Effects of prenatal exposure to methylmercury in children auditory processing

Abstract Objective: to assess the central auditory processing of children exposed to mercury during the prenatal period. Design/Study sample: this study evaluated 90 children age eight to ten years, of both genders divided into two groups according to the levels of mercury exposure during the prenat...

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Veröffentlicht in:Cadernos Saúde Coletiva 2016-04, Vol.24 (1), p.70-76
Hauptverfasser: Dutra, Marilene Danieli Simões, Cavadas, Marcia, Jesus, Iracina Maura de, Santos, Elisabeth Oliveira, Câmara, Volney de Magalhães
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Sprache:eng
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Zusammenfassung:Abstract Objective: to assess the central auditory processing of children exposed to mercury during the prenatal period. Design/Study sample: this study evaluated 90 children age eight to ten years, of both genders divided into two groups according to the levels of mercury exposure during the prenatal period: the study group (SG) was composed of children who had total mercury levels in umbilical cord blood samples equal or higher than 8µg/L, and the control group (CG) of children who had Mercury levels lower than 8µg/L. The procedures included a questionnaire, tonal threshold audiometry, word recognition audiometry, tests that assess auditory processing skills; and analysis of the total levels of mercury in umbilical cord blood samples collected at birth. Result: The SG presented mean total mercury in umbilical cord blood of 19.36µg/L and the CG had mean of 4.78µg/L. Regarding the tests that assess central auditory processing, the SG showed worse performance than the CG, and there was a statistically significant difference observed in the Staggered Spondaic Word Test. Conclusion: Children presented disorders in the tests that assess central auditory processing, indicating a possible effect of prenatal exposure to mercury in the central auditory system. Resumo Tema: Processamento auditivo central e exposição pré-natal ao mercúrio. Objetivo: Avaliar processamento auditivo central de crianças expostas ao mercúrio no período pré-natal. Método: Foram avaliadas 90 crianças com idade de 8 a 10 anos, de ambos os sexos, categorizadas em dois grupos de acordo com os níveis de mercúrio na exposição pré-natal. O grupo de estudo (GE) foi composto por crianças que apresentaram teor de mercúrio total em amostras de sangue do cordão umbilical igual ou superior a 8 µg/L, e o grupo de controle (GC), por crianças que apresentaram teor inferior a 8 µg/L. Os procedimentos incluíram questionário, audiometria tonal liminar, logoaudiometria, testes que avaliam habilidades do processamento auditivo e análise dos teores de mercúrio total em amostras de sangue do cordão umbilical coletadas ao nascimento. Resultado: A média de mercúrio total no sangue do cordão umbilical do GE foi de 19,36 µg/L e o do GC, de 4,78 µg/L. Nos testes que avaliam o processamento auditivo central, o GE apresentou desempenho inferior ao GC, sendo observada diferença estatisticamente significante para o Staggered Spondaic Word Test. Conclusão: As crianças apresentaram alteração em testes que avaliam o proces
ISSN:1414-462X
2358-291X
2358-291X
DOI:10.1590/1414-462X201600010278