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KMID : 0858620050090020156
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Korean Journal of Audiology
2005 Volume.9 No. 2 p.156 ~ p.160
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Analysis on the Usage of Cochlear Implants and Hearing Aids in Schools of Special Education for the Hearing Impaired Located in Seoul and Incheon Metropolitan Areas
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Yang Han-Suk
Song Jung-Hwan
Oh Jae-Joon
Lee Soo-Kyeong
Yoo Hyun-Jung
Ki You-Jung
Lee Yoon-Hye
Lim Su-Mi
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Abstract
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This paper examined the usage of cochlear implants and hearing aids among students in four schools of special education for the hearing impaired in Seoul (3) and Incheon (1) metropolitan areas. Each school provided with preschool, elementary school, middle school and high school programs and the data included 467 students (male：271, female：196) who participated in the study between March 2004 and February 2005 with special reference to unaided/aided hearing thresholds and proportions of device manufacturers. Unaided hearing thresholds were measured with pure tones in the closed acoustic system and aided hearing thresholds were obtained under FM warble tone stimulation in the sound field system with the speaker and subject angle of 45°and with the separation distance of one meter. Hearing aid wearers were tested for both unaided and aided hearing thresholds while cochlear implants were examined for aided hearing thresholds only. The proportions of device manufacturers in cochlear implants and hearing aids were surveyed with the tested students or their parents. Results showed the highest percentage (58.6%) of monaural cochlear implant usage and 8.6 percent of binaural hearing aid usage among various combinations in preschool programs. The highest percentage (41.0%) of students in elementary school programs wore binaural hearing aids and 29.0 percent of them wore monaural hearing aids. In the middle and high school programs, 35.5 percent of students wore monaural hearing aids and 31.0 percent of them benefited from binaural hearing aids. The average unaided hearing threshold of the total tested subjects was about 100 dBHL. The average aided hearing thresholds of hearing aid users was about 53 dBHL while that of cochlear implants was about 36 dBHL. The highest percentage (61.3 %) of the cochlear implants were examined with the devices of Nucleus while 27.3 percent of them with products of Advanced Bionics, and 11.3 percent of them with products of MED-EL. The highest percentage (56.7%) of the hearing aid users wore Oticon devices while the second and third percentage ones included products of Siemens and Starkey, respectively.
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KEYWORD
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Cochlear implant, Hearing aid
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