Benign Paroxysmal Positional Vertigo

Benign Paroxysmal Positional Vertigo

Benign Paroxysmal Positional Vertigo

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BPPV Basics - Crystal Chaos

  • Definition: Vestibular disorder: recurrent, brief vertigo with head position changes. Caused by otoconia (calcium carbonate crystals) displaced from utricle into semicircular canals.
  • Epidemiology: Most common peripheral vertigo, especially in older adults.
  • Pathophysiology:
    • Otoconia ("ear rocks") from the utricle dislodge.
    • Posterior Semicircular Canal (PSC) most affected due to gravity. 📌 Mnemonic: "P"osterior & "P"opular.
  • Types:
    • Canalithiasis: Free-floating otoconia in canal endolymph (more common).
    • Cupulolithiasis: Otoconia adhere to the cupula (rarer, more persistent).

Displaced otoconia in posterior semicircular canal

⭐ The posterior semicircular canal is most frequently affected in BPPV (approx. 80-90% of cases) due to its gravity-dependent position, facilitating otoconial settlement.

Clinical Clues - Spin Signals

  • Vertigo Profile:
    • Sudden, recurrent, brief episodes: <1 minute.
    • Triggers: Specific head position changes (e.g., rolling in bed, looking up/down, bending over).
  • Associated Symptoms:
    • Nausea/vomiting common.
    • ABSENT: Hearing loss, tinnitus, ear fullness, or focal neurological deficits. (Key differentiator!)
  • Diagnostic Maneuvers & Nystagmus:
    • Dix-Hallpike Test (for Posterior/Anterior Canals - PSC/ASC):
      • Procedure: Patient rapidly moved from sitting to supine with head extended (30-45°) and turned 45° to one side.
      • Positive (PSC BPPV): Latency (2-20 seconds), then characteristic nystagmus (torsional: rotatory towards affected/downward ear; vertical: upbeating). Nystagmus is fatigable with repetition and lasts <1 minute.
    • Supine Roll Test (Pagnini-McClure Maneuver) (for Horizontal Canal - HSC):
      • Procedure: Patient supine, head flexed 20-30°, head rapidly turned 90° to each side.
      • Nystagmus:
        • Geotropic: Horizontal nystagmus, beats towards the ground (indicates canalithiasis). Stronger on the affected side.
        • Ageotropic: Horizontal nystagmus, beats towards the sky/ceiling (indicates cupulolithiasis). Weaker on the affected side.

⭐ The classic nystagmus of posterior canal BPPV elicited by Dix-Hallpike is upbeating and torsional (towards the affected ear), with a latency of a few seconds and duration less than one minute.

Treatment Tactics - Stone Settlers

Mainstay: Canalith Repositioning Procedures (CRPs) - Relocate displaced otoconia.

  • Epley Maneuver: For Posterior Canal (PSC) canalithiasis. High success (e.g., >80%).
  • Semont Maneuver: For PSC cupulolithiasis/canalithiasis.
  • HSC Maneuvers:
    • Barbecue Roll (Lempert): HSC geotropic canalithiasis.
    • Gufoni/Appiani: HSC geotropic/apogeotropic variants.

Other Options:

  • Brandt-Daroff Exercises: Home exercises for residual symptoms or as alternative (less effective primary).
  • Pharmacotherapy (Limited): Symptomatic relief for severe nausea/vertigo (antiemetics, short-term vestibular suppressants). Not curative.
  • Surgery (Rare): For intractable cases (e.g., singular neurectomy, canal plugging).

Epley maneuver steps for BPPV treatment

⭐ The Epley maneuver is the most widely used and effective treatment for posterior canal BPPV (canalithiasis).

Beyond BPPV - Vertigo Variants

  • Differential Diagnoses (DDx):
    • Migrainous vertigo: Migraine Hx, assoc. symptoms.
    • Central (VBI, stroke): ⚠️ Red flags: persistent nystagmus, new neuro deficits (diplopia, ataxia).

Key Distinctions Table:

FeatureBPPVMeniere's DiseaseVest. Neuritis
Vertigo (duration)Secs-MinsMins-HrsDays
Hearing LossNoYes (fluctuating SNHL)No
TinnitusNoYes (roaring)No
TriggersHead movementsSpontaneous/SaltPost-viral
NystagmusPositionalSpontaneous (horiz)Spontaneous (horiz)
*   Prognosis: Excellent with CRPs. Recurrence **15-20%**/year.
*   Complications: Falls, anxiety, residual dizziness.

⭐ BPPV typically does not cause hearing loss or tinnitus, unlike Meniere's disease or vestibular neuritis.

High-Yield Points - ⚡ Biggest Takeaways

  • BPPV: Most common cause of recurrent vertigo.
  • Pathophysiology: Canalithiasis (free-floating otoconia) in semicircular canals, predominantly posterior canal (PSC).
  • Clinical: Sudden, brief episodes of vertigo (seconds to < 1 minute), provoked by changes in head position.
  • Diagnosis: Dix-Hallpike maneuver elicits characteristic torsional/rotatory nystagmus (latency, fatigable, transient).
  • Treatment: Canalith Repositioning Procedures (CRP), e.g., Epley maneuver for PSC BPPV.
  • Key differentiator: No associated hearing loss or tinnitus (distinguishes from Meniere's disease).

Practice Questions: Benign Paroxysmal Positional Vertigo

Test your understanding with these related questions

A 60-year-old man presents to his primary care physician complaining that he often feels as if the room is spinning when he gets up from a recumbent position or turns his head. He has not lost consciousness and has had no chest pain. He has no cardiac history, and a recent treadmill test showed no abnormalities. On examination, the sensation can be produced by rapidly turning the head. It can be reproduced many times, but it eventually ceases. Nystagmus is elicited. Hearing is normal. Which of the following is the MOST likely mechanism for this patient's symptoms?

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Flashcards: Benign Paroxysmal Positional Vertigo

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Menieres disease, also called _____, occurs due either due to excessive production or faulty absorption of endolymph.

TAP TO REVEAL ANSWER

Menieres disease, also called _____, occurs due either due to excessive production or faulty absorption of endolymph.

endolymphatic hydrops

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