Análise das emissões otoacústicas evocadas por produto de distorção em neonatos prematuros

Diniz, Jaqueline Batista; Carvalho, Sirley Alves da Silva; Ferreira, Daniele Barreto Cunha; Ramos, C; Bassi, Iara Barreto; Resende, Luciana Macedo de

doi:10.1590/1982-0216201419012

Cited by 2 publications

(6 citation statements)

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“…Another study showed similar results, with "pass" index in 1582 neonates (93.6%) (25) . The fact that there is no difference between genders when comparing the amplitude of the DPOAEs in preterm and term neonates also confirms the data of other surveys conducted by the same procedure (27) and also using TOAEs (21) . Regarding the amplitude average of the DPOAEs, whose highest values are related to frequencies of 2 kHz and 6 kHz, similar data were obtained from a study that analyzed the DPOAEs in 50 premature neonates, with results that indicated the frequencies of 2 kHz and 8 kHz as the highest amplitude (17) .…”

Section: Discussionsupporting

confidence: 83%

“…Some authors that observed a gradual increase in the amplitude of the DPOAEs with the increase of the conception age until the 35th week of life (26) have also agreed with the findings above. Other researchers who used TOAEs in the analysis of preterm and term neonates (21) as well as the DPOAEs with exclusive evaluation of preterm neonates (27) also observed the increase of the amplitude of the otoacoustic emissions with the increase of the gestational age. This fact presented itself as a trend, but was not statistically proven (21,27) .…”

Section: Discussionmentioning

confidence: 87%

“…Other researchers who used TOAEs in the analysis of preterm and term neonates (21) as well as the DPOAEs with exclusive evaluation of preterm neonates (27) also observed the increase of the amplitude of the otoacoustic emissions with the increase of the gestational age. This fact presented itself as a trend, but was not statistically proven (21,27) . Once more, the methodological choices can justify the differences between these studies and the findings of this research.…”

Section: Discussionmentioning

confidence: 87%

“…However, the authors do not agree about the structures involved in the maturation process and period of occurrence. Some highlight the maturation of the inner ear as the main responsible for the increase of the amplitude of the OAEs (21,24,26,27) . Others emphasize the anatomical and functional maturation of the outer and middle ears, cochlear and medial olivocochlear system, synergistically contributing for this increase (20) .…”

Section: Discussionmentioning

confidence: 99%

“…The literature indicates differences between the auditory function of preterm and term infants, both measured by DPOAEs (20,22,(24)(25)(26) as by TOAEs (21) , regarding the presence of OAEs (25,26) and amplitude of the responses (19,21,22,24,26) as well as the presence and threshold of suppression of the OAEs (22,23) . In order to better understand the auditory characteristics of the preterm neonates, a research conducted the analysis of the DPOAEs in preterm neonates, with the hypothesis that the gestational age (GA) would influence the amplitude of the DPOAEs, which would indicate the existence of peripheral auditory maturation during prematurity (27) . It is believed that the comparative analysis of the DPOAEs in preterm and term neonates is useful to check if the GA influences the occurrence and amplitude of the responses during the examination.…”

Section: Introductionmentioning

confidence: 99%

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Maturação auditiva periférica: análise das amplitudes das emissões otoacústicas produto de distorção em neonatos pré-termo e a termo

Ferreira

Araújo²,

Marques³

et al. 2014

Audiol., Commun. Res.

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Purpose: To compare preterm and term neonates in relation to the presence and amplitude of Distortion Product Otoacoustic Emissions (DPOAEs), as well as to characterize them regarding risk indicators for hearing loss. Methods: Study realized by the analysis of the DPOAEs (frequencies of 2000, 3000, 4000, 6000 and 8000 Hz) and risk indicators for hearing loss. The neonates were grouped according to the gestational age. The results were analyzed by ANOVA, Kruskal-Wallis and Chi--square tests (5%). Results: The sample consisted of 109 neonates (218 ears) in homogenous distribution related to gender and preterm/term classification. A high risk for hearing loss was observed in 40.4% of the infants. From the risk indicators for hearing loss, the most common were the duration of the stay in incubators and intensive care units (ICU) longer than five days. The DPOAEs were present in 209 ears (95.9%). The absence of responses to DPOEAs was significantly more frequent in groups with lower gestational age. It was observed an increase of the amplitudes of the DPOEAs with the increase of the gestational age, except for the frequency of 8000 Hz in the left ear. There were no differences between ears and genders regarding the presence and amplitude of the DPOAEs. Conclusion: There are differences between preterm and term groups in relation to the presence and amplitude of the DPOAEs: higher probability of failure in the groups with lower gestational age and (nonlinear) increase of the amplitudes with the increase of the gestational age. The findings suggest the phenomenon of maturation of the peripheral auditory system. Keywords: Hearing; Neonatal screening; Infant, premature; Hair cells, auditory; Hearing disorders; Early diagnosis; Diagnostic techniques, otological; Speech, language and hearing sciences RESUMO Objetivo: Comparar neonatos prematuros e a termo quanto à presença e amplitude das Emissões Otoacústicas Produto de Distorção (EOAPD), bem como caracterizá-los em relação aos indicadores de risco para perda auditiva. Métodos: Estudo realizado por análise das EOAPD (frequên-cias de 2000, 3000, 4000, 6000 e 8000 Hz) e dos indicadores de risco para perda auditiva. Os neonatos foram agrupados segundo a idade gestacional. Os resultados foram analisados empregando-se testes ANOVA, Kruskal-Wallis e Qui-quadrado (5%). Resultados: A amostra constituiu--se de 109 neonatos (218 orelhas), com distribuição homogênea quanto ao gênero e a classificação a termo/pré-termo. Foi observado alto risco para perda auditiva em 40,4% dos lactentes. Dos indicadores de risco para deficiência auditiva, os mais frequentes foram a permanência em incubadora e internação em UTI superiores a cinco dias. As EOAPD mostraram-se presentes em 209 orelhas (95,9%). A ausência de respostas às EOAPD foi significativamente mais recorrente nos grupos com menor idade gestacional. Verificou-se aumento das amplitudes das EOAPD de acordo com o aumento da idade gestacional, exceto para a frequência de 8000 Hz na orelha esquerda. Não foi observada diferença ent...

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Section: Discussionsupporting

confidence: 83%