Benign Paroxysmal Positional Vertigo (BPPV)

1. Topic Overview

Summary

Benign Paroxysmal Positional Vertigo (BPPV) is the most common cause of peripheral vertigo, accounting for approximately 17-42% of all patients presenting with vestibular symptoms. [1,2] It is characterized by recurrent, brief episodes of vertigo triggered by changes in head position relative to gravity. The underlying mechanism involves displacement of otoconia (calcium carbonate crystals) from the utricular macula into one of the semicircular canals, most commonly the posterior semicircular canal (80-90% of cases). [1,3]

The pathophysiology is understood through two distinct mechanisms: canalithiasis (free-floating otoconia within the canal lumen) and cupulolithiasis (otoconia adherent to the cupula). [4] Canalithiasis accounts for the majority of cases and produces the classic crescendo-decrescendo nystagmus pattern, while cupulolithiasis results in more persistent symptoms. [3]

Diagnosis is clinical, established through provocation testing with the Dix-Hallpike manoeuvre (for posterior and anterior canal BPPV) or the Supine Roll Test (for horizontal canal BPPV). [1,5] The characteristic findings include upbeat-torsional nystagmus with latency, crescendo-decrescendo pattern, and fatigability. Treatment with canalith repositioning procedures (CRPs) such as the Epley manoeuvre achieves resolution in 80-95% of cases, making BPPV one of the most successfully treatable vestibular disorders. [6,7]

Key Facts

Clinical Pearls

"Brief is Benign": BPPV episodes last seconds to under 60 seconds. Continuous vertigo for hours or days suggests vestibular neuritis, Meniere's disease, or central pathology. Duration is the key discriminator. [1]

"Dix-Hallpike is Diagnostic, Not Just Provocative": A positive Dix-Hallpike demonstrating upbeat-torsional nystagmus beating toward the dependent (affected) ear, with latency and fatigability, is pathognomonic for posterior canal BPPV. Imaging is not required. [5]

"Crystals Need Repositioning, Not Sedation": Vestibular sedatives (prochlorperazine, betahistine, cyclizine) do NOT treat the underlying pathology of BPPV. They may provide symptomatic relief but delay definitive treatment and can impair vestibular compensation. The Epley manoeuvre is treatment, not medication. [7,11]

"HINTS is for Continuous Vertigo, Not BPPV": The HINTS examination (Head Impulse, Nystagmus type, Test of Skew) differentiates peripheral from central causes in acute vestibular syndrome (continuous vertigo). It is not applicable to episodic positional vertigo. [12]

"The Posterior Canal is Lowest": When supine, the posterior semicircular canal is the most gravity-dependent, explaining why 80-90% of BPPV involves this canal. Otoconia settle here due to gravity. [3]

Why This Matters Clinically

BPPV represents a unique opportunity in medicine: a common, disabling condition that can be diagnosed and cured in a single consultation without investigations or medications. Recognition of the classic history, competent performance of diagnostic manoeuvres, and immediate treatment with canalith repositioning can transform patient quality of life within minutes.

Conversely, failure to recognize BPPV leads to:

• Inappropriate prescribing of vestibular sedatives
• Unnecessary imaging (CT/MRI)
• Repeated emergency presentations
• Delayed diagnosis and prolonged suffering
• Misdiagnosis as psychogenic or anxiety-related

Critically, clinicians must also recognize the limitations of the BPPV diagnosis and identify red flags that suggest central pathology, particularly posterior circulation stroke, which carries significant morbidity and mortality. [12,13]

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2. Epidemiology

Prevalence and Incidence

BPPV is the most common vestibular disorder, with a lifetime prevalence of approximately 2.4% and a one-year incidence of 0.6% (64 per 100,000 population). [1,2,8] Among patients presenting to dizziness clinics, BPPV accounts for 17-42% of diagnoses, making it the single most common diagnosis. [2]

Demographics

Risk Factors

Recurrence

BPPV has a high recurrence rate, which impacts long-term management and patient counselling:

Risk factors for recurrence:

• Older age (> 60 years)
• Female sex
• Secondary BPPV (post-traumatic, post-vestibular neuritis)
• Vitamin D deficiency
• Osteoporosis
• Meniere's disease
• Bilateral involvement

