COR minimum response levels and auditory steady-state response thresholds in infants and children with absent auditory brain stem response

DOI 5 Citations 8 References
  • Taiji Hidenobu
    Department of Otolaryngology, National Center for Child Health and Development
  • Morimoto Noriko
    Department of Otolaryngology, National Center for Child Health and Development
  • Iigaya Nanae
    Department of Otolaryngology, National Center for Child Health and Development
  • Kawashiro Nobuko
    Department of Otolaryngology, National Center for Child Health and Development

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  • ＡＢＲ無反応の乳幼児のＣＯＲおよびＡＳＳＲ閾値についての検討

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Abstract

We investigated the distribution of behavioral hearing thresholds and auditory steady-state response (ASSR) thresholds in infants and children showing no click-evoked auditory brain stem responses (ABRs) at 105dBnHL. The conditioned orientation response (COR) thresholds in 28 infants and children aged 9 to 32 months showing no click-ABR varied from 58 to 113dB HL in the speech frequency range. 32% of the subjects had aided COR thresholds at levels <60dB HL. These results indicate that absent ABR does not rule out useful residual hearing. Therefore, ASSR testing was carried out in 19 infants and children with absent ABR. ASSR thresholds were present in 87% of the ears at 1000Hz even when click=ABRs were absent. The ASSR technique may quantify hearing losses in the severe to profound range, and indicate some amount of residual hearing.

Journal

  • AUDIOLOGY JAPAN

    AUDIOLOGY JAPAN 50 (2), 101-106, 2007

    Japan Audiological Society

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