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Selective Canal Impairment on Video-HIT in Peripheral Vestibular Diseases

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1.  Which of the following findings does NOT fit the diagnosis of acute unilateral vestibular loss in the acute stage? Normal cochlear function Canal paresis on caloric test Selective impairment for the horizontal semicircular canal at the video-HIT Reduced amplitudes of ocular VEMPs

2.  In case of sudden hearing loss and vertigo associated with ipsilateral selective loss of the posterior semicircular canal at the video-HIT, which of the following represents the most likely underlying diagnosis? Inferior vestibular neuritis Labyrinthine ischemia Canalith jam Vestibular schwannoma

3.  Which of the following measurements represents the most likely detectable data in a patient in the chromic stage of Menière’s disease? Canal hypofunction on caloric test Impaired cervical-VEMPs Selective impairment for the posterior semicircular canal at the video-HIT. All of the above

4.  How is canal dehiscence supposed to result in VOR-gain impairment for the affected canal at the video-HIT? Through a possible spontaneous “auto-plugging” process exerted by middle/posterior fossa dura on the affected canal Through a possible dissipation through the bony defect of the mechanical energy needed to efficiently deflect the canal ampulla during the head impulses All of the above None of the above

5.  Which of the following statements is true? Endolymphatic hydrops can result in selective posterior canal impairment at the video-HIT in both acute and chronic stages od Menière’s disease Endolymphatic hydrops can never result in selective anterior canal impairment at the video-HIT in the acute stage of Menière’s disease Endolymphatic hydrops can only result in selective horizontal canal impairment at the video-HIT in the acute stage of Menière’s disease Endolymphatic hydrops always result in both posterior and horizontal canal impairment at the video-HIT in the chronic stages of Menière’s disease