摘要:

Ipsilateral and contralateral auditory brain stem responses (ABR) were recorded in 10 full-term neonates. We investigated the effect of the masking level on the peak latency and amplitude on ipsi- and contralateral recordings. Clicks were presented at 85 dB HL to the ipsilateral ear and the masking white noise was presented at 75, 65, 55, 45 and 0 dB HL on the contralateral one, respectively. Masking had no significant effect on the ipsi- and contralateral recording in regard to latency and amplitude except for wave CVI (contralateral wave VI). In addition, ABR was recorded in an infant with total unilateral hearing loss. Crossover responses on both sides were observed without contralateral masking, but these responses were completely eliminated when 45 dB HL contralateral masking masked the 85 dB HL clicks to the dead ear. Therefore, it is suggested that such crossover responses will contribute to the ipsi- and contralaterally recorded ABR waveform when an ABR recording is carried out without contralateral masking. Our results indicate that contralateral masking is necessary and should be used in cases of unilateral hearing loss.

ISSN:0196-0202    

出版商:OVID    

年代:1990

数据来源: OVID

摘要:

A survey of vocational/technical schools in Massachusetts was performed to evaluate the prevalence of and need for hearing conservation programs. The surveys were sent to the superintendents or principals of all 27 regional schools in Massachusetts. Surveys consisted of questions in the areas of shop noise exposure, use of safety equipment, and hearing conservation education. Results indicate that (1) many teachers and students may be exposed to hazardous noise levels (2) hearing protection is not required in one-third of the schools and is used less frequently than other safety equipment, and (3) teachers desire additional training in hearing conservation and would welcome the assistance of an audiologist. These results point out the need for obtaining measurements of noise levels in the school shops, designing hearing conservation programs for school settings, implementing mandatory use of hearing protection, and providing education in hearing conservation for students and teachers.

ISSN:0196-0202    

出版商:OVID    

年代:1990

数据来源: OVID

ISSN:0196-0202    

出版商:OVID    

年代:1990

数据来源: OVID

ISSN:0196-0202    

出版商:OVID    

年代:1990

数据来源: OVID

ISSN:0196-0202    

出版商:OVID    

年代:1990

数据来源: OVID

ISSN:0196-0202    

出版商:OVID    

年代:1990

数据来源: OVID