Quantitative Analysis of the Nystagmus of Posterior Canal Benign Paroxysmal Positional Vertigo and Its Association With Prognosis.
Fangzhou Yu, Jieli Zhao, Jiaodan Yu and 4 others
PMID 41730076WHAT IT FOUND
In posterior canal BPPV, Dix-Hallpike latency and day 0 treatment success did not predict later dizziness or resolution, but torsional up-beating nystagmus during the Epley maneuver was linked to treatment success.
Key findings
01During the modified Epley maneuver, torsional up-beating nystagmus in the third position was associated with higher treatment success (73.0% versus 44.8% when both treatments were combined).
02Latency of positional nystagmus did not predict treatment success (58.1% without latency versus 68.7% with latency), but nystagmus lasting under 10 sec was associated with more residual dizziness (55.6% versus 39.4%).
03Among 40 participants who did not respond to the modified Epley maneuver and received 360° rotation, 24 achieved complete resolution at first follow-up, higher than the 38.4% resolution rate in participants who did not receive it.
STILL TO COME
How it was doneWhat they foundWhat it means for PTs
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What it does not show
Follow-up was only to 30 days, so the paper cannot show whether nystagmus patterns predict long-term recovery or recurrence. The study did not measure nystagmus intensity, and it excluded horizontal canal BPPV and cupulolithiasis, so the findings do not apply to those presentations. Participants came only from ENT clinics, so the sample may not represent people with positional nystagmus from other causes or other care settings. Treatment was not randomised. The 360° rotation group had already failed the modified Epley maneuver, so its higher resolution rate compared with participants who did not receive it is an association, not proof of benefit. Some eye movement measurements were missed because participants closed their eyes, including 7 participants for Dix-Hallpike latency and duration and 31 participants when sitting up. The study was sized for nystagmus during the modified Epley maneuver, not for latency, duration, or residual dizziness, so those questions were not the main target of the sample size calculation.
Declared interests
The authors declared no conflicts of interest.
The easy way to misread this
Do not treat 360° rotation as an established alternative for people who do not respond to the modified Epley maneuver. The study was not randomised, and the rotation group had already failed the Epley maneuver, so the result is an association rather than proof of benefit.