Benign Paroxysmal Positional Vertigo (BPPV) – Posterior Canal Variant
Your symptoms—brief dizziness with vomiting that worsens when sitting up and improves when lying flat—are classic for posterior‑canal BPPV, the single most common cause of positional vertigo, accounting for 85–95 % of all BPPV cases. 1
Why This Is Almost Certainly BPPV
- Positional trigger pattern: Vertigo provoked by moving from lying to sitting (or vice versa) and relieved by remaining supine is the hallmark of posterior‑canal BPPV. 1
- Brief duration: Episodes lasting seconds to less than one minute (typically 10–20 seconds) distinguish BPPV from all other vestibular disorders. 1
- Nausea and vomiting: These accompany the brief vertigo spells in BPPV and do not indicate a dangerous cause. 1
- No hearing loss, tinnitus, or ear fullness: The complete absence of auditory symptoms rules out Ménière's disease, labyrinthitis, and superior canal dehiscence, leaving BPPV as the diagnosis. 1, 2
Immediate Diagnostic Confirmation – The Dix‑Hallpike Maneuver
Perform the Dix‑Hallpike test immediately to confirm the diagnosis; this is the gold‑standard bedside test endorsed by the American Academy of Otolaryngology–Head and Neck Surgery. 1
Technique (Step‑by‑Step)
- Seat the patient upright and rotate the head 45° toward the side you are testing (this aligns the posterior semicircular canal with the plane of movement). 1
- Rapidly lower the patient to supine with the head extended ≈20° off the table edge while maintaining the 45° rotation, keeping the tested ear down. 1
- Keep the patient's eyes open and observe for nystagmus for up to 60 seconds. 1
Positive Test Criteria (All Three Required)
- Torsional, up‑beating nystagmus directed toward the forehead (fast phase upward and rotating toward the affected ear). 1
- Latency of 5–20 seconds after completing the maneuver (occasionally up to 60 seconds). 1
- Crescendo‑decrescendo pattern that resolves within 60 seconds from nystagmus onset. 1
Critical Next Step if Negative
- Immediately repeat the Dix‑Hallpike on the opposite side before concluding BPPV is absent; the test has a sensitivity of only ≈82 % and a negative predictive value of ≈52 % in primary‑care settings, meaning roughly half of negative results are false‑negatives. 1
If Both Sides Are Negative
- Perform the supine roll test to assess for lateral‑canal BPPV (5–15 % of cases): with the patient supine and head neutral, rapidly turn the head 90° to each side and observe for direction‑changing horizontal nystagmus. 1
- Failure to perform the supine roll test after a negative Dix‑Hallpike misses lateral‑canal BPPV in 5–15 % of patients. 1
Immediate Treatment – Epley Canalith Repositioning Maneuver
The American Academy of Otolaryngology–Head and Neck Surgery gives a strong recommendation to perform the Epley maneuver immediately after a positive Dix‑Hallpike test; this resolves symptoms in ≈80 % of patients within 1–3 treatment sessions. 1
Five‑Step Epley Sequence
- Patient upright, head turned 45° toward the affected ear.
- Rapid transition to supine with head hanging 20° for 20–30 seconds.
- Head turned 90° toward the unaffected side for 20 seconds.
- Head turned an additional 90° (patient moves to lateral decubitus, face nearly down) for 20–30 seconds.
- Return to upright sitting. 1
Expected Sensations During the Maneuver
- Transient vertigo and nausea during the Epley maneuver are expected and do not signify complications. 1
Post‑Treatment Expectations
- Mild motion sensitivity and unsteadiness for days to weeks after successful repositioning are normal; most patients experience resolution within hours to days, although residual symptoms may persist briefly. 1
- These residual symptoms do NOT indicate treatment failure. 1
- No postural restrictions are required after the maneuver; patients may resume normal activities immediately. 1
What NOT to Do (Strong Recommendations Against)
- Do not prescribe meclizine, antihistamines, or benzodiazepines; randomized data show no benefit versus placebo (relative risk 0.63; 95 % CI 0.52–0.78). 1
- Do not order CT or MRI when diagnostic criteria for BPPV are met and no red‑flag features are present. 1
- Do not order vestibular function testing (videonystagmography, electronystagmography) in typical BPPV without atypical vestibular signs. 1
Red‑Flag Findings That Require Urgent Neuroimaging
If any of the following are present, order brain MRI immediately to exclude posterior‑circulation stroke or central pathology: 1
| Red‑Flag Sign | Clinical Implication |
|---|---|
| Down‑beating nystagmus on Dix‑Hallpike without a torsional component | Suggests central pathology |
| Direction‑changing nystagmus occurring without head‑position changes | Suggests central vestibular disorder |
| Gaze‑evoked nystagmus (beats in direction of gaze) | Central lesion suspicion |
| Dysarthria, dysmetria, dysphagia, focal motor/sensory deficits, Horner's syndrome | Immediate neuro‑imaging required |
| Hearing loss, tinnitus, or aural fullness | Excludes BPPV; points to Ménière's disease, labyrinthitis, or superior canal dehiscence |
| Failure to improve after appropriate canalith repositioning | Mandates imaging to exclude central pathology |
Follow‑Up Protocol
- Arrange a follow‑up visit within 1 month to document symptom resolution. 1
- If vertiginous symptoms persist beyond 2 weeks, repeat positional testing and consider vestibular rehabilitation or specialist referral. 1
Special Considerations
- Elderly patients or those with a prior fall history have a 12‑fold increased fall risk during symptomatic BPPV; prompt treatment is therefore essential. 1
- Refer to otolaryngology or neurology when patients have impaired mobility, coexisting central nervous system disorders, high fall risk, or symptoms lasting > 2 weeks despite appropriate canalith repositioning. 1
Common Pitfalls to Avoid
- Assuming a single negative Dix‑Hallpike excludes BPPV is incorrect; the test's negative predictive value is only ≈52 % in primary‑care settings. 1
- Skipping the supine roll test after a negative Dix‑Hallpike leads to missed lateral‑canal BPPV in 5–15 % of patients. 1
- Prescribing meclizine represents low‑value care with no proven benefit and potential adverse effects. 1
- Ordering brain imaging for typical BPPV without red‑flag features wastes resources and delays definitive treatment. 1