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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 e-mail: [email protected] 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) 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 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 Pg. 16 Pgs. 40-42