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. 2024 Jan;20(1):100-102.
doi: 10.3988/jcn.2023.0299.

Upbeat and Direction-Changing Torsional Nystagmus While Straight Head Hanging: A New Sign of Benign Paroxysmal Positional Vertigo Involving Bilateral Posterior Semicircular Canals

Hyun-Jae Kim  1 , Sang Jin Park  1 , Ji-Soo Kim  2   3
Affiliations

Upbeat and Direction-Changing Torsional Nystagmus While Straight Head Hanging: A New Sign of Benign Paroxysmal Positional Vertigo Involving Bilateral Posterior Semicircular Canals

Hyun-Jae Kim et al. J Clin Neurol. 2024 Jan.
No abstract available

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Conflict of interest statement

Dr. Ji-Soo Kim serves as an associate editor of Frontiers in Neuro-otology and on the editorial boards of Frontiers in Neuro-ophthalmology, Journal of Neuro-ophthalmology, Journal of Vestibular Research, and Clinical and Translational Neuroscience. All remaining authors have declared no conflicts of interest.

Figures

Fig. 1
Fig. 1. Video-oculography of positional nystagmus in the patient. A: During straight head hanging, the initially induced counterclockwise (upper poles of the eyes beating to the left ear) torsional and upbeat nystagmus changed into clockwise torsional and upbeat nystagmus 20 seconds later (arrow), with a transitional period of pure upbeat nystagmus lasting a few seconds. B and C: The Dix-Hallpike maneuver in either direction evoked ipsiversive torsional and upbeat nystagmus. Upward deflection in each recording indicates upward or clockwise eye motion. LT, torsional position of the left eye; LV, vertical position of the left eye.
See this image and copyright information in PMC

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