Vertigo (medical)

Vertigo is a well-recognized medical condition that consists of the illusion of movement, usually of turning. Most often, patients with vertigo "see" the room and world spinning around them, but sometimes that hallucination of movement is centered on the body, instead, and the patient feels as if he or she is spinning within the room or other setting. In severe vertigo, there is often nausea and even vomiting.

Pathophysiology

Benign positional vertigo

The membranous labyrinth (lateral view of the right inner ear).
• The external semicircular canal is also called the horizontal or lateral canal.
• The superior semicircular canal is also called the anterior canal.

Most cases of benign positional vertigo are due to canaliths or otoliths (calcium carbonate crystals) in the posterior canal that stimulate the cupula. Disease of the horizontal canal accounts for 10-17% of cases.

Diagnosis

Skew deviation (vertical misalignment) suggests a central lesion.

The Dix–Hallpike maneuver can diagnose positional vertigo (BPPV):

• Posterior canal BPPV causes "upbeating and torsional nystagmus with the top pole of rotation beating toward the affected (downside) ear"
• Horizontal canal BPPV causes "horizontal geotropic (toward the ground) or apogeotropic (away from the ground) direction-changing paroxysmal positional nystagmus"
• Anterior canal BPPV

Treatment

Benign positional vertigo

Clinical practice guidelines by the American Academy of Neurology address the treatment of benign positional vertigo. The guidelines state:

• Canalith repositioning procedure may treat benign positional vertigo due to the posterior semicircular canal