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Noise induced hearing loss

Noise induced hearing loss. Predisposing factors: Drug use (aspirin) Gender Cause: Exposure to noise Acoustic trauma: Damage due to loud impulsive noise. Two forms of NIHL Temporary threshold shift (TTS) Permanent threshold shift (PTS)

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Noise induced hearing loss

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  1. Noise induced hearing loss Predisposing factors: Drug use (aspirin) Gender Cause: Exposure to noise Acoustic trauma: Damage due to loud impulsive noise

  2. Two forms of NIHL Temporary threshold shift (TTS) Permanent threshold shift (PTS) Relationship between noise level and duration of exposure (OSHA, 1983) 85 dB A: 8 hours 90 dB A: 4 hours 95 dB A: 2 hours 105 dB A: 30 minutes

  3. Audiometric findings Sensorineural hearing loss Usually progressive with continued noise exposure Characteristic notch around 4000 Hz Tinnitus matched to frequencies around 3-6 kHz

  4. Measures to prevent NIHL Avoid noise exposure, especially if on certain types of medication Hearing protection Monitor hearing loss periodically

  5. Presbycusis Age-related hearing loss Progressive, sensorineural Effects first seen in high frequencies Age-related changes occur not only in cochlea Often: Speech-understanding difficulties

  6. Progression of hearing loss with age in females and males

  7. Méniére disease Disease that originates in the labyrinth Classic symptoms: Hearing loss, tinnitus, and vertigo Symptoms can be paroxysmal, and are usually progressive. Probable causes: Endolymphatic hydrops, others Treatment: Diuretics to limit fluid retention, diet control, sedatives, vestibular suppressants, surgery.

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