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Audiometric abnormalities in hemifacial spasm.

M B Møller, A R Møller

    Audiology : Official Organ of the International Society of Audiology
    |January 1, 1985
    PubMed
    Summary
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    This study found auditory nerve compression in 23% of hemifacial spasm patients undergoing microvascular decompression. This compression may explain hearing abnormalities in the low-frequency range.

    Area of Science:

    • Neurology
    • Otolaryngology
    • Neuroscience

    Background:

    • Hemifacial spasm (HFS) is a neurological disorder characterized by involuntary contractions of facial muscles.
    • Auditory nerve involvement is not a commonly recognized symptom of HFS.
    • Microvascular decompression is a surgical treatment for HFS, involving the separation of compressing blood vessels from cranial nerves.

    Purpose of the Study:

    • To investigate the prevalence and characteristics of auditory pathway abnormalities in patients with hemifacial spasm.
    • To explore the potential link between the causative vascular compression in HFS and auditory nerve function.
    • To determine if auditory nerve compression by vascular structures can explain observed hearing threshold changes.

    Main Methods:

    • Evaluation of 143 patients with primary hemifacial spasm.

    Related Experiment Videos

  • Pre- and postoperative audiological assessments including pure-tone audiometry, speech audiometry, and acoustic middle ear reflex thresholds.
  • Recording of auditory brainstem responses (ABRs) to assess the integrity of the auditory pathway.
  • Intraoperative confirmation of vascular compression of the seventh cranial nerve at its root entry zone.

    • Main Results:

    • Abnormal pure-tone audiogram 'notches' were observed in 11% of patients.
    • Low-frequency up-sloping pure-tone thresholds were found in 12% of patients.
    • A combined 23% of patients exhibited auditory threshold abnormalities potentially related to HFS.
    • Vascular compression of the seventh cranial nerve was confirmed in all surgically treated patients.

    Conclusions:

    • A significant percentage of hemifacial spasm patients exhibit auditory pathway abnormalities.
    • The findings suggest that the same vascular compression causing HFS may also compress the auditory nerve.
    • Mid- and low-frequency hearing threshold changes may indicate compression affecting the outer part of the auditory nerve at the brainstem entry point.