BPPV: A Clinician's Complete Guide to Diagnosis and Treatment

Benign Paroxysmal Positional Vertigo is the most common vestibular disorder you will encounter in clinical practice, accounting for roughly 20–30% of all dizziness presentations. Despite being highly treatable — often within a single session — BPPV remains one of the most mismanaged conditions in primary care. Many patients spend months or years being told their dizziness is anxiety, low blood pressure, or simply 'something to live with' before a skilled clinician finally performs a Dix-Hallpike.

This guide is written for practising physiotherapists and chiropractors who want a rigorous, systematic approach to BPPV — from the anatomy that makes it tick, to the canal-specific repositioning manoeuvres that resolve it, to the clinical traps that catch even experienced clinicians off guard.

The Anatomy That Drives Everything

The vestibular labyrinth contains three semicircular canals — posterior, anterior (superior), and horizontal (lateral) — each filled with endolymph and each sensitive to angular acceleration in its own plane. At the base of each canal sits the cupula, a gelatinous flap that deflects with endolymph movement and triggers afferent firing to the vestibular nuclei.

BPPV occurs when otoconia — calcium carbonate crystals normally embedded in the utricular macula — break free and migrate into one of the semicircular canals. The result is pathological cupular deflection with changes in head position, producing brief, intense, positional vertigo.

Canal-by-Canal Breakdown

Posterior Canal BPPV (canalolithiasis)

The most common variant. Debris floats freely within the posterior canal (canalolithiasis), deflecting the cupula ampullofugally with the Dix-Hallpike manoeuvre.

Classic Dix-Hallpike findings for right posterior canal BPPV:

• •Upbeat-torsional nystagmus, with the upper pole of the eye beating toward the affected (down) ear
• •Latency of 1–5 seconds before nystagmus onset
• •Duration of less than 60 seconds
• •Fatigability with repeated testing
• •Reversal of nystagmus on return to sitting

Horizontal Canal BPPV

Accounts for 5–10% of cases and is the second most common variant. It presents quite differently from posterior canal BPPV and is frequently missed by clinicians who default straight to Dix-Hallpike without a full canal assessment.

Use the Supine Roll Test. Key distinguishing features:

• •Direction-changing horizontal nystagmus provoked by turning the head in supine
• •Geotropic (toward ground) = canalolithiasis; ageotropic (away from ground) = cupulolithiasis
• •Intensity is greater toward the affected ear in canalolithiasis
• •No latency — nystagmus is immediate and sustained (especially cupulolithiasis)

Your Diagnostic Protocol

A systematic assessment prevents canal confusion, missed bilateral cases, and the embarrassing situation of treating the wrong side.

• •Step 1 — Subjective history: onset, duration of each episode, provocative positions, history of head trauma or prolonged recumbency
• •Step 2 — Posterior canal screen: Dix-Hallpike to right and left. Document nystagmus direction, latency, and duration
• •Step 3 — Horizontal canal screen: Supine Roll Test. Compare intensity side to side
• •Step 4 — Rule out central mimics: HINTS exam, direction-changing nystagmus in primary gaze, smooth pursuit, skew deviation
• •Step 5 — Confirm side and canal before treating. Never assume

Canal Repositioning: The Evidence-Based Manoeuvres

Epley Manoeuvre — Posterior Canal BPPV

First-line treatment for posterior canal canalolithiasis. Success rates of 80–90% with a single treatment in experienced hands. The key is unhurried positioning — each head position should be held for at least 30–60 seconds, or until nystagmus fully resolves.

Barbecue Roll — Horizontal Canal Canalolithiasis

For geotropic horizontal nystagmus. The patient rolls in 90° increments away from the affected ear, completing a 270° arc. Hold each position until nystagmus resolves.

When It Doesn't Work

Treatment failures and recurrences are common — BPPV recurs in 15–37% of patients within one year. When repositioning fails, consider:

• •Wrong canal or side identified — reassess from scratch
• •Canal conversion — debris has migrated during treatment
• •Cupulolithiasis rather than canalolithiasis — requires a different manoeuvre class
• •Multi-canal involvement — check all canals before concluding treatment is complete
• •Central mimics — reassess for central vestibular pathology