- Design
- Nationwide propensity-matched case-control study
- Population
- 120,774 adults with new peripheral vestibulopathy and 483,096 controls, Taiwan
- Primary outcome
- Prior atrial fibrillation
- Effect
- 1.53% vs 1.28%; adjusted OR 1.21 (1.15 to 1.28)
This Taiwanese case-control study used national insurance data to compare 120,774 adults newly diagnosed with peripheral vestibulopathy between 2016 and 2021 with 483,096 matched controls. Prior atrial fibrillation was more common in cases (1.53% vs 1.28%; adjusted OR 1.21, 95% CI 1.15 to 1.28).
The association held for BPPV (OR 1.19) and unspecified peripheral vestibulopathy (OR 1.28), but not for vestibular neuritis or Menière's disease.
The absolute difference is small, and the study cannot say why. One uncomfortable possibility is misclassification: some patients with atrial fibrillation labelled as unspecified peripheral vertigo may in fact have had posterior circulation ischaemia. That is a reason for careful examination rather than a reason to screen every dizzy patient for arrhythmia.
- In a dizzy patient with atrial fibrillation, examine carefully before accepting a peripheral diagnosis
- Confirm BPPV with a positional test rather than labelling vertigo by history alone
- Use HINTS or refer urgently when acute continuous vertigo has any central feature
- Check anticoagulation status in patients with atrial fibrillation presenting with vertigo
Why it matters
A vague peripheral label in a patient with atrial fibrillation may hide a stroke.
Don't overread it
An association in claims data; it does not show that atrial fibrillation causes vestibular disease.
The statistics, in plain English
An adjusted odds ratio of 1.21 is a small effect. With 600,000 people, even small differences reach significance; the absolute gap was 0.25 percentage points.
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