Potenciais evocados auditivos tardios em indivíduos com queixa de zumbido Late Auditory evoked potentials in individuals with tinnitus

Abstract

A presença de alterações nos potenciais evocados auditivos de longa latência (PEALL) em indivíduos com zumbido sugere disfunção de vias auditivas centrais em nível cortical. OBJETIVO: Caracterizar o PEALL em indivíduos com e sem zumbido expostos a ruído ocupacional. MATERIAL E MÉTODO: Estudo prospectivo, de coorte contemporânea com corte transversal. Foram avaliados, por meio do PEALL, 60 sujeitos expostos a ruído de origem ocupacional, entre 29 e 50 anos de idade, sendo 30 com zumbido e 30 sem zumbido. RESULTADOS: Observou-se diferença estatisticamente significante com relação aos valores médios das latências das ondas N1(pLong latency auditory evoked potentials (LLAEP) alterations in individuals with tinnitus are suggestive of dysfunction in the central auditory pathways at a cortical level. AIM: to characterize the LLAEP in individuals with and without tinnitus exposed to occupational noise. METHOD: Cross-sectional contemporary cohort, prospective study. Sixty subjects exposed to occupational noise, ranging in age from 29 to 50 years underwent LLAEP assessment; 30 of them had tinnitus complaint and 30 did not have tinnitus. RESULTS: we observed significant statistical difference regarding the mean values of latencies of waves N1 (p<0.001), P2 (p=0.002) and P300 (p=0.039) when we compared individuals with and without tinnitus. In individuals with tinnitus we also noticed a greater number of altered results concerning components N1 (60%) and P2 (66.7%), although only component P2 presented significant statistical difference (p=0.010). For the LLAEP, the latency increase was the only type of alteration found (p=1.000). We found a greater association between bilateral tinnitus and bilateral alteration for all components N1(73%), P2(73%) and P300(50%). CONCLUSION: It is relevant to study LLAEP in individuals with tinnitus exposed to high occupational sound pressure levels.

Keywords

• eletrofisiologia
• potenciais evocados auditivos
• ruído ocupacional
• zumbido
• evoked potentials
• occupational
• noise
• tinnitus