Persistance of perilymph fistula mechanisms in a completely paretic posterior semicircular canal

Background: Perilymph fistula (PLF) are pathological connections between the perilymphatic space of the labyrinth and the middle ear (outer) or the CSF (inner fistula). These abnormal connections transmit pressure to excite the semicircular canal which clinically leads to paroxysmal vertigo of short duration. Previous PLF studies did not focus on the relation between the canal function and the mechanism that elicits PLF nystagmus. Specifically, how much canal and otolith function is required to still elicit PLF nystagmus? Patient: A 32-year-old truck driver had a 9 months history of recurrent paroxysmal spells o…