BPPV Posterior Canal: Dix-Hallpike Test, Geotropic Nystagmus & Canalith Repositioning (Epley) Maneuver
In short
Sudden violent spinning when rolling over in bed is most frequently posterior canal BPPV. Discover how vestibular physiotherapists diagnose and cure vertigo with the Epley maneuver.
In this guide (5 sections)
Pathophysiology of Posterior Canal BPPV
Benign Paroxysmal Positional Vertigo (BPPV) accounts for more than 50 percent of all peripheral vestibular presentations in neuro-otology clinics. It occurs when calcium carbonate crystals (otoconia) detach from the gelatinous otolithic membrane of the utricle and migrate aberrantly into one of the three fluid-filled semicircular canals.
The posterior semicircular canal is the culprit in 85 to 90 percent of BPPV cases due to its gravity-dependent anatomical orientation at the base of the temporal bone. When the patient tilts their head back or rolls over, the dense otoliths move through the endolymph under gravity (canalithiasis), deflecting the cupula and generating false rotational neural firing.
The Gold Standard Diagnostic: The Dix-Hallpike Test
Diagnosis requires performing the Dix-Hallpike test. The patient sits long-ways on the examination table with the head turned 45 degrees toward the test ear, and is rapidly brought down into a supine position with the neck extended 20 degrees over the table edge.
A positive test exhibits a classic torsional (top pole beating toward the down-ear) and upbeating nystagmus with a characteristic latency of 2 to 10 seconds, crescendo-decrescendo intensity, and fatigue within 30 to 60 seconds.
| Diagnostic Feature | Canalithiasis (Free-Floating) | Cupulolithiasis (Adherent) | |
|---|---|---|---|
| Onset Latency | 2 to 10 seconds delay after head movement | Immediate onset with zero latency | |
| Nystagmus Vector | Torsional (upper pole to lower ear) + Upbeating | Persistent torsional + upbeating nystagmus | |
| Duration of Vertigo | Transient (< 60 seconds duration) | Sustained (> 60 seconds; lasts while head held) | |
| Primary Intervention | Canalith Repositioning Procedure (Epley Maneuver) | Semont Liberatory Maneuver or rapid vibration |
Step-by-Step Epley Maneuver Protocol
The Epley maneuver utilizes gravity to guide the free-floating crystals around the arc of the posterior canal back into the utricle, where macrophages safely resorb them.
Each position must be held for 30 to 60 seconds (or until nystagmus ceases completely).
- Position 1: Dix-Hallpike Position: Head turned 45 degrees to the affected side, neck extended 20 degrees off the bed edge; wait for nystagmus to clear.
- Position 2: 90-Degree Head Rotation: Rotate the head 90 degrees to the opposite (unaffected) side, maintaining 20 degrees of extension.
- Position 3: Body Roll to Lateral Decubitus: Roll the patient onto their side, turning the head another 90 degrees so the nose points 45 degrees downward toward the floor.
- Position 4: Guided Sitting Up: Bring the patient up into sitting with the head tilted slightly forward, keeping chin tucked.
Post-Maneuver Precautions: Modern Scientific Consensus
Historic advice requiring patients to sleep upright in a recliner for 48 hours has been disproven by modern clinical trials. Modern clinical practice guidelines advise normal sleeping positions immediately, noting an 85 to 95 percent single-session cure rate.
Frequently Asked Questions
Can I do the Epley maneuver by myself at home?
Performing self-treatment without professional diagnosis is risky because an incorrect maneuver can accidentally displace otoconia into the horizontal canal, causing severe lateral canal vertigo. Initial diagnosis should always be guided by a vestibular physiotherapist.
Why do I feel lightheaded or off-balance even after the spinning stopped?
After successful crystal repositioning, mild otolithic residual dizziness is common for 3 to 7 days as the brain recalibrates balance inputs. Gentle walking exercises accelerate recovery.
Do medications like cinnarizine or betahistine cure BPPV?
No. Vestibular suppressant medications temporarily mask nausea symptoms but cannot move physical calcium crystals out of the canal. The Epley repositioning maneuver is the true mechanical cure.
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