Acoustic Reflex Testing in Neonatal Hearing Screening and Subsequent Audiological Evaluation Purpose The aims of the study were to examine the acoustic reflex screening and threshold in healthy neonates and those at risk of hearing loss and to determine the effect of birth weight and gestational age on acoustic stapedial reflex (ASR). Method We assessed 18 healthy neonates (Group ... Research Article
Research Article  |   July 13, 2018
Acoustic Reflex Testing in Neonatal Hearing Screening and Subsequent Audiological Evaluation
 
Author Affiliations & Notes
  • Lilian Cássia Bórnia Jacob-Corteletti
    Department of Audiology and Speech Pathology, Bauru Dental School, University of São Paulo, Brazil.
  • Eliene Silva Araújo
    Department of Audiology and Speech Pathology, Federal University of Rio Grande do Norte, Natal, Brazil
  • Josilene Luciene Duarte
    Department of Audiology and Speech Pathology, Federal University of Sergipe, Lagarto, Brazil
  • Fernanda Zucki
    Department of Audiology and Speech Pathology, Federal University of Santa Catarina, Florianópolis, Brazil
  • Kátia de Freitas Alvarenga
    Department of Audiology and Speech Pathology, Bauru Dental School, University of São Paulo, Brazil.
  • Disclosure: The authors have declared that no competing interests existed at the time of publication.
    Disclosure: The authors have declared that no competing interests existed at the time of publication. ×
  • Correspondence to Lilian Cassia Bornia Jacob-Corteletti: lilianjacob@fob.usp.br
  • Editor: Frederick (Erick) Gallun
    Editor: Frederick (Erick) Gallun×
  • Associate Editor: Todd Ricketts
    Associate Editor: Todd Ricketts×
Article Information
Hearing & Speech Perception / Hearing Disorders / Special Populations / Early Identification & Intervention / Hearing / Research Articles
Research Article   |   July 13, 2018
Acoustic Reflex Testing in Neonatal Hearing Screening and Subsequent Audiological Evaluation
Journal of Speech, Language, and Hearing Research, July 2018, Vol. 61, 1784-1793. doi:10.1044/2018_JSLHR-H-16-0291
History: Received July 16, 2016 , Revised December 22, 2016 , Accepted February 16, 2018
 
Journal of Speech, Language, and Hearing Research, July 2018, Vol. 61, 1784-1793. doi:10.1044/2018_JSLHR-H-16-0291
History: Received July 16, 2016; Revised December 22, 2016; Accepted February 16, 2018

Purpose The aims of the study were to examine the acoustic reflex screening and threshold in healthy neonates and those at risk of hearing loss and to determine the effect of birth weight and gestational age on acoustic stapedial reflex (ASR).

Method We assessed 18 healthy neonates (Group I) and 16 with at least 1 risk factor for hearing loss (Group II); all of them passed the transient evoked otoacoustic emission test that assessed neonatal hearing. The test battery included an acoustic reflex screening with activators of 0.5, 1, 2, and 4 kHz and broadband noise and an acoustic reflex threshold test with all of them, except for the broadband noise activator.

Results In the evaluated neonates, the main risk factors were the gestational age at birth and a low birth weight; hence, these were further analyzed. The lower the gestational age at birth and birth weight, the less likely that an acoustic reflex would be elicited by pure-tone activators. This effect was significant at the frequencies of 0.5, 1, and 2 kHz for gestational age at birth and at the frequencies of 1 and 2 kHz for birth weight. When the broadband noise stimulus was used, a response was elicited in all neonates in both groups. When the pure-tone stimulus was used, the Group II showed the highest acoustic reflex thresholds and the highest percentage of cases with an absent ASR. The ASR threshold varied from 50 to 100 dB HL in both groups. Group II presented higher mean ASR thresholds than Group I, this difference being significant at frequencies of 1, 2, and 4 kHz.

Conclusions Birth weight and gestational age at birth were related to the elicitation of the acoustic reflex. Neonates with these risk factors for hearing impairment were less likely to exhibit the acoustic reflex and had higher thresholds.

Acknowledgments
This research was supported by a grant from the National Council for Scientific and Technological Development (CNPq-Brazil 308934/2007-5, awarded to Lilian C. B. Jacob-Corteletti).
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