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2 results

  • Experimental study on the aetiology of benign paroxysmal positional vertigo due to canalolithiasis: comparison between normal and vestibular dysfunction models

  • K Otsuka, M Negishi, M Suzuki, T Inagaki, M Yatomi, U Konomi, T Kondo, Y Ogawa
  • Journal:
    The Journal of Laryngology & Otology / Volume 128 / Issue 1 / January 2014
    Published online by Cambridge University Press:
    14 January 2014, pp. 68-72
    Print publication:
    January 2014
  • Objectives:

    Using American bullfrog models under normal conditions and under vestibular dysfunction, we investigated whether mechanical vibration applied to the ear could induce otoconial dislodgement.

    Methods:

    Vibration was applied to the labyrinth of the bullfrog using a surgical drill. The time required for the otoconia to dislodge from the utricular macula was measured. Vestibular dysfunction models were created and the dislodgement time was compared with the normal models. The morphology of the utricular macula was also investigated.

    Results:

    In the normal models, the average time for otoconial dislodgement to occur was 7 min and 36 s; in the vestibular dysfunction models, it was 2 min and 11 s. Pathological investigation revealed that the sensory hairs of the utricle were reduced in number and that the sensory cells became atrophic in the vestibular dysfunction models.

    Conclusion:

    The otoconia of the utricle were dislodged into the semicircular canal after applying vibration. The time to dislodgement was significantly shorter in the vestibular dysfunction models than in the normal models; the utricular macula sustained significant morphological damage.

  • Fenestration and occlusion of posterior semicircular canal for patients with intractable benign paroxysmal positional vertigo

  • Maurice Hawthorne, Mohamed El-Naggar
  • Journal:
    The Journal of Laryngology & Otology / Volume 108 / Issue 11 / November 1994
    Published online by Cambridge University Press:
    29 June 2007, pp. 935-939
    Print publication:
    November 1994

  • A series of 15 patients with intractable benign paroxysmal positional vertigo (BPPV) who had fenestration and occlusion of the posterior semicircular canal (FOP) surgery commencing in December 1990 are reported. Follow-up was from 14 to 40 months. All patients reported a cure of their positional vertigo. No patient regretted having the surgery. All patients had a negative Dix-Hallpike test post-operatively and the test remained negative for the duration of follow-up. Eight patients had a mild high frequency sensorineural hearing (SNHL) loss post-operatively which had almost recovered six months later. No patient reported any change in their hearing following surgery. Of the 10 patients who did not have pre-operative tinnitus, developed tinnitus but it was not considered significant by them. All patients developed mild unsteadiness following surgery which gradually improved with mobilization and physiotherapy if necessary.

    The operation preserves hearing, is technically straightforward, well-tolerated and effective.