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3. Anatomy and Pathophysiology

Vestibular Anatomy

The Bony and Membranous Labyrinth

The inner ear contains the bony labyrinth, a series of cavities within the petrous temporal bone, and the membranous labyrinth suspended within it. The vestibular portion comprises:

1. Three Semicircular Canals (SCCs): Detect angular (rotational) acceleration

   • Anterior (Superior): Oriented 45° from sagittal plane
   • Posterior: Oriented 45° from sagittal plane, perpendicular to anterior
   • Horizontal (Lateral): Tilted 30° from horizontal when head is upright

2. Otolith Organs: Detect linear acceleration and gravity

   • Utricle: Horizontal orientation; detects horizontal translation
   • Saccule: Vertical orientation; detects vertical translation

Semicircular Canal Structure

Each semicircular canal has:

• Ampulla: Dilated end containing the crista ampullaris
• Crista ampullaris: Sensory epithelium with vestibular hair cells
• Cupula: Gelatinous structure that deflects with endolymph flow
• Canal lumen: Filled with endolymph (high K+, low Na+)

The canals form coplanar pairs that work in a push-pull manner:

• Right Anterior ↔ Left Posterior
• Left Anterior ↔ Right Posterior
• Right Horizontal ↔ Left Horizontal

Otolith Organ Structure

The utricular and saccular maculae contain:

• Hair cells: Type I (flask-shaped) and Type II (cylindrical)
• Otolithic membrane: Gelatinous layer covering hair cells
• Otoconia (Otoliths): Calcium carbonate crystals (3-30 μm) embedded in otolithic membrane
• Striola: Line of polarity reversal on the macula

Otoconia Composition:

• Calcium carbonate (CaCO3) in calcite form
• Protein matrix (otoconin-90, otolin-1)
• Total of 170,000-340,000 otoconia per macula
• Continuously remodelled throughout life

Pathophysiology of BPPV

BPPV occurs when otoconia become dislodged from the utricular macula and migrate into a semicircular canal. Two pathophysiological mechanisms are recognized:

Canalithiasis (> 90% of cases)

Mechanism:

1. Otoconia dislodge from the utricular macula (due to trauma, degeneration, or spontaneously)
2. Free-floating particles settle in the dependent portion of a semicircular canal
3. When head position changes, gravity causes otoconia to move within the canal
4. Moving otoconia create a "plunger effect," displacing endolymph
5. Endolymph flow deflects the cupula inappropriately
6. Cupula deflection stimulates vestibular hair cells
7. Asymmetric vestibular input creates vertigo and nystagmus
8. Once otoconia settle to a new position, flow stops and symptoms resolve

Clinical Features of Canalithiasis:

• Latency (1-5 seconds) before nystagmus onset
• Crescendo-decrescendo pattern (builds then fades)
• Duration less than 60 seconds per episode
• Fatigability with repeated testing
• Reversing nystagmus when returning to sitting

Cupulolithiasis (less than 10% of cases)

Mechanism:

1. Otoconia adhere directly to the cupula (rather than floating freely)
2. The cupula becomes density-weighted (otoconial mass)
3. Cupula now responds to gravity (normally gravity-insensitive)
4. Head position changes cause sustained cupula deflection
5. Symptoms persist as long as provocative position is maintained

Clinical Features of Cupulolithiasis:

• Minimal or absent latency
• Persistent nystagmus while in provocative position
• Less fatigable
• Duration can exceed 60 seconds
• May be more refractory to standard CRPs [4]

Canal-Specific Pathophysiology

Posterior Canal BPPV (80-90%)

The posterior semicircular canal (PSC) is most commonly affected because:

• It is the most gravity-dependent canal when supine
• The common crus connects it to the utricle, allowing easy otoconia migration
• Its orientation means dislodged otoconia naturally settle here

Ampullofugal flow (away from ampulla) in the PSC is excitatory, causing:

• Upbeating nystagmus (vertical component toward forehead)
• Torsional nystagmus beating toward the affected (dependent) ear
• Combined: Upper pole of eye beats toward the affected ear while also beating up

Horizontal (Lateral) Canal BPPV (5-15%)

Horizontal canal BPPV presents in two variants:

