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P300 in workers exposed to occupational noise

  • Massa, Camila Gonçalves Polo
  • Rabelo, Camila Maia
  • Moreira, Renata Rodrigues
  • Matas, Carla Gentile
  • Schochat, Eliane
  • Samelli, Alessandra Giannella
Publication Date
Jan 01, 2012
Biblioteca Digital da Produção Intelectual da Universidade de São Paulo (BDPI/USP)
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The harm upon the central auditory pathways of workers exposed to occupational noise has been scarcely studied. Objective: To assess the central auditory pathways by testing the long latency auditory evoked potentials (P300) of individuals exposed to occupational noise and controls. Method: This prospective study enrolled 25 individuals with normal hearing thresholds. The subjects were divided into two groups: individuals exposed to occupational noise (13 subjects; case group) and individuals not exposed to occupational noise (12 subjects; control group). The P300 test was used with verbal and non-verbal stimuli. Results: No statistically significant differences were found between ears for any of the stimuli or between groups. The groups had no statistically significant difference for verbal or non-verbal stimuli. Case group subjects had longer latencies than controls. In qualitative analysis, a greater number of altered P300 test results for verbal and non-verbal stimuli was seen in the case group, despite the absence of statistically significant differences between case and control subjects. Conclusion: Individuals exposed to high sound pressure levels had longer P300 latencies in verbal and non-verbal stimuli when compared to controls.

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