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Audiometric profile and evoked otoacoustic emissions per product of distortion in transit managers, exposed to carbon monoxide and noise

PURPOSE: to evaluate the hearing profile and otoacoustic emission evoked by distortion product in Traffic Managers exposed to noise and carbon monoxide, as well as to establish the presence of both agents at their work environment. METHOD: 37 workers were divided into two groups: G1 formed by 18 individuals with no history of concomitant exposure to carbon monoxide and noise, and G2 formed by 19 workers simultaneously exposed to both agents. To determine the presence of those agents, audio dosimeter and short period evaluation with instantaneous measurement were used. The variances of anamnesis were studied applying the Student t test and Mann-Whitney test. Otoacoustics emissions and auditory thresholds were analyzed by chi-square or Fisher exact and Wilcoxon test with 5% significance. RESULTS: it was verified the presence of carbon monoxide and noise during the workers' activity. There was no significant difference in age and time of function. The average hearing threshold was greater on G2 for the right ear at 1KHz (p=0,050) and for the left at 3KHz (p=0,016) and 4KHz (p=0,028). The audiometric changes showed that G2 was significantly worse at 3KHz on the left ear (p=0,003) compared to G1. The Emissions showed worse results in G2 when compared to G1 for 2.730Hz and 3.218Hz (p=0.016) on the right ear. It was found significant impairment in both exams responses, in both ears, at the frequency ranges between 2.730Hz and 7.604Hz in G2 group. CONCLUSION: workers exposed to carbon monoxide and noise showed worst results in the auditory thresholds and Otoacoustic Emissions when compared to non-exposed group.

Hearing Loss; Carbon Monoxide; Drug Synergism; Asphyxiating Gases; Audiometry


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