1. Geotropic Variant (Canalithiasis) - Most Common:

• Otoconia in the long arm of the horizontal canal
• Head turning causes particles to move toward cupula (ampullopetal flow)
• Ampullopetal flow in horizontal canal is excitatory
• Nystagmus beats toward the ground on both sides
• Affected side = stronger nystagmus (because particles are closer to cupula)

2. Apogeotropic Variant (Cupulolithiasis or Short Arm Canalithiasis):

• Otoconia attached to cupula OR in short arm of canal
• Nystagmus beats away from the ground on both sides
• Unaffected side = stronger nystagmus
• More refractory to treatment [3,5]

Anterior Canal BPPV (1-2%)

• Rare due to anterior canal's superior orientation
• Otoconia tend to migrate out easily with head movement
• When present: Downbeating + torsional nystagmus
• Often iatrogenic (occurs during Epley for posterior canal)
• Usually self-resolves or responds to reverse Epley [3]

Ewald's Laws

Understanding BPPV nystagmus requires knowledge of Ewald's three laws:

1. First Law: Nystagmus occurs in the plane of the stimulated canal
2. Second Law: In horizontal canals, ampullopetal flow > ampullofugal flow (excitation > inhibition)
3. Third Law: In vertical canals, ampullofugal flow > ampullopetal flow (excitation > inhibition)

These explain why:

• Posterior canal BPPV causes upbeat-torsional nystagmus (ampullofugal = excitatory)
• Horizontal canal BPPV (geotropic) causes horizontal nystagmus toward the ground (ampullopetal = excitatory)

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4. Clinical Presentation

Symptoms

Cardinal Symptoms

Typical Triggers

Absent Symptoms (Negative Features)

Signs

Nystagmus Characteristics

Posterior Canal BPPV (Dix-Hallpike Positive):

Horizontal Canal BPPV (Supine Roll Test):

Central vs Peripheral Nystagmus:

Natural History

• Spontaneous resolution: 20-30% resolve within 1 month without treatment
• Without treatment: Mean duration 39 days (range: days to years)
• With treatment: > 90% resolve after 1-3 CRPs
• Recurrence: 15-20% at 1 year, 37-50% at 5 years [9,10]

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5. Diagnosis

Diagnostic Criteria

BPPV diagnosis is clinical, based on:

1. History of brief, positional vertigo
2. Positive provocative testing with characteristic nystagmus
3. Absence of neurological signs

No investigations are required for typical presentations. [1,5]

The Dix-Hallpike Manoeuvre

Indication: Suspected posterior or anterior canal BPPV

Technique:

1. Position: Patient sits upright on examination couch, positioned so head will hang over the end
2. Head rotation: Turn head 45° toward the side being tested (this aligns the posterior canal with the sagittal plane)
3. Rapid descent: Supporting the patient's head, rapidly lower them backward to supine with the head hanging 20-30° below horizontal
4. Observation: Watch the eyes for nystagmus; ask about vertigo
5. Timing: Maintain position for at least 30 seconds (nystagmus may be delayed)
6. Return: Slowly bring patient back to sitting; observe for reversal nystagmus
7. Repeat: Test the opposite side

Interpretation:

Sensitivity and Specificity:

• Sensitivity: 79-82% [5]
• Specificity: 71-75% [5]
• Positive predictive value: 83%
• Note: Some patients have resolved BPPV or subliminal otoconia load

Contraindications/Cautions:

• Severe cervical spine disease (modify technique)
• Cervical radiculopathy
• Recent neck surgery
• Vertebrobasilar insufficiency (controversial)
• Carotid stenosis (controversial)

The Supine Roll Test (Pagnini-McClure Test)

Indication: Suspected horizontal canal BPPV (horizontal nystagmus on Dix-Hallpike, history suggestive of horizontal canal involvement)

Technique:

1. Position: Patient lies supine with head in neutral position
2. First roll: Rapidly turn head 90° to one side
3. Observation: Observe for horizontal nystagmus; note direction and intensity
4. Return: Return head to neutral
5. Second roll: Rapidly turn head 90° to the opposite side
6. Comparison: Compare nystagmus direction and intensity on both sides

Interpretation:

Key Points:

• Geotropic is more common and easier to treat
• Apogeotropic is more refractory
• If nystagmus is equal bilaterally, localisation is difficult

Side-Lying Test (Alternative to Dix-Hallpike)

For patients who cannot tolerate Dix-Hallpike:

1. Patient sits sideways on couch
2. Turn head 45° away from side being tested
3. Rapidly lower patient onto their side (ear toward couch)
4. Observe for nystagmus

Similar sensitivity to Dix-Hallpike; useful for patients with limited neck mobility.

