Author: Dr. Sam Slike Bloomsburg University of Pennsylvania Date submitted to deafed.net – February 7, 2006 To contact the author for permission to use this PowerPoint, please To use this PowerPoint presentation in its entirety, please give credit to the author.

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) Encephalitis (pg. 18) Bacterial Infection (pg. 19) Meningitis (pg. 33)

Etiology (cont.) Diseases (cont.) Typhoid Fever (pg. 20) Rh Incompatibility (pg. 21) Cytomegalovirus (CMV) (pg. 37)

Etiology (cont.) Heredity Consanguinity (pg. 22) Marriages of the Deaf Waardenbergs Syndrome (pg. 36)

Etiology (cont.) Accidents Premature Birth Noise Exposure

Severity of Hearing Loss Mild 2040 dB Moderate4060 dB Severe6080 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 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 (operators 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

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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 Pg. 16 Pgs