11/12/2025
ποΈ π Can you see the torsion? This patient demonstrated ~5 seconds of LEFT torsional nystagmus in the left Dix-Hallpike test.
π Is it due to posterior canal BPPV? In this case, yes! How do we know? After a repositioning maneuver (left modified Epley), and 10 minutes rest, a re-test of the left Dix-Hallpike showed no nystagmus and resolved positional vertigo symptoms.
ποΈ "BPPV nystagmus is primarily torsional when the gaze is directed ipsilateral toward the side of lesion whereas the nystagmus is primarily vertical when the gaze is directed contralateral toward the side of lesion" (Barin, Petrak, Cassidy and Whitney, 2025). So if we wanted to see the upbeat element better, we could ask the patient to gaze to the RIGHT (away from the affected side) in this case.
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