Spontaneous downbeat nystagmus in posterior semicircular canal benign paroxysmal positional vertigo: a canalith jam?

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Correspondence to Andrea Castellucci.

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10072_2020_4529_MOESM1_ESM.avi

Presenting video-oculography showing spontaneous downbeat nystagmus with a torsional component beating toward the left side (upper eye poles). Straight head hanging position slightly enhanced spontaneous nystagmus. A therapeutic Demi-Semont maneuver for BPPV involving the non-ampullary arm of the right posterior semicircular canal is shown (AVI 15411 kb)

10072_2020_4529_MOESM2_ESM.avi

Post-treatment video-oculography showing a total receding of spontaneous nystagmus. Right Dix-Hallpike maneuver still elicited a subtle positional downbeat nystagmus with a torsional component beating toward the left ear (upper eye poles) probably consistent with few residual debris within the non-ampullary arm of the right posterior semicircular canal (AVI 15044 kb)

Online Resource 1

Presenting video-oculography showing spontaneous downbeat nystagmus with a torsional component beating toward the left side (upper eye poles). Straight head hanging position slightly enhanced spontaneous nystagmus. A therapeutic Demi-Semont maneuver for BPPV involving the non-ampullary arm of the right posterior semicircular canal is shown (AVI 15411 kb)

Online Resource 2

Post-treatment video-oculography showing a total receding of spontaneous nystagmus. Right Dix-Hallpike maneuver still elicited a subtle positional downbeat nystagmus with a torsional component beating toward the left ear (upper eye poles) probably consistent with few residual debris within the non-ampullary arm of the right posterior semicircular canal (AVI 15044 kb)

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Castellucci, A., Malara, P. & Ghidini, A. Spontaneous downbeat nystagmus in posterior semicircular canal benign paroxysmal positional vertigo: a canalith jam?. Neurol Sci (2020). https://doi.org/10.1007/s10072-020-04529-9

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