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Figure 4 | BMC Ophthalmology

Figure 4

From: Lying-down nystagmus and head-bending nystagmus in horizontal semicircular canal benign paroxysmal positional vertigo: are they useful for lateralization?

Figure 4

Thirty-degree head flexion from the pitch plane. When it is performed before the lying-down test (A, B) in right horizontal semicircular canal benign paroxysmal positional vertigo (HSC-BPPV), more intense lying-down nystagmus is elicited due to greater angular acceleration (C). (Adapted from reference [23]: G. Asprella-Libonati. Pseudo-Spontaneous Nystagmus: a new sign to diagnose the affected side in Lateral Semicircular Canal Benign Paroxysmal Positional Vertigo. Acta otorhinolaryngologica Italica : organo ufficiale della Societa italiana di otorinolaringologia e chirurgia cervico-facciale, Figure one, three 2008, 28(2):73–78., with permission, Copyright © by Società Italiana di Otorinolaringologia e Chirurgia Cervico-Facciale Via Luigi Pigorini, 6/3 00162 Roma, Italy).

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BMC Ophthalmology

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