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[Findings of standard and high-frequency audiometry in workers exposed to occupational noise for long durations]
Sami Türkkahraman1, Uzeyir Gök, Turgut Karlidağ
1Department of Otolaryngology, Kahramanmaraş State Hospital, Kahramanmaraş, Turkey.
Objectives:
Changes in hearing thresholds were determined by standard and high-frequency audiometry in subjects exposed to occupational noise for long durations.
Patients And Methods:
Hearing thresholds were measured between 250 and 16000 Hz frequencies by standard and high-frequency audiometry in 64 male workers (mean age 42 years; range 31 to 55 years) of a hydroelectric power plant and in 30 age- and sex-matched controls with no hearing problems. The workers were divided into three groups according to the noise level and into four groups according to the duration of exposure.
Results:
The mean hearing thresholds of workers showed significant increases in all frequencies from 4000 to 16000 Hz (p<0.005), the most affected frequencies being 4000, 6000, 14000, and 16000 Hz (p<0.0005). Increases in hearing thresholds were significantly correlated with the noise level and duration of exposure to noise (p<0.05).
Conclusion:
The results suggest that high-frequency audiometry should be used together with standard audiometry in the detection and follow-up of individuals who are at potential risks for hearing losses.
