Efferent inhibition of otoacoustic emissions in preterm neonates

Carvallo, Renata Mota Mamede; Sanches, Seisse Gabriela Gandolfi; Ibidi, Silvia Maria; Soares, Jordana Costa; Durante, Alessandra Spada

doi:10.1016/j.bjorl.2015.07.008

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Brazilian Journal of Otorhinolaryngology

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ORIGINAL ARTICLES • Braz. j. otorhinolaryngol. 81 (5) • Sep-Oct 2015 • https://doi.org/10.1016/j.bjorl.2015.07.008 copy

Efferent inhibition of otoacoustic emissions in preterm neonates^☆ ☆ Please cite this article as: Carvallo RMM, Sanches SGG, Ibidi SM, Soares JC, Durante AS. Efferent inhibition of otoacoustic emissions in preterm neonates. Braz J Otorhinolaryngol. 2015;81:491-497.

Authorship SCIMAGO INSTITUTIONS RANKINGS

ABSTRACT

INTRODUCTION:

Abnormalities in auditory function of newborns may occur not only because of preterm birth, but also from the use of medications and from diseases related to prematurity.

OBJECTIVE:

To analyze the inhibitory effect from stimulation of the olivocochlear efferent system on transient evoked otoacoustic emissions in preterm neonates, comparing these data with those from full-term neonates.

METHODS:

This was a prospective, cross-sectional, contemporary cohort study with 125 neonates, pooled into two groups: full-term (72 full-term neonates, 36 females and 36 males, born at 37-41 weeks of gestational age); and preterm (53 neonates, 28 males and 25 females, born at ≤36 weeks of gestational age, evaluated at the corrected gestational age of 37-41 weeks). Otoacoustic emissions were recorded using linear and nonlinear click-evoked stimuli, with and without contralateral stimulation.

RESULTS:

The inhibitory effect of the efferent pathway in otoacoustic emissions was different (p = 0.012) between groups, and a mean reduction of 1.48 dB SPL in full-term births and of 1.02 dB SPL in preterm births was observed for the non-linear click-evoked stimulus.

CONCLUSION:

The results suggest a reduced inhibitory effect of the olivocochlear efferent system on otoacoustic emissions in preterm neonates.

Keywords:
Premature infant; Hearing; Newborn infant; Spontaneous otoacoustic emissions; Auditory pathways

	Mean	Median	Standard deviation	Minimum	Maximum	n	95% CI
Full-term – Male
Right
Non-linear	1.58	1.50	1.69	-0.9	6.5	36	1.0–2.1
Linear	0.56	0.50	0.68	-1.4	2.2	36	0.3–0.7
Left
Non-linear	1.19	1.10	1.19	-1.3	4.2	36	0.8–1.6
Linear	0.81	0.60	1.03	-2.0	4.0	36	0.5–1.2

Full-term – Female
Right
Non-linear	1.76	0.90	2.19	-1.3	11.0	36.0	1.0–2.5
Linear	0.77	0.50	0.92	-0.3	4.2	36.0	0.5–1.1
Left
Non-linear	1.38	1.50	0.92	-1.0	3.0	36.0	1.1–1.7
Linear	0.66	0.50	0.85	-0.4	4.3	36.0	0.4–0.9

	Mean	Median	Standard deviation	Minimum	Maximum	n	95% CI
Full-term – Male
Right
Non-linear	1.02	0.75	1.15	-1.4	3.7	24.0	0.6–1.5
Linear	0.51	0.40	0.49	-0.2	1.9	24.0	0.3–0.7
Left
Non-linear	0.96	0.90	1.29	-2.2	4.3	24.0	0.4–1.5
Linear	0.81	0.60	0.70	0.0	2.5	22.0	0.5–1.1

Full-term – Female
Right
Non-linear	1.34	0.90	1.30	-0.4	4.0	28.0	0.9–1.8
Linear	0.53	0.30	0.68	-0.3	2.8	27.0	0.3–0.8
Left
Non-linear	0.75	0.80	0.93	-1.2	3.9	28.0	0.4–1.1
Linear	0.51	0.30	1.06	-0.4	5.1	27.0	0.1–0.9

Associação Brasileira de Otorrinolaringologia e Cirurgia Cérvico-Facial. Sede da Associação Brasileira de Otorrinolaringologia e Cirurgia Cérvico Facial, Av. Indianópolia, 1287, 04063-002 São Paulo/SP Brasil, Tel.: (0xx11) 5053-7500, Fax: (0xx11) 5053-7512 - São Paulo - SP - Brazil
E-mail: revista@aborlccf.org.br

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[1] * Corresponding author. E-mail:renamaca@usp.br (R.M.M. Carvallo).

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Efferent inhibition of otoacoustic emissions in preterm neonates☆ ☆ Please cite this article as: Carvallo RMM, Sanches SGG, Ibidi SM, Soares JC, Durante AS. Efferent inhibition of otoacoustic emissions in preterm neonates. Braz J Otorhinolaryngol. 2015;81:491-497.

ABSTRACT

INTRODUCTION:

OBJECTIVE:

METHODS:

RESULTS:

CONCLUSION:

Efferent inhibition of otoacoustic emissions in preterm neonates^☆ ☆ Please cite this article as: Carvallo RMM, Sanches SGG, Ibidi SM, Soares JC, Durante AS. Efferent inhibition of otoacoustic emissions in preterm neonates. Braz J Otorhinolaryngol. 2015;81:491-497.