![Page 1: ENT for the PA-C, Apr 2012 Pediatric Hearing Loss and Testing Techniques Diego A Preciado MD PhD Pediatric Otolaryngology Childrens National Medical Center.](https://reader033.fdocuments.in/reader033/viewer/2022061305/55143d24550346414e8b476e/html5/thumbnails/1.jpg)
ENT for the PA-C, Apr 2012
Pediatric Hearing LossPediatric Hearing Lossand Testing Techniquesand Testing Techniques
Diego A Preciado MD PhDPediatric Otolaryngology
Children’s National Medical CenterGeorge Washington University
Washington, DC
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ENT for the PA-C, Apr 2012
• 11 month child seems to ‘hear well’ at home, but daycare provider concerned with ability to respond to verbal stimuli at times
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A) Child can only be tested asleepB) Child can be tested awakeC) Child can only be screened for hearing loss
at his ageD) Child can only be tested by the old
‘rub/snap your fingers’ next to the ear trick
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ENT for the PA-C, Apr 2012
Childhood Hearing Loss
Moderate to profound congenital hearing impairment occurs in 4 per 1000 live births
Recommendations specify thatAll children screened at birthAll children diagnosed by 3 months of ageAll children treated by 6 months
43 states have mandated Universal Newborn Hearing Screening (UNHS) programs
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ENT for the PA-C, Apr 2012
Types of Hearing Tests
• Screening (PASS OR FAIL) (electrophysiological)– Otoacoustic Emissions (OAE)– Automated ABR
• Diagnostic (NOT PASS OR FAIL)– ABR (electrophysiological; all ages)– Pure Tone Audiometry (>4 yrs of age)– Infant Audiometry (>6 mo of age)
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Here’s the clinical challenge we are faced with…..
UNHSInfantswith HL
0 6 12 18
OptimalAge for CI
TargetAge
Languagebehaviors
age inmonths
ENT
HA, Rehab, SLP
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Electrophysiologic Testing
• Use in neonates, uncooperative patients, brain injury
• Otoacoustic emissions (OAEs)• Originates in cochlea, evoked with sound
stimulation• Absent suggests > 30 dB HL
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ENT for the PA-C, Apr 2012
Electrophysiologic Testing
• Evoked auditory brainstem response (ABR or BAER)
• Auditory electrical responses• Diagnoses presence, degree and type of
HL
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ENT for the PA-C, Apr 2012
Hearing Loss Types
•Conductive–measured by “air” stimulation on audiogram
•Sensorineural–measured by “bone” stimulation on audiogram
•Mixed
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ENT for the PA-C, Apr 2012
Conductive Loss
• Conductive loss (CHL) results from increase in impedance (resistance)
• Audiometric profile of conductive hearing loss is threshold for air conduction is worse than for bone conduction i.e. large “air-bone gap”
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ENT for the PA-C, Apr 2012
Conductive Hearing Loss• Generally reversible• Middle or External Ear Pathology• External auditory canal (EAC) obstruction
Cerumen impactions, foreign body, otitis externa, EAC atresia
• Abnormality of ear drum Perforation, retraction
• ME conditions AOM, OM with effusion, cholesteatoma, tumor
• Ossicular chain anomalies Disruption - associated with trauma Fixation – often congenital
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ENT for the PA-C, Apr 2012
Tympanometry
• Not a hearing test!• Objective measure of middle ear (ME)
compliance• Complements ear exam
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TympanogramsCO
MPL
IAN
CE/A
dmita
nce
Volu
me
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ENT for the PA-C, Apr 2012
Tympanograms
Type A- Normal
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ENT for the PA-C, Apr 2012
Tympanograms
Type B- High VolumePerforation or PE tube
Type B- Low VolumeFluid
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ENT for the PA-C, Apr 2012
Tympanograms
Type C- Negative PressureRetraction
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ENT for the PA-C, Apr 2012
Sensorineural Loss
• Sensorineural hearing loss (SNHL) results because of lesions in the auditory nerves and/or cochlea
• Audiometric profile of sensorineural hearing loss demonstrates air conduction and bone conduction reduced without an air-bone gap
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ENT for the PA-C, Apr 2012
Etiology of SNHL
70% recessive25% dominant5% X-linked
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ENT for the PA-C, Apr 2012
SNHL – Associated Conditions
• Usually irreversible• Family history –
congenital, delayed onset childhood SNHL
• Congential infections – CMV, rubella
