Auditory brainstem response in neonates: influence of
               gender and weight/gestational age ratio

Angrisani, Rosanna M. Giaffredo; Bautzer, Ana Paula D.; Matas, Carla Gentile; Azevedo, Marisa Frasson de

doi:10.1590/S0103-05822013000400012

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Revista Paulista de Pediatria

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Original Article • Rev. paul. pediatr. 31 (04) • Dec 2013 • https://doi.org/10.1590/S0103-05822013000400012 copy

Auditory brainstem response in neonates: influence of gender and weight/gestational age ratio

Potencial evocado auditivo de tronco encefálico en recién nacidos: influencia del sexo y de la relación peso y edad gestacional

Authorship SCIMAGO INSTITUTIONS RANKINGS

OBJECTIVE:

To investigate the influence of gender and weight/gestational age ratio on the Auditory Brainstem Response (ABR) in preterm (PT) and term (T) newborns.

METHODS:

176 newborns were evaluated by ABR; 88 were preterm infants - 44 females (22 small and 22 appropriate for gestational age) and 44 males (22 small and 22 appropriate for gestational age). The preterm infants were compared to 88 term infants - 44 females (22 small and 22 appropriate for gestational age) and 44 males (22 small and 22 appropriate for gestational age). All newborns had bilateral presence of transient otoacoustic emissions and type A tympanometry.

RESULTS:

No interaural differences were found. ABR response did not differentiate newborns regarding weight/gestational age in males and females. Term newborn females showed statistically shorter absolute latencies (except on wave I) than males. This finding did not occur in preterm infants, who had longer latencies than term newborns, regardless of gender.

CONCLUSIONS:

Gender and gestational age influence term infants' ABR, with lower responses in females. The weight/gestational age ratio did not influence ABR response in either groups.

evoked potentials, auditory, brain stem; auditory perception; hearing disorders; infant, newborn

	Male/Term					Female/Term
	SGA (n=44)		AGA (n=44)		p-value	SGA (n=44)		AGA (n=44)		p-value
	Mean	SD	Mean	SD	p-value	Mean	SD	Mean	SD	p-value
I	1.78	0.09	1.78	0.08	0.672	1.82	0.10	1.79	0.20	0.401
III	4.67	0.26	4.63	0.23	0.445	4.56	0.23	4.50	0.26	0.191
V	7.10	0.38	6.99	0.21	0.113	6.86	0.23	6.78	0.22	0.253
I-III	2.89	0.24	2.83	0.15	0.182	2.74	0.22	2.71	0.23	0.585
III-V	2.43	0.33	2.39	0.19	0.499	2.28	0.21	2.28	0.23	1.000
I-V	5.31	0.38	5.15	0.49	0.080	5.02	0.27	5.00	0.23	0.752

	Male/Preterm					Female/Preterm
	SGA (n=44)		AGA (n=44)		p-value	SGA (n=44)		AGA (n=44)		p-value p
	Mean	SD	Mean	SD	p-value	Mean	SD	Mean	SD	p-value p
I	1.82	0.10	1.82	0.10	0.862	1.85	0.16	1.81	0.14	0.169
III	4.72	0.24	4.70	0.25	0.656	4.79	0.23	4.74	0.41	0.509
V	7.24	0.35	7.29	0.35	0.556	7.27	0.45	7.27	0.42	1.000
I-III	2.90	0.25	2.84	0.23	0.227	2.93	0.24	2.87	0.35	0.261
III-V	2.52	0.24	2.59	0.25	0.189	2.51	0.28	2.55	0.38	0.589
I-V	5.41	0.31	5.46	0.35	0.514	5.43	0.44	5.43	0.48	1.000

	Term					Preterm
	Male (n=44)		Female (n=44)		p-value	Male (n=44)		Female (n=44)		p-value
	Mean	SD	Mean	SD	p-value	Mean	SD	Mean	SD	p-value
I	1.78	0.09	1.80	0.18	0.304	1.82	0.10	1.83	0.15	0.549
III	4.65	0.25	4.53	0.21	<0.001	4.71	0.24	4.75	0.30	0.312
V	7.04	0.31	6.81	0.23	<0.001	7.26	0.35	7.27	0.43	0.920
I-III	2.86	0.20	2.73	0.22	<0.001	2.87	0.24	2.90	0.30	0.476
III-V	2.38	0.37	2.29	0.22	0.052	2.55	0.24	2.53	0.33	0.572
I-V	5.23	0.44	5.01	0.25	<0.001	5.43	0.33	5.43	0.46	1.000

	Male					Female
	Term (n=44)		Preterm (n=44)		p-value	Term (n=44)		Preterm (n=44)		p-value
	Mean	SD	Mean	SD	p-value	Mean	SD	Mean	SD	p-value
I	1.78	0.09	1.82	0.10	0.005	1.80	0.16	1.83	0.15	0.192
III	4.65	0.25	4.71	0.25	0.115	4.52	0.21	4.76	0.33	<0.001
V	7.04	0.31	7.26	0.35	<0.001	6.81	0.23	7.27	0.43	<0.001
I-III	2.86	0.20	2.87	0.24	0.680	2.73	0.22	2.90	0.30	<0.001
III-V	2.41	0.27	2.55	0.24	<0.001	2.29	0.22	2.53	0.33	<0.001
I-V	5.23	0.44	5.43	0.33	<0.001	5.01	0.25	5.43	0.46	<0.001

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[1] Endereço para correspondência: Rosanna M. Giaffredo Angrisani Rua Botucatu, 802 - Vila Clementino CEP 04023-062 - São Paulo/SP E-mail: roangrisani@gmail.com