Findings of Acoustic Stapedial Reflex Test in Newborns with and without Risk Factor

Abstract

Objectives: The aim of this study was to determine the rates of acoustic stapedial reflexes (ASR) presence and to assess the test­­-retest reliability of ASR at a 1000 Hz probe tone in newborns with and without risk factor. Materials and Methods: Screening Transient Evoked Otoacoustic Emission (TEOAE), Automated Auditory Brainstem Response (AABR), tympanometry and ASR tests were performed on 59 ears with risk factor (research group) and 44 ears without risk factor (control group) within 0 ‒ 2 weeks following birth. Afterwards, tympanometry and ASRs were repeated one month later. Results: In terms of ASR thresholds, there is no significant difference between the two groups (p>0.05). Detection rates of ipsilateral ASRs were higher than those of contralateral ASRs in the first assessment for both group. Conclusion: Ipsilateral ASRs in neonates can be obtained in the early postnatal period, but contralateral ASRs can be detected late, especially one month after birth. ASR is an essential diagnostic test battery in newborns because it gives clinicians more information about the entire hearing system.    

Keywords

• acoustic reflex,newborn,risk factor

References

1. Sutton, G. J. (2007). Usefulness of acoustic reflexes still unproven in newborns and young infants. Journal of the American Academy of Audiology, 18(2), 187-189.
2. Swanepoel, D. W., Werner, S., Hugo, R., Louw, B., Owen, R., Swanepoel, A. (2007). High frequency immittance for neonates: a normative study. Acta Oto-Laryngologica, 127, 49-56.
3. Kei, J. (2012). Acoustic stapedial reflexes in healthy neonates: Normative data and test-retest reliability. Journal of the American Academy of Audiology, 23, 46-56.