Frenzel Goggles

• Magnify 20x while blocking visual fixation
• Enhance nystagmus detection (peripheral nystagmus is suppressed by fixation)
• Not essential but improve sensitivity
• Video recording with infrared allows slow-motion analysis

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6. Investigations

When Are Investigations Required?

Investigations are NOT indicated for typical BPPV with:

• Classic history (brief, positional vertigo)
• Positive Dix-Hallpike with peripheral nystagmus characteristics
• No red flags

Investigations ARE indicated for:

Audiometry

• Normal in BPPV (no sensorineural hearing loss)
• Abnormal suggests alternative diagnosis (Meniere's, labyrinthitis, acoustic neuroma)

Videonystagmography (VNG)

• Formal vestibular function testing
• Useful for atypical cases or refractory BPPV
• Can identify subtle nystagmus missed clinically
• Documents canal involvement for subspecialist review

Imaging

Important: MRI with DWI is more sensitive than CT for posterior circulation stroke in acute vestibular syndrome. [12]

Blood Tests

• Generally not indicated for typical BPPV
• Consider vitamin D level if recurrent BPPV (treat if less than 25 nmol/L)
• Consider bone profile if osteoporosis suspected

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7. Differential Diagnosis

The Vertigo Differential

HINTS Examination (For Acute Vestibular Syndrome Only)

The HINTS exam differentiates peripheral from central causes in continuous vertigo, NOT episodic positional vertigo (BPPV).

HINTS sensitivity for stroke: 98% (vs CT 16%) [12]

Mnemonic: HINTS INFARCT = Impulse Normal, Fast-phase Alternating, Refixation on Cover Test

When to Suspect Central Pathology

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8. Management

Principles

1. Diagnose: Confirm with Dix-Hallpike or Supine Roll Test
2. Treat immediately: Canalith repositioning procedure (CRP) same visit
3. Educate: Explain mechanism, prognosis, recurrence
4. Avoid medications: Vestibular sedatives delay compensation
5. Follow-up: Reassess if symptoms persist; teach self-treatment

Canalith Repositioning Procedures

The Epley Manoeuvre (Posterior Canal)

Indication: Posterior canal BPPV (positive Dix-Hallpike)

Mechanism: Uses gravity to move otoconia through the posterior canal, around the common crus, and into the utricle where they can be reabsorbed.

Technique (Right Posterior Canal):

1. Start: Patient sits upright, head turned 45° to RIGHT (affected side)
2. Position 1: Lower patient rapidly backward (as Dix-Hallpike), head hanging 20° below horizontal, head still 45° right. Hold 30-60 seconds (until nystagmus stops + 30s)
3. Position 2: Rotate head 90° to the LEFT (head now 45° left of midline, still hanging). Hold 30-60 seconds
4. Position 3: Roll patient onto LEFT side, rotating head further so nose points toward floor (135° from start). Hold 30-60 seconds
5. Position 4: Patient sits up slowly while maintaining head rotation, chin tucked
6. End: Bring head to neutral

Efficacy:

• Single Epley: 70-80% success [6,7]
• Two-three Epleys: > 90% success [6]
• NNT = 2-3 [7]

Cochrane Evidence: "There is evidence that the Epley manoeuvre is a safe, effective treatment for posterior canal BPPV"

• OR 4.4 (95% CI: 2.5-7.5) for resolution vs sham. [7]

The Semont Manoeuvre (Liberatory Manoeuvre)

Indication: Alternative for posterior canal BPPV; may be preferred for cupulolithiasis

Technique (Right Posterior Canal):

1. Start: Patient sits upright, head turned 45° to LEFT (away from affected side)
2. Position 1: Patient lies rapidly onto RIGHT side (affected side), nose facing upward. Hold 30 seconds-2 minutes
3. Position 2: Rapidly swing patient 180° to lie on LEFT side (nose now facing floor). Hold 30 seconds-2 minutes
4. End: Return slowly to sitting

Mechanism: Rapid movement generates inertia that dislodges otoconia from cupula (cupulolithiasis) or moves them through canal.

