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Transient threshold shift after gunshot noise exposure.

B Saedi1, M Ghasemi, M Motiee

  • 1Otolaryngology Department, Tehran University of Medical Sciences, Tehran, Iran. saedi@tums.ac.ir

B-ENT
|August 6, 2013
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Summary
This summary is machine-generated.

Exposure to AK-47 gunshot noise without ear protection can cause hearing impairment, particularly at higher frequencies. Auditory evaluations showed a temporary increase in hearing issues after exposure, with some improvement over time.

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Area of Science:

  • Auditory science
  • Occupational health
  • Military medicine

Background:

  • Soldiers and others face routine exposure to high-intensity gunshot noise.
  • This noise may cause Transient Threshold Shifts (TTS) and mechanical alterations in auditory structures.
  • The AK-47 rifle's noise impact on shooter audition requires investigation.

Purpose of the Study:

  • To measure the noise scope of the AK-47 rifle.
  • To assess the immediate and short-term impact of this noise on soldiers' hearing.
  • To identify specific auditory changes following exposure.

Main Methods:

  • Forty novice soldiers (80 ears) were studied.
  • Gunshot noise levels were measured.
  • Auditory function was evaluated using Pure Tone Audiometry (PTA) and Oto-Acoustic Emission (OAE) before and immediately after exposure.

Main Results:

  • AK-47 noise levels ranged from 73.7 to 111.4 dBA.
  • Subclinical hearing impairment increased from 14 to 16 participants post-exposure.
  • PTA revealed significant threshold alterations at 6 kHz, while OAE remained normal.

Conclusions:

  • Gunshot noise exposure without protection poses a significant auditory hazard.
  • Hearing function is particularly vulnerable at higher frequencies.
  • Temporary hearing impairment can occur, with potential for partial recovery.