Noise-induced hearing loss in disc jockeys

Abstract

Noise-induced hearing loss (NIHL) is a permanent sensory impairment caused by extended exposure to loud noises, posing a significant occupational risk for numerous professional categories, including disc jockeys (DJs). This study is the initial formal examination of the auditory health of Maltese DJs, a profession frequently neglected in occupational health discussion. The study sought to evaluate hearing thresholds and identify any indicators of Noise-Induced Hearing Loss (NIHL) in local DJs utilising pure tone audiometry (PTA), Distortion Product Otoacoustic Emissions (DPOAE) tests, and an extensive questionnaire regarding noise exposure patterns. The research utilised a quantitative, cross-sectional design and comprised 11 voluntary participants. Although all DJs met the World Health Organisation (WHO) standards for normal hearing thresholds, 36% (n=4) displayed high-frequency notches at 4 kHz, indicative of early noise-induced hearing loss (NIHL). The DPOAE tests indicated anomalies at 8 kHz in 72.7% (n=8) of right ears and 81.8% (n=9) of left ears, implying early cochlear damage that may not be evident in typical audiometric assessments. Though the limited sample size restricts the generalisation of these results, recent studies on musicians and noise-exposed employees indicate that minor cochlear alterations can occur even in cases of clinical hearing loss not yet observable. These results highlight the need of performing frequent audiological tests, encouraging hearing protection, and creating focused hearing conservation initiatives for DJs and other individuals working in the entertainment industry. Long-term auditory damage in this population could be avoided by establishing noise regulations in entertainment venues and increasing knowledge about the risks of continuous high sound levels.