• Bacterial meningitis
• Loop diuretics, aminoglycosides, aspirin
• Hyperbilirubinemia• Severe depression at
birth (asphyxia)• Anomalies of
external and middle ear
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ENT for the PA-C, Apr 2012
Mixed Hearing Loss
• Mixed hearing loss results from BOTH a conductive and sensorineural hearing loss
• Audiometric profile shows a drop in air and bone conduction with an air-bone gap
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ENT for the PA-C, Apr 2012
Audiogram
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ENT for the PA-C, Apr 2012
Behavioral Audiometry
Test Techniques: • Behavioral Observation Audiometry (BOA)
• Visual reinforcement audiometry (VRA)
• Conditioned play audiometry (CPA)
• Conventional hand-raising procedures
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ENT for the PA-C, Apr 2012
Behavioral Observation Audiometry
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ENT for the PA-C, Apr 2012
Behavioral Observation Audiometry (BOA)
• Children aged ~5 months to 2 years– Individuals with
neurological/developmental involvements• Primarily sound field testing• Subjective observation by the clinician• Stimuli may include speech, warble tones,
narrowband noise (NBN), parent’s voice
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ENT for the PA-C, Apr 2012
Audiometry during infancy
SS
S S
Age-appropriate responses for infants aged ~5 – 9 months
Speech = 20
NBN or warbled tones = 20-50
SymbolsSound field
S
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ENT for the PA-C, Apr 2012
Visual reinforcement audiometry (VRA)
Employs lighted transparent-boxed toys to reinforce
child’s localized response to onset of acoustic stimuli
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ENT for the PA-C, Apr 2012
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ENT for the PA-C, Apr 2012
Visual reinforcement audiometry (VRA)
• Children aged 6 mo - ~ 3 years• Technique consists of conditioning & testing
phases• Responses may include localizations or BOA
responses• Disadvantages
– Dependent on conditioning child to task– Habituation to acoustic stimuli – Poor test reliability
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ENT for the PA-C, Apr 2012
Conditioned Play Audiometry (CPA)
Child is taught a play task in response to
the onset of an acoustic stimulus
Children aged ~ 2-2.5 - 5 years
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ENT for the PA-C, Apr 2012
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ENT for the PA-C, Apr 2012
Audiometry
• Conventional audiometry: ≥ 5 yrs• Zero-20 dB is normal range• Not absolute, but normalized scale• Hearing threshold measured for air
and bone conduction in decibels from 250 Hz – 8 KHz
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Pure Tone Audiograms
‘loud
ness
’
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ENT for the PA-C, Apr 2012
AudiogramsBracket = Bone, Right Side Circle = Air, Right Side
NORMAL
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ENT for the PA-C, Apr 2012
AudiogramsBracket = Bone, Right Side Circle = Air, Right Side
CHL A-B gap
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ENT for the PA-C, Apr 2012
AudiogramsBracket = Bone, Right Side Circle = Air, Right Side
SNHL
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ENT for the PA-C, Apr 2012
AudiogramsBracket = Bone, Right Side Circle = Air, Right Side
MIXED HL
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A 3 year old child presents with low volume, Type B tympanogram, and
20 dB Air Bone gap
Most likely diagnosis isA- CholesteatomaB- TM perforationC- OM with effusionD- Sensorineural hearing loss
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A 3 year old child presents with low volume, Type B tympanogram, and
20 dB Air Bone gap
Most likely diagnosis isA- CholesteatomaB- TM perforationC- OM with effusionD- Sensorineural hearing loss
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ENT for the PA-C, Apr 2012
Hereditary Hearing Impairment
• Dominant– progressive, milder, late onset,
penetrance/expressivity• Recessive
– stable, severe, congenital, more symmetric
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SYNDROMES
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ENT for the PA-C, Apr 2012
Waardenburg Syndrome• Autosomal dominant
– Variable expressivity• Associated with pigmentary abnormalities• White forelock (20-30%)• Premature graying• Vitiligo• Heterochromia irdis
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Treacher Collins Syndrome (Mandibulofacial Dystostosis)
• Inheritance: Autosomal dominant with variable expressivity
• Molecular basis:Caused by mutations in Treacle gene (TCOF1)
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ENT for the PA-C, Apr 2012
