Download FACTORS OF PRIME IMPORTANCE:

Author: Dr. Sam Slike
Bloomsburg University of Pennsylvania
 Date submitted to deafed.net – February 7,
2006
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FACTORS OF PRIME
IMPORTANCE:
Defining the Hearing Loss
of a Child
Dr. Samuel B. Slike
Age of Onset
 Congenital
 Prelingual
 Adventitious (Acquired)
 Postlingual
Etiology
 Diseases:

Rubella (pg. 17)
http://www.cdc.gov/nip/diseases/rubella/vac-chart.htm

Encephalitis (pg. 18)
http://www.mayoclinic.com/invoke.cfm?id=DS00226

Bacterial Infection (pg. 19)
http://www.drugdigest.org/DD/HC/HCIntro/0,4043,6,00.html

Meningitis (pg. 33)
http://www.meningitis.org/content.jsp
Etiology (cont.)
 Diseases (cont.)

Typhoid Fever (pg. 20)
http://www.cdc.gov/ncidod/dbmd/diseasinfo/typhoidfever_g.htm

Rh Incompatibility (pg. 21)
http://pregnancytoday.com/reference/articles/rhfactor.htm

Cytomegalovirus (CMV) (pg. 37)
http://www.cdc.gov/ncidod/diseases/cmv.htm
Etiology (cont.)
 Heredity

Consanguinity (pg. 22)
http://www.consang.net/summary/index.html


Marriages of the Deaf
Waardenberg’s Syndrome (pg. 36)
http://inst.augie.edu/~hanavan/ear/PAX3.htm
Etiology (cont.)
 Accidents
 Premature Birth
 Noise Exposure
Severity of Hearing Loss
 Mild
20—40 dB
 Moderate
40—60 dB
 Severe
60—80 dB
 Profound
80+ dB
NOTE: Speech Frequencies Indicators:
For Bone Conduction- [ red = right ear
] blue = left ear
For Air Conduction- O red = right ear
X blue = left ear
Typical Sound Levels

0 dB = Threshold of Hearing
 33 dB = Soft Whisper at 5 feet
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50 dB = Light Traffic at 100 ft (average residence)
70 dB = Fright Train at 100 ft (vacuum cleaner at 10 ft)
80 dB = Inside a Sports Car at 50 mph
90 dB = Subway Train at 20 ft
110 dB = Riveting Machine (operator’s position)
120 dB = Jet Takeoff at 200 ft (level of discomfort)
130 dB = 50 hp Siren at 100 ft (level of tickle)
140 dB = Level of Pain
Image found at: http://www.gohear.org/image/graph.gif
Location of Impairment
 External Ear
 Middle Ear
 Cochlea
 The Organ of Corti
 The Auditory Nerve
 Within the Central Nervous System
Type of Hearing Loss
 Conductive
 Sensorineural
 Mixed
Other Factors
 Audiometric Exam
 Intelligence of Child
 Age of Instigation of Education/Training
 Amount/Type of Education/Training
 Age of Fitting/Appropriateness of Hearing
Aid/Auditory Trainer
 Family Climate
High Risk Register
 See Handout
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Pg. 16
Pgs. 40-42