- Clinical science
Benign paroxysmal positional vertigo (BPPV) is a disease of the inner ear caused by small particles (otoliths) dislodging and migrating within the endolymph fluid into one of the semicircular canals. When provoked by certain head movements, these particles change position and stimulate the vestibular system, which leads to episodes of vertigo generally lasting less than a minute. Patients are typically aware of what movements trigger symptoms (e.g., quickly lying down or reclining the head). Diagnostic maneuvers that provoke vertigo attacks are used to identify BPPV. Treatment involves carrying out repositioning maneuvers to remove the particles from the semicircular canals.
- Often idiopathic
- In rare cases, traumatic
BPPV is caused by semicircular canal dysfunction.
- Dislodged particles ( → stimulation of the ) disrupt the endolymphhair cells on cupulas → signal sent to the brain through the vestibulocochlear nerve that is disproportional to current positioning and movement → severe vertigo attacks lasting several seconds
- Sudden (“paroxysmal”) and recurrent
- Triggered by certain head movements (“positional”)
- Lasts several seconds (generally ≤ 1 minute)
- A propensity to fall towards the healthy side
- Typically associated with nystagmus (towards the affected side)
- Sometimes nausea or even vomiting
- Not associated with hearing or neurological symptoms
- Common triggers
Suspected cases are confirmed with provocative diagnostic testing.
Positive Dix-Hallpike test
- The patient sits with their legs extended.
- The head is rotated by about 45° (affected side facing downwards).
- The head is then quickly reclined.
- If right-sided BPPV: rotational nystagmus with a counterclockwise rapid phase occurs after a few seconds. In contrast, left-sided BPPV presents with a clockwise rapid phase.
- Rotational nystagmus to the opposite side is common when returning to a sitting position.
Consider other diagnoses if attacks last longer than one minute, or if hearing or neurological symptoms (e.g., gait disturbances) are present (see )
The differential diagnoses listed here are not exhaustive.
In resistant cases: surgical obliteration of the affected canal