Which diagnostic maneuver is used to diagnose benign paroxysmal positional vertigo?

Which diagnostic maneuver is used to diagnose benign paroxysmal positional vertigo?

• A. Dix-Hallpike maneuver
• B. Romberg test
• C. Head impulse test
• D. Weber test

Answer: (A)

The important idea here is that diagnosing BPPV relies on a test that actively provokes the specific vertigo and eye movements caused by displaced crystals in the inner ear. In BPPV, tiny otoliths drift into a semicircular canal (most often the posterior canal). When a person changes head position relative to gravity, these crystals shift the endolymph and distort transmission in the canal, producing brief vertigo and a distinct nystagmus. The Dix-Hallpike maneuver is designed for this. From a seated position, the head is turned about 45 degrees to one side, then the person is rapidly laid back with the head hanging slightly below the edge of the exam table, about 20–30 degrees of neck extension. If BPPV is present, the patient experiences a very brief spinning sensation and a characteristic nystagmus—typically torsional with a horizontal component—lasting seconds. The test is considered positive when vertigo and the specific eye movements occur in this position, helping to identify both the canal involved and the affected side. Other common balance or hearing tests don’t confirm BPPV because they don’t reproduce the positional vertigo or the specific nystagmus elicited by canalithiasis. The Romberg test assesses overall balance with sensory inputs removed (not specific to BPPV), the head impulse test evaluates the vestibulo-ocular reflex during rapid head turns (useful for general vestibular loss, not positional vertigo), and the Weber test screens for conductive versus sensorineural hearing loss (not related to vertigo provoked by head position).

The important idea here is that diagnosing BPPV relies on a test that actively provokes the specific vertigo and eye movements caused by displaced crystals in the inner ear. In BPPV, tiny otoliths drift into a semicircular canal (most often the posterior canal). When a person changes head position relative to gravity, these crystals shift the endolymph and distort transmission in the canal, producing brief vertigo and a distinct nystagmus.

The Dix-Hallpike maneuver is designed for this. From a seated position, the head is turned about 45 degrees to one side, then the person is rapidly laid back with the head hanging slightly below the edge of the exam table, about 20–30 degrees of neck extension. If BPPV is present, the patient experiences a very brief spinning sensation and a characteristic nystagmus—typically torsional with a horizontal component—lasting seconds. The test is considered positive when vertigo and the specific eye movements occur in this position, helping to identify both the canal involved and the affected side.

Other common balance or hearing tests don’t confirm BPPV because they don’t reproduce the positional vertigo or the specific nystagmus elicited by canalithiasis. The Romberg test assesses overall balance with sensory inputs removed (not specific to BPPV), the head impulse test evaluates the vestibulo-ocular reflex during rapid head turns (useful for general vestibular loss, not positional vertigo), and the Weber test screens for conductive versus sensorineural hearing loss (not related to vertigo provoked by head position).