Branchiootorenal Syndrome
• Autosomal dominant• Branchial cleft sinuses/fistulas• Renal anomalies
– These range from mild hypoplasia to bilateral renal agenesis
• External, middle and inner ear deformities• Estimated at about 2% of childhood deafness
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ENT for the PA-C, Apr 2012
Autosomal Recessive Syndromes
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ENT for the PA-C, Apr 2012
Pendred Syndrome
• Autosomal recessive • Abnormal incorporation of iodine• Perchlorate or thiocyanate tests are rarely
performed• Goiter and hypothyroidism usually present
by about 8 years of age
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ENT for the PA-C, Apr 2012
Pendred Syndrome
• Associated with enlarged vestibular aqueduct• Histologic evidence of hydrops and
degenerated changes of the stria vascularis have been described
• Treatment – – amplification– exogenous thyroid hormone
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ENT for the PA-C, Apr 2012
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ENT for the PA-C, Apr 2012
Usher’s Syndrome
• Usher’s Syndrome Type I (7 loci-MYO7A)– Autosomal recessive– Severe to profound hearing loss– Absence of vestibular response– Slow progression– Slowly progressive visual field deficits beginning
as early as age 9-10
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ENT for the PA-C, Apr 2012
Jervell and Lange-Nielson
• Autosomal recessive– Severe-to-profound Bilateral
• Cardiac conduction defects– Enlarged T-waves– Prolongation of the Q-T interval– Syncopal episodes– Sudden death
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ENT for the PA-C, Apr 2012
Clinical Genetics
• Not all that is genetic is a syndrome…
• Malformation: morphologic defect of an organ, part of organ resulting from an intrinsically abnormal developmental process
• Sequence: multiple defects from a single defect
• Syndrome: pattern of multiple anomalies pathogenetically related
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ENT for the PA-C, Apr 2012
Connexin 26
• Mutations in GJB2 (DFNB1) reported at ~30% (20%-70%) of severe to profound hearing loss
• Carrier rate-3.0% (Caucasian)• 35delG, M34T -Caucasian
167delT-Ashkenazi Jewish 235delC-Japanese
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ENT for the PA-C, Apr 2012
Connexin 26
GJB2
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ENT for the PA-C, Apr 2012
EVA
• Sensorineural Hearing Loss• Low Frequency Conductive Hearing Loss
Component• Usually stable hearing level• Occasionally Progressive• Although a congenital malformation of the
inner ear, frequently a later onset hearing loss
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ENT for the PA-C, Apr 2012
EVA
• Syndromic– Associated with SLC26A4 mutation (DFNB4) – Pendred’s– More severe phenotype
• Non-syndromic– More heterogenous hearing level
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ENT for the PA-C, Apr 2012
VA Size
Boston M, et al. Oto-HNS, 2007
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SLC26A4 mutations and hearing loss
Asaiez H, et al. Human Genetics, 2007
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ENT for the PA-C, Apr 2012
Clinical Evaluation
• History and Physical• Syndromic findings
– Cutaneous, musculoskeletal, visceral (cardiac, thyroid, renal, visual/balance, cervical)
• Neonatal risk factors• Others-noise, head trauma, autoimmune,
Meniere’s, Lues• Extended family history
– pedigree
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ENT for the PA-C, Apr 2012
Clinical Evaluation
• Audiometric evaluation-Diagnosis– Behavioral– ABR
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ENT for the PA-C, Apr 2012
ResultsGJB2 and Imaging yield vs.
SNHL
0.0%
10.0%
20.0%
30.0%
40.0%
50.0%
bilateralsev-to-prof
bilateralmod-sev
bilateralmild-to-mod
unilateral
CT Scan
GJB2
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GJB2 screen
+
CT scan
+_ _
Genetic Counseling
CT scan GJB2 screen
Lab tests as indicated
Lab tests as indicated
ECG
History, Physical examination, Audiologic work-up
Diagnosis uncertain
Bilateral Unilateral
MRI, Preferential seating,Serial audiograms
Appropriate treatment
Diagnosis apparent
Sev-to-Prof Mod-Sev Mild-to-Mod
Appropriate treatment
Preciado D, et al. Otol Neurotol. 2005 Jul;26(4):610-5
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ENT for the PA-C, Apr 2012
Conclusions
• You can screen or diagnose AT ANY AGE!• Screen for HL at birth, diagnose by 3 months• You can test awake starting at 6 months• Follow a logical sequential diagnostic work-up
paradigm based on history and physical• Laboratory investigation should be based on
these results and on clinical history
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