Efficacy: Similar to Epley (75-95%) [6]

The BBQ Roll (Lempert/Barbecue Manoeuvre)

Indication: Geotropic horizontal canal BPPV

Technique (Right Horizontal Canal Affected):

1. Start: Patient lies supine
2. Position 1: Turn head 90° to LEFT (unaffected side). Hold 30 seconds
3. Position 2: Roll body to LEFT (patient now prone, head 180° from start). Hold 30 seconds
4. Position 3: Continue rolling LEFT (patient now on left side). Hold 30 seconds
5. Position 4: Continue rolling to supine, then sit up slowly

Mechanism: Rolls otoconia around horizontal canal toward utricle

Efficacy: 60-90% [3,16]

The Gufoni Manoeuvre

Indication: Horizontal canal BPPV (both geotropic and apogeotropic variants)

For Geotropic HC-BPPV (Right Side):

1. Patient sits on couch
2. Rapidly lie onto LEFT side (unaffected side). Hold 1-2 minutes
3. Quickly turn head 45° down (nose toward ground). Hold 2 minutes
4. Return to sitting

For Apogeotropic HC-BPPV (Right Side):

1. Rapidly lie onto RIGHT side (affected side). Hold 1-2 minutes
2. Quickly turn head 45° UP (nose toward ceiling). Hold 2 minutes
3. Return to sitting

Efficacy: 70-90% [16]

Brandt-Daroff Exercises (Habituation Therapy)

Indication:

• Self-treatment for recurrent BPPV
• After CRP when resolution incomplete
• Patient preference/education

Technique:

1. Sit on edge of bed
2. Rapidly lie onto ONE side, with head turned 45° toward ceiling
3. Stay 30 seconds OR until vertigo resolves + 30 seconds
4. Return to sitting. Wait 30 seconds
5. Rapidly lie onto OTHER side. Stay 30 seconds
6. Return to sitting. Wait 30 seconds
7. Repeat 5-10 times, 3 times per day, for 2 weeks

Mechanism: Habituation (central compensation) and repositioning

Efficacy: 25-95% (variable evidence quality) [7]

Post-Manoeuvre Restrictions

Historical Recommendations (Largely Abandoned):

• Sleep upright 45° for 48 hours
• Avoid lying on affected side for 1 week
• Avoid head-down positions

Current Evidence:

• Post-treatment position restrictions do NOT improve outcomes [7,17]
• AAO-HNSF guidelines do NOT recommend routine restrictions [1]
• Individual clinician preference may still apply

Medication: What NOT to Prescribe

When Medications MAY Be Appropriate:

• Severe nausea/vomiting: Short-term antiemetic (1-3 days maximum)
• Acute anxiety: Short-term anxiolytic may help compliance with CRP
• Always emphasize CRP is the treatment

Refractory BPPV

Definition: Failure to respond to 3 or more appropriately performed CRPs

Management:

1. Confirm diagnosis: Is this truly BPPV? Consider VNG, MRI
2. Identify canal correctly: Re-evaluate with Frenzel goggles, consider horizontal canal involvement
3. Consider cupulolithiasis: Try Semont manoeuvre, prolonged positioning
4. ENT/Vestibular specialist referral
5. Vestibular rehabilitation therapy (VRT)

Surgical Options for Intractable BPPV

Indications:

• Severe, disabling BPPV refractory to multiple CRPs (> 6 months)
• Significantly impaired quality of life
• Failure of conservative measures
• Rare (less than 1% of BPPV patients require surgery) [18]

Procedures:

Posterior Semicircular Canal Occlusion:

• Most commonly performed surgical procedure for refractory BPPV
• Blue-line the membranous canal via mastoidectomy
• Pack with bone dust/chips and fibrin glue
• Success rate: 85-100% [18]
• Hearing preservation: 92-100%
• Vertigo cure: 94%

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9. Special Populations

Elderly Patients

Children

• BPPV is rare in children (less than 1% of paediatric vertigo)
• When present, consider:
  • Head trauma (most common cause)
  • Vestibular migraine (more common cause of paediatric vertigo)
  • Congenital inner ear malformations
• Diagnosis and treatment similar to adults
• May need parental assistance with exercises

