Question about temporary threshold shift?

Discussion in 'Support' started by mick1987, Nov 17, 2013.

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    1. mick1987
      No Mood

      mick1987 Member

      Location:
      UK (England)
      Tinnitus Since:
      08/2012
      Cause of Tinnitus:
      Acoustic Trauma
      Hello guys, I've got a question regarding temporary threshold shift ?(blocked full ears),

      First time I got tinnitus from loud noise, I got temporary threshold shift straight away followed by tinnitus for over a year now.

      5 weeks ago I got a spike from a loud noise, but unlike the last time when I got temporary threshold shift straight away, it took my ears 6 hours to get the blocked ear feeling you get from TTS, that lasted 5 days before disappearing.

      Now I am wondering if the spike is even from loud noise because it was a whole 6 hours later I got TTS. Or is it just a coincidence and more like something unrelated, such as congestion etc.

      I've been wondering this for over a month now and I would love it if you could help me out.
      Thanks
      Mick
       
    2. mick1987
      No Mood

      mick1987 Member

      Location:
      UK (England)
      Tinnitus Since:
      08/2012
      Cause of Tinnitus:
      Acoustic Trauma
      does temporary threshold shift happen straight after loud noise or can there be a delay of like 6 hours?
       
    3. Markku
      Inspired

      Markku Director Staff Benefactor Hall of Fame Team Trobalt Team Tech Team Awareness Team Research

      Tinnitus Since:
      04/2010
      Cause of Tinnitus:
      Syringing
      Not 100% sure, but I found this:
      Noise - Auditory Effects : OSH Answers
      Also known as temporary threshold shift (TTS) which occurs immediately after exposure to a high level of noise. There is gradual recovery when the affected person spends time in a quiet place. Complete recovery may take several hours.

      But I also found this:
      PubMed: Delayed temporary threshold shift induced by impulse noises (weapon noises) in men.
      Abstract
      Most of the available information on the effects of impulse noise on hearing is derived from temporary threshold shift (TTS2) measurements performed 2 min after a single exposure to small-weapon noises. TTS is known to recover as a linear function of the logarithm of time when it is induced by a continuous noise of moderate intensity. Following the exposure to impulse noise, several investigators have reported individual exceptions to the log-time relation, e.g. increases in TTS during the first hour of recovery. These authors observed a 'rebound recovery function' for most of the exposed men, and they conclude that this phenomenon '... has implications for the use of TTS in the construction of damage risk criteria for hazardous noise exposure ..., a single measure, such as the widely used TTS2 may not be an adequate index of the magnitude of the TTS'. In order to thoroughly investigate in man the existence of 'delayed' TTS following the exposure to actual weapon noises, the 'French Committee on Weapon Noises' carried out the following study. Three groups of soldiers (28 subjects) wearing no hearing protection were exposed in the free field over 2 days to impulse noises produced by a rifle. Békésy audiograms were obtained from each subject just before the exposure, and at 5 min, 1 h and 4 h after exposure. All audiometric tests were carried out even when no TTS was observable in the first postexposure audiogram. A significant number of subjects showed a 'delayed TTS' and/or 'rebound recovery'. The maximum TTS was observed at 1 h after exposure, but the observation of a delayed recovery and a rebound recovery indicate that audiometric tests should be performed in all cases at least up to 4 h after the exposure. More detailed work is necessary to establish what changes may be necessary in the present damage risk criteria for impulse noises of a very high level.
       
    4. mick1987
      No Mood

      mick1987 Member

      Location:
      UK (England)
      Tinnitus Since:
      08/2012
      Cause of Tinnitus:
      Acoustic Trauma
      Thanks for that markku,

      i haven't got a clue if closing a car bonnet caused temporary threshold shift 6 hours later.
      Just knowing that it wasn't from noise and the blocked ears was from a sinus infection or something else, then maybe my spike will go back down.
       
    5. mick1987
      No Mood

      mick1987 Member

      Location:
      UK (England)
      Tinnitus Since:
      08/2012
      Cause of Tinnitus:
      Acoustic Trauma
      Does anyone else know if temporary threshold shift can be delayed for 6 hours?
      Slammed shut car bonnet/hood at 10 am and it wasn't until 4 pm I got stuffy blocked ears that lasted 5 days after, leaving me with a massive increase these past 6 weeks?
       
    6. mick1987
      No Mood

      mick1987 Member

      Location:
      UK (England)
      Tinnitus Since:
      08/2012
      Cause of Tinnitus:
      Acoustic Trauma
      Can I ask anyone who got temporary threshold shift with noise induced tinnitus if you got the stuffy ears straight away, I did the first time I got tinnitus, but not this time.

      Can a car bonnet/hood slamming shut cause temporary threshold shift?

      Can temporary threshold shift be delayed for 6 hours after?

      I've had this horrible spike for 7 weeks now and I want to know if it is caused by noise or if it was something unrelated the same day.

      Thankyou.
       

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