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Correlation between Hearing Threshold of 4000 Hz and HSP 70 Serum Level Post Gunshot Exposure among East Java Police School Students

Department of Otorhinolaryngology, Head and Neck Surgery, Universitas Airlangga, Jl. Mayjen Prof. Dr. Moestopo No. 6-8 Surabaya, 60131, Indonesia
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Exposure to gunshot can cause hearing loss due to damage to hair cells in the cochlea which is indicated as acoustic trauma. Acoustic trauma is a sensorineural type of hearing loss characterized by an increase in the hearing frequency threshold of 4000 Hz. HSP 70 increased significantly. This study aimed at the relationship between 4000 Hz frequency threshold value and serum HSP 70 level after gunshot exposure in East Java Police academy students. The design of study was observational analytic with cross sectional retrospective using secondary data in the form of medical records for East Java police academy students for 2017-18. For all 50 male students, the youngest was 18 years old and the oldest was 21 years. A decrease in the hearing frequency threshold of 4000 Hz indicated as acoustic trauma was found in 28 students (56%), complaints of hearing loss were found in one student (2%) and were not found for complaints
of tinnitus and vertigo. Statistical test with Pearson correlation between serum HSP 70 levels with a hearing frequency threshold of 4000 Hz obtained a correlation coefficient (r) of 0.45 and P=0.001 (P<0.05).
There was a relationship between 4000 Hz and HSP 70 levels after exposure to gunshot eruptions in East Java Police academy students.
Key words : Acoustic trauma, HSP 70, threshold value 4000 Hz