Pregnancy

• BPPV can occur during pregnancy (hormonal changes)
• Dix-Hallpike and Epley are safe in pregnancy
• Avoid supine hypotension (left lateral tilt if needed)
• No medications recommended

Post-Surgical

• Common after ear surgery (stapedectomy, cochlear implant)
• Usually self-resolves
• Treat with standard CRPs if persistent

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10. Prognosis and Outcomes

Short-Term Outcomes

Long-Term Outcomes

Prognostic Factors

Favorable:

• Idiopathic BPPV
• Young age
• Posterior canal involvement
• First episode
• Normal vitamin D levels

Unfavorable (Higher Recurrence):

• Secondary BPPV (post-traumatic, post-vestibular neuritis)
• Older age
• Female sex
• Vitamin D deficiency
• Osteoporosis
• Meniere's disease
• Horizontal canal involvement

Quality of Life

• BPPV significantly impairs quality of life during active episodes
• 86% report impact on daily activities
• 28% take time off work
• Anxiety about recurrence is common
• Full functional recovery expected with treatment

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11. Complications

Canal Conversion

• Otoconia move from one canal to another during CRP
• Most common: Posterior → Horizontal canal during Epley
• Presents as new horizontal nystagmus after Epley
• Management: Identify involved canal, perform appropriate CRP

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12. Prevention and Screening

Primary Prevention

No proven primary prevention strategies, but consider:

• Vitamin D optimization: Maintain levels > 50 nmol/L
• Falls prevention (reduces head trauma)
• Osteoporosis treatment (reduces otoconia degeneration)

Secondary Prevention (Reducing Recurrence)

Screening

No population screening indicated. Screen high-risk groups if symptomatic:

• Post-head trauma
• Post-vestibular neuritis (screen at 3 months)
• Meniere's disease patients with new symptoms

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13. Key Guidelines

AAO-HNSF Key Recommendations [1]

Strong Recommendations:

• Clinicians SHOULD diagnose posterior canal BPPV with Dix-Hallpike
• Clinicians SHOULD treat posterior canal BPPV with CRP (Epley)
• Clinicians SHOULD NOT routinely request imaging for classic BPPV

Recommendations:

• Clinicians SHOULD differentiate BPPV from other causes of dizziness
• Clinicians SHOULD evaluate for horizontal canal BPPV if posterior canal testing negative
• Clinicians SHOULD reassess within 1 month if no improvement

Against Recommendations:

• Clinicians SHOULD NOT prescribe vestibular-suppressant medications
• Clinicians SHOULD NOT routinely prescribe post-manoeuvre postural restrictions

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14. Exam Scenarios and Viva Points

Viva Opening Statement

"BPPV is the most common cause of peripheral vertigo, affecting approximately 2.4% of the population lifetime. It is caused by otoconia dislodging from the utricular macula and migrating into a semicircular canal, most commonly the posterior canal in 80-90% of cases. The hallmark is brief, positional vertigo lasting less than 60 seconds, diagnosed by the Dix-Hallpike manoeuvre and treated with canalith repositioning procedures such as the Epley manoeuvre, which has over 90% success rate."

Common Exam Questions

Q1: "Describe the pathophysiology of BPPV."

"BPPV results from otoconia—calcium carbonate crystals normally embedded in the utricular macula—becoming dislodged and migrating into a semicircular canal. Two mechanisms are recognized:

Canalithiasis (> 90%): Free-floating otoconia within the canal lumen. When the head moves, otoconia move under gravity, creating a plunger effect that displaces endolymph and deflects the cupula. This causes inappropriate vestibular stimulation with vertigo and nystagmus. Features include latency (1-5 seconds), crescendo-decrescendo pattern, duration under 60 seconds, and fatigability.

Cupulolithiasis (less than 10%): Otoconia adhere directly to the cupula, making it gravity-sensitive. This causes persistent symptoms while in the provocative position, with less fatigability.

The posterior canal is most commonly affected (80-90%) as it is the most gravity-dependent canal when supine, facilitating otoconia accumulation."

Q2: "How do you differentiate posterior from horizontal canal BPPV?"

