Case Report: Keep your eyes open! Nystagmus guides atypical BPPV.
Daniel Ludwig, Michael C Schubert
PMID 38606004WHAT IT FOUND
Nystagmus direction, duration, torsion, and intensity during positional tests helped identify the affected canal in four patients with atypical BPPV, even when results seemed bilateral or unusual.
The cases do not prove the maneuvers worked.
Key findings
01Four cases showed atypical BPPV nystagmus patterns that can make the affected canal hard to identify.
02Changing gaze direction can accentuate the torsional component and help lateralize the affected posterior canal.
03Nystagmus can change from horizontal to vertical and torsional within the same test.
STILL TO COME
How it was doneWhat they foundWhat it means for PTs
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What it does not show
Only four patients were described, so these patterns may not occur in every patient with BPPV. Follow-up was incomplete: some patients did not return to the clinic, and a patient cancelled because of neck discomfort. Several tests and maneuvers were performed in sequence, so the contribution of any single maneuver cannot be separated. The cases were selected for atypical nystagmus, so they do not show how common these patterns are. The authors' explanations of mechanisms are based on physiology and cited literature, not experimental proof in these patients.
The easy way to misread this
Do not read these cases as proof that repositioning maneuvers work. They describe individual patients, some did not return for follow-up, and the report did not compare groups.