Superior canal dehiscence presentation by Sean Lennox
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This document summarizes the results of tests performed on a patient with long-standing hearing loss and episodes of vertigo and dizziness after loud sounds. Test results found greater left than right vestibular-evoked myogenic potential amplitude and threshold. Caloric testing revealed a 40% unilateral weakness on the left. The Valsalva test produced a torsional down-beat nystagmus toward the left. Management may include a PE tube and surgical intervention like superior canal plugging.
Superior canal dehiscence presentation by Sean Lennox
- 1. Sean Lennox Advanced Hearing Group of Clinics Audiologist. MSc. AuD. Candidate 2012
- 2. He could hear his eyes moving and breathing (autophony). He noted vertigo and unsteadiness after listening to a loud sounds. He noted that he could make his eyes "shake" when listening to a certain pitch at a particular level. Long-standing HL primarily sensory neural from childhood, a suspected viral inner ear infection.
- 6. Left VEMP P13-N23 amplitude was greater than Right using a click at 90dB nHL. Left VEMP threshold lower than right, at 80dB nHL left and Right at 95dB nHL. Electrocochleography: normal SP/AP AU
- 7. Oculomotor tests were normal bilaterally. Postional/positioning tests were normal bilaterally. Calorics: There was a 40% unilateral weakness left (consistent with a previous inner ear attack) Valsalva Test: torsional down-beat nystagmus noted toward left.
- 8. Behavioural: avoidance of stimuli and actions that lead to the dizziness. Otologic management: PE tube to avoid pressure changes that lead to vertigo. Surgical intervention for superior canal plugging or resurfacing being considered
- 9. Halmagyi et al., 2005 G.M. Halmagyi, I.S. Curthoys, J.G. Colebatch and S.T. Aw, Vestibular responses to sound. Ann NY Acad Sci, 1039 (2005), pp. 5467.