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Wednesday, July 10 • 15:30 - 18:00
THE EFFECTS OF SIMULTANEOUS EXPOSURE TO NOISE AND PESTICIDES ON THE AUDITORY AND VESTIBULAR SYSTEMS OF ENDEMIC CONTROL WORKERS IN BRAZIL

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Occupational hearing loss is mainly attributed to noise exposure. However, the presence of certain chemicals in the environment can make the auditory system more vulnerable. This study aimed to assess the effects of simultaneous exposure to noise and pesticides on the peripheral and central auditory systems and vestibular system of endemic disease control workers in Brazil. The sample was comprised of 58 male participants who were divided into two groups. The experimental group (EG, n=40, age range: 48-70 years) were exposed to noise from powered backpack pump sprayers (107 dB SPL) and heavy pump sprayers coupled with vehicles (75 to 110 dB SPL), and pesticides (organophosphates and pyrethroids). The age-matched control group (CG, n=18, age range: 48-72 years) were participants without exposure to noise or pesticides. Participants from both groups were tested with conventional and high-frequency pure-tone audiometry, immittance audiometry, otoacoustic emissions including efferent suppression, auditory brainstem response (ABR) and dichotic digits test (DDT). The vestibular assessment was carried out in EG participants only. The results showed that EG participants presented with significantly worse ipsilateral and contralateral acoustic reflexes and significantly prolonged III and V ABR absolute latencies and I-III and I-V ABR inter-peak latencies in both ears, than CG participants. Also EG participants obtained significantly worse scores for the DDT than CG participants. Finally, the vestibular assessment revealed that 36.4% of EG participants presented with a vestibular disorder, being the peripheral dysfunction the most common vestibular disorder (27.4% of EG participants). It is concluded that simultaneous exposure to noise and pesticides adversely affects the central auditory system and vestibular system of endemic disease control workers.


Wednesday July 10, 2019 15:30 - 18:00 EDT
St-Laurent 3, Board 12-B
  T09 Audiology… & comm. in noise, SS03 Integr prsnl hear protectors …

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