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Benign Paroxysmal Positional Vertigo (Benign Positional Vertigo)
Benign paroxysmal positional vertigo, or BPPV, is a common disorder causing short episodes of vertigo (a false sensation of moving or spinning) in response to changes in head position that stimulate the posterior semicircular canal of the inner ear.
People briefly feel as if they or their surroundings are moving or spinning when they move their head.
People may also feel nauseated and vomit, and their eyes may move abnormally.
Doctors base the diagnosis on symptoms and the situations in which they occur and a physical examination.
The Epley maneuver, done once or twice, cures the disorder in most people.
People with vertigo (see page Dizziness and Vertigo) have a false sensation that they, their surroundings, or both are moving or spinning.
A change in head position—typically turning the head over on the pillow on first awakening in the morning, or tipping the head backward to reach a high shelf—triggers most episodes of this disorder. BPPV usually develops when calcium particles (otoconia) that are normally embedded in one part of the inner ear (the utricle and saccule) are displaced and move into another part of the inner ear (most commonly the posterior semicircular canal). The inner ear contains three semicircular canals, which help with balance (see page A Look Inside the Ear). The posterior canal, unlike the anterior and horizontal canals, is in the best position to receive most of the loose particles through gravity during the night. As they collect, they form a chalky sludge and may further form into a mass that exaggerates the movement of fluid in the canal when the head changes position. The result is overstimulation of nerve receptors (hair cells) inside the posterior canal, making the brain feel as if the head were moving much faster or differently than it is.
Particles may be displaced from the utricle and saccule as people age. Or, displacement may be caused by ear infections, injury, prolonged bed rest, ear surgery, head injury, or blockage of an artery to the inner ear.
This type of vertigo can be frightening but it is usually harmless and disappears by itself. Vertigo is triggered when the person’s head moves (such as when rolling over in bed or bending over to pick up something). Each episode of vertigo lasts only a few seconds to minutes. People may have many episodes over the course of a few days to weeks after which episodes subside on their own. Vertigo may be accompanied by nausea, vomiting, and a specific type of nystagmus (the rapid jerking movement of the eyes in one direction alternating with a slower drift back to the original position). No hearing loss or noise in the ears (tinnitus) occurs.
Diagnosis is based on a description of the symptoms and the circumstances in which they occur.
Usually, the test used is the Dix-Hallpike maneuver, which stimulates the posterior semicircular canal and triggers vertigo and nystagmus in people with BPPV or other types of vertigo. The person sits on the examining table with the head turned 45 degrees to the right. Then the person lies down backwards so that the head remains turned at 45 degrees and hangs over the examining table by about 20 degrees. In BPPV, there is a delay of about 5 to 10 seconds before vertigo and nystagmus occur, but the delay may be as long as 30 seconds. Symptoms last 10 to 30 seconds. Maintaining the gaze on a single location (visual fixation) can shorten or even abolish nystagmus, so the maneuver is ideally done with the person wearing Frenzel lenses (which make it impossible to visually fixate on anything). If the maneuver is repeated several times, the intensity of the vertigo and nystagmus decreases (called habituation) in people who have BPPV. However, in people who have vertigo due to a brain disorder (such as stroke and multiple sclerosis), which is more serious, the Dix-Hallpike maneuver triggers symptoms immediately. The vertigo persists as long as the head is held in the same position, and habituation does not occur when the maneuver is repeated.
BPPV is easily treated. The particles simply need to be moved out of the posterior semicircular canal and into a part of the ear where they do not cause symptoms. Doing so requires a somersault-like maneuver of the head, called the canalith repositioning maneuver or Epley maneuver. This maneuver immediately cures vertigo in about 90% of people. Repeating the maneuver cures an additional 5%. In some people, the vertigo recurs. If it does, the maneuver is repeated. People can be taught how to do the maneuver at home in case vertigo recurs.
Very rarely, surgery is needed. Although the posterior semicircular canal is most commonly affected by BPPV, occasionally the horizontal canal is affected, and people can roll themselves like a log to relieve the symptoms.
The Epley Maneuver: A Simple Cure for a Common Cause of Vertigo
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