PMC8440101_01
Left-sided Dix-Hallpike test performed during the initial videonystagmography (VNG) recorded upbeat nystagmus, of SPV 22 /s.
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fig1
The graphical recording of the left-sided Dix-Hallpike test performed as a part of videonystagmography (VNG) manifested an isolated upbeat nystagmus, measuring SPV 22 /s (Figure 1), while a right-sided test manifested a horizontal ageotropic nystagmus measuring SPV 13 /s (Figure 2).
Right-sided Dix-Hallpike test performed during the initial VNG recorded horizontal ageotropic nystagmus of SPV 13 /s.
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fig2
The graphical recording of the left-sided Dix-Hallpike test performed as a part of videonystagmography (VNG) manifested an isolated upbeat nystagmus, measuring SPV 22 /s (Figure 1), while a right-sided test manifested a horizontal ageotropic nystagmus measuring SPV 13 /s (Figure 2).
Right-sided Dix-Hallpike test performed during the follow-up exam a week after the initial VNG recorded geotropic vertical-rotatory PN lasting for 10 seconds with the upbeat directed vertical component of SPV 31 /sec and a torsion geotropic directed component of SPV 8 /sec.
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fig3
A follow-up left-sided Dix-Hallpike test was negative, while a right-sided Dix-Hallpike test resulted in a severe dizziness and an apogeotropic vertical-torsional nystagmus lasting for ten seconds, with a vertical component directed upwards, measuring 31 /sec, and with a torsional component measuring 8 /sec, directed to the right (geotropic) (Figure 3 and supplementary video 3).