"I differentiate by the provoking test and nystagmus characteristics:

Posterior Canal: Diagnosed with the Dix-Hallpike manoeuvre. Positive test shows upbeat-torsional nystagmus beating toward the dependent (affected) ear, with latency, crescendo-decrescendo pattern, and duration under 60 seconds.

Horizontal Canal: Diagnosed with the Supine Roll Test. The head is turned 90° to each side while supine. Two patterns exist:

• Geotropic (toward ground): Horizontal nystagmus beats toward the ground on both sides; stronger on the affected side. Indicates canalithiasis in the long arm.
• Apogeotropic (away from ground): Beats away from ground on both sides; stronger on the unaffected side. Indicates cupulolithiasis or short-arm canalithiasis."

Q3: "What are the red flags that would concern you for a central cause?"

"Red flags for central pathology include:

1. Vertical or pure torsional nystagmus (vertical nystagmus suggests brainstem/cerebellar lesion)
2. Direction-changing nystagmus (not explainable by single peripheral lesion)
3. No latency (central nystagmus is immediate)
4. Non-fatigable nystagmus (peripheral fatigues with repetition)
5. Continuous vertigo for hours/days (BPPV is episodic)
6. Normal head impulse test with acute vestibular syndrome (HINTS suggests stroke)
7. Focal neurological signs: diplopia, dysarthria, dysphagia, ataxia
8. New-onset headache
9. Severe imbalance (unable to sit unsupported suggests cerebellar stroke)

If any of these are present, I would not diagnose BPPV and would pursue urgent imaging (MRI with DWI) and neurology input."

Q4: "Describe how you would perform the Epley manoeuvre."

"For right posterior canal BPPV:

1. Position 1: Patient sits upright, head turned 45° to the right. Rapidly lower backward into Dix-Hallpike position (head hanging 20° below horizontal), maintain for 30-60 seconds until nystagmus stops plus an additional 30 seconds.

2. Position 2: Rotate head 90° to the left (now 45° left of midline), keeping head extended. Hold 30-60 seconds.

3. Position 3: Roll the patient onto their left side while rotating the head further, so the nose points 45° toward the floor. Hold 30-60 seconds.

4. Position 4: Keeping the head turned left, bring the patient to sitting slowly.

5. Bring head to neutral.

Success rate is 70-80% with a single Epley, rising to over 90% with 2-3 manoeuvres. The NNT is 2-3."

Q5: "A patient asks for 'those tablets' because they worked before for their dizziness. How do you respond?"

"I would acknowledge their previous experience but explain that vestibular sedatives like prochlorperazine do not treat BPPV—they may provide temporary symptom relief by sedating the vestibular system, but they do not address the underlying cause (displaced otoconia) and can actually delay recovery by impairing vestibular compensation.

The treatment for BPPV is a physical repositioning manoeuvre—the Epley manoeuvre—which physically moves the crystals out of the semicircular canal. This has a 90% cure rate and can resolve symptoms immediately. I would offer to perform this now, explaining that this is the evidence-based treatment recommended by guidelines, not medication."

Model Answer: OSCE Station

Scenario: 58-year-old woman presents with 3-day history of vertigo. Perform an appropriate examination and discuss your findings.

Approach:

"Good morning, I'm Dr. X. I understand you've been experiencing dizziness. Before I examine you, may I ask a few questions?

(History: Brief (less than 1 minute) spinning when rolling over in bed, no hearing loss, no headache, no neurological symptoms)

Based on your history of brief, positional vertigo, I suspect you may have BPPV. With your permission, I'd like to perform a test called the Dix-Hallpike manoeuvre to confirm this diagnosis.

(Explain procedure, obtain consent, position patient)

I'm going to turn your head 45° to the right, then lower you backward quickly. You may experience vertigo—this is expected and will pass within a minute. Please keep your eyes open so I can observe them.

(Perform Dix-Hallpike: observe upbeat-torsional nystagmus toward right ear after 3-second latency, lasting 25 seconds, patient reports vertigo)

Findings to examiner: This is a positive Dix-Hallpike. I observed upbeat-torsional nystagmus beating toward the right ear with 3-second latency, lasting approximately 25 seconds with a crescendo-decrescendo pattern. The patient reported vertigo. This confirms right posterior canal BPPV.

