ENT · Vestibular Disorders
The facts most likely to be tested
The pathophysiology of BPPV involves otoliths (calcium carbonate crystals) dislodging from the utricle and migrating into the posterior semicircular canal.
Patients present with brief, episodic vertigo lasting less than one minute that is strictly triggered by head position changes.
The Dix-Hallpike maneuver is the diagnostic gold standard, which elicits fatigable, geotropic nystagmus with a latency period.
The Epley maneuver is the first-line canalith repositioning procedure used to treat posterior canal BPPV.
BPPV is distinguished from Meniere disease and vestibular neuritis by the absence of hearing loss, tinnitus, or constant vertigo.
The nystagmus in BPPV is characteristically torsional and upbeat when the affected ear is positioned downward during the Dix-Hallpike maneuver.
Vestibular suppressants like meclizine are generally not indicated for BPPV as they do not address the mechanical cause and may delay vestibular compensation.
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A 62-year-old woman presents to the clinic complaining of recurrent episodes of spinning sensations. She reports that the symptoms occur when she rolls over in bed or tilts her head back to reach for items on a high shelf. Each episode lasts approximately 30 seconds and resolves spontaneously. She denies hearing loss, tinnitus, or ear fullness. On physical examination, the Dix-Hallpike maneuver performed on the right side reproduces the symptoms and reveals torsional, upbeat nystagmus with a brief latency.
What is the most appropriate initial management for this patient?
Epley maneuver
The patient's presentation of brief, position-dependent vertigo with characteristic nystagmus on the Dix-Hallpike maneuver is diagnostic of BPPV, which is treated with the Epley canalith repositioning maneuver.
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Etiology / Epidemiology
Most common cause of vertigo in elderly patients; caused by canalithiasis of the posterior semicircular canal.
Clinical Manifestations
Brief, episodic vertigo triggered by head movement with fatigable nystagmus.
Diagnosis
Dix-Hallpike maneuver is the gold standard; look for torsional, upbeat nystagmus.
Treatment
Epley maneuver is the first-line treatment; medications are generally ineffective.
Prognosis
High recurrence rate of ~30-50% within 5 years; symptoms are usually self-limiting.
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Epidemiology & Etiology
Incidence increases significantly with age, peaking in the 6th and 7th decades. Often idiopathic, but frequently follows head trauma or prolonged bed rest. It is the most common peripheral vestibular disorder.
Pertinent Anatomy
The inner ear contains the utricle and three semicircular canals. The posterior canal is the most commonly affected due to its dependent anatomical position.
Pathophysiology
Displaced otoconia (calcium carbonate crystals) migrate from the utricle into the semicircular canals. These particles create a fluid drag on the cupula during head movement. This results in a false sense of motion and characteristic nystagmus.
Clinical Manifestations
Patients report brief episodes of spinning lasting <60 seconds triggered by rolling over in bed or looking up. The Dix-Hallpike maneuver reveals torsional, upbeat nystagmus with a latency period. Red flags include focal neurologic deficits, hearing loss, or persistent vertigo, which suggest central pathology.
Diagnosis
The Dix-Hallpike maneuver is the diagnostic gold standard. A positive test shows a latency period of 5-10 seconds before the onset of nystagmus. The nystagmus is fatigable, meaning it decreases with repeated testing.
Treatment
The Epley maneuver (canalith repositioning) is the definitive first-line treatment. Avoid long-term use of vestibular suppressants like meclizine, as they prevent central compensation. If the Epley maneuver fails, consider the Semont or Brandt-Daroff exercises.
Prognosis
Most patients achieve resolution with 1-2 sessions of canalith repositioning. Recurrence is common, occurring in 30-50% of patients over 5 years. Patients should be educated on the high risk of falls during acute episodes.
Differential Diagnosis
Vestibular Neuritis: continuous vertigo lasting days, no hearing loss
Labyrinthitis: continuous vertigo with associated sensorineural hearing loss
Meniere Disease: episodic vertigo with fluctuating hearing loss and tinnitus
Vestibular Migraine: vertigo associated with photophobia or aura
Brainstem Stroke: vertical nystagmus that does not fatigue, neurologic deficits