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Peroperative temporary threshold shift in ear surgery. An electrocochleographic study

P Kylén, S D Arlinger, L M Bergholtz

    Acta Oto-Laryngologica
    |November 1, 1977
    PubMed
    Summary
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    Drilling during ear surgery can cause temporary threshold shift (TTS) hearing loss, particularly at high frequencies. Noise exposure duration significantly correlates with the magnitude of this hearing loss.

    Area of Science:

    • Otolaryngology
    • Audiology
    • Neurosurgery

    Background:

    • Chronic otitis media often requires surgical intervention.
    • Drilling in the temporal bone is a common surgical step.
    • Noise-induced hearing loss is a potential surgical complication.

    Purpose of the Study:

    • To investigate temporary threshold shift (TTS) from drilling in the temporal bone during ear surgery.
    • To correlate noise exposure duration with the magnitude of TTS.
    • To understand the impact of surgical noise on hearing function.

    Main Methods:

    • Electrocorticography (ECoG) recordings were used to measure hearing thresholds.
    • Pre- and post-exposure ECoG recordings were taken during surgeries for chronic otitis media.

    Related Experiment Videos

  • Sound levels and duration of drilling noise were monitored.

    • Main Results:

    • Temporary threshold shift (TTS) ranging from 5 to 40 dB at 4 and 8 kHz was detected.
    • A statistically significant correlation was found between the duration of noise exposure and the magnitude of TTS.
    • Hearing loss was predominantly high-toned sensorineural.

    Conclusions:

    • Drill-induced noise during ear surgery can lead to postoperative high-tone sensorineural hearing loss.
    • Surgical manipulation of the ossicular chain primarily causes lower-frequency threshold shifts.
    • Minimizing noise exposure during temporal bone drilling is crucial for preventing hearing loss.