(Perform Epley manoeuvre, explain each step)

Counselling: 'You have a condition called BPPV—benign paroxysmal positional vertigo. Tiny crystals in your inner ear have moved into one of the balance canals. I've just performed a repositioning manoeuvre to move them back.

This works in about 90% of people. You may feel slightly off-balance for a day or two. There's about a 15-20% chance it could come back within a year, but we can treat it again if it does.

I do NOT recommend any tablets for this—the manoeuvre is the treatment. If symptoms persist beyond a week, please return.'"

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15. Quality Markers and Audit Standards

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16. Patient/Layperson Explanation

What is BPPV?

BPPV stands for Benign Paroxysmal Positional Vertigo. Let me break that down:

• Benign: Not dangerous
• Paroxysmal: Comes in sudden, brief attacks
• Positional: Triggered by head position changes
• Vertigo: Spinning sensation

It's the most common cause of vertigo, affecting about 1 in 40 people at some point in their lives.

What Causes It?

Inside your inner ear are tiny crystals (called otoconia) that normally help you sense gravity. In BPPV, some of these crystals become dislodged and fall into the balance canals. When you move your head, these loose crystals roll around and send false signals to your brain, causing the spinning sensation.

What Are the Symptoms?

• Brief episodes of intense spinning, usually lasting less than a minute
• Triggered by specific movements: rolling over in bed, looking up, bending down
• Nausea (may vomit if severe)
• No hearing loss
• Feeling off-balance between attacks

How Is It Diagnosed?

Your doctor will do a simple test called the Dix-Hallpike manoeuvre. They'll turn your head and quickly lower you backward while watching your eyes for specific movements (nystagmus). This can diagnose BPPV without scans or blood tests.

How Is It Treated?

Treatment is a physical manoeuvre called the Epley manoeuvre. Your doctor will guide your head through specific positions to roll the crystals out of the balance canal. It works in about 90% of people and can be done in the clinic.

Important: Tablets like anti-sickness pills do NOT fix BPPV. The crystals need to be physically moved back into place.

Will It Come Back?

BPPV can recur. About 1 in 5 people will have another episode within a year, and about half within 5 years. If it comes back, you can be treated again. Your doctor can also teach you exercises (Brandt-Daroff) to do at home.

When Should I Worry?

Seek urgent medical attention if you have:

• Continuous spinning that doesn't stop
• New headache with dizziness
• Double vision, slurred speech, difficulty swallowing
• Numbness or weakness
• Hearing loss

These could suggest a more serious cause that needs different treatment.

Key Takeaways

1. BPPV is common and not dangerous
2. Episodes are brief (less than 1 minute) and triggered by head position
3. Diagnosed with a simple bedside test
4. Treated with a repositioning manoeuvre, not pills
5. 90% success rate with treatment
6. May recur but can be treated again

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17. Historical Context

Discovery and Development

• 1921: Robert Bárány described positional vertigo and nystagmus
• 1952: Margaret Dix and Charles Hallpike described the diagnostic manoeuvre and proposed cupulolithiasis theory
• 1969: Harold Schuknecht proposed canalithiasis as the mechanism
• 1980: John Epley developed the canalith repositioning procedure
• 1988: Alain Semont described the liberatory manoeuvre

The Epley Story

Dr. John Epley, an American ENT surgeon in Portland, Oregon, developed the Epley manoeuvre in 1980. Despite clear anatomical reasoning and clinical success, the procedure was initially met with significant skepticism:

• The canalithiasis theory was not universally accepted
• Colleagues questioned whether otoconia could float freely in canals
• Initial publications were rejected or met with derision

Validation came through:

• Histopathological studies confirming free-floating otoconia in canals
• Multiple randomized controlled trials demonstrating efficacy
• Cochrane review confirming benefit (OR 4.4 vs sham)

Today, the Epley manoeuvre is the gold standard treatment for posterior canal BPPV, taught worldwide, and practiced by primary care physicians, emergency doctors, and specialists alike.

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18. Evidence Summary Table

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19. References

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Medical Disclaimer: MedVellum content is for educational purposes and clinical reference. Always apply clinical judgement to individual patients. If you are experiencing dizziness or vertigo, please consult a healthcare professional.