Understanding Benign Paroxysmal Positional Vertigo (BPPV)
A common inner ear disorder causing brief but intense dizziness is often misunderstood but treatable.
Benign paroxysmal positional vertigo (BPPV) is a common vestibular disorder affecting the inner ear that can cause sensations of spinning or whirling, even when the body is still. While the term 'benign' is part of its name, the experience can be severe, leading to significant dizziness, unsteadiness, sweating, and nausea. Individual episodes are typically short, lasting between 15 and 60 seconds, but they can reoccur with specific head movements, interfering with daily activities and increasing the risk of falls.
Despite the alarming symptoms, BPPV is not a stroke, according to Dr. Nedim Durakovic, an associate professor at the Washington University School of Medicine in St. Louis. "The term 'benign' is the first part of the phrase—it does not feel benign when you experience it," he noted.
What Causes BPPV? BPPV occurs when tiny calcium carbonate crystals, known as otoconia, become dislodged from their normal position on hair cells in the inner ear. These crystals then migrate into one of the three semicircular canals. A change in head position, such as rolling over in bed or tilting the head back, often triggers the dizzy spells. These crystals are a natural part of the ear's balance system, but when they are in the wrong place, they can cause vertigo.
BPPV affects women more than men, and it is most common in individuals between the ages of 40 and 70. While it can occur at any time, head trauma and dental procedures involving drilling are identified as common triggers. Individuals with certain health conditions, including Menière's disease, diabetes, hypertension, high cholesterol, hypothyroidism, migraine, anemia, osteoporosis, or peripheral neuropathy, are considered more susceptible. Research also suggests that low vitamin D levels may be a risk factor.
Diagnosis of BPPV Diagnosing BPPV can sometimes be challenging, with patients undergoing extensive and expensive tests like MRIs or CT scans when a simpler diagnostic method is available. Dr. Durakovic pointed out that a key diagnostic tool involves observing the patient's eyes. Using the Dix-Hallpike maneuver, a healthcare provider moves a patient from a seated to a supine position and adjusts their head's position to observe eye movements. Rapid, repetitive, involuntary up-and-down or twisting eye movements, known as nystagmus, are a hallmark sign of BPPV when they accompany vertigo. If nystagmus is observed during this maneuver, the diagnosis is typically clear. Other diagnostic techniques may be employed if nystagmus is not present.
Treatment for BPPV The primary treatment for BPPV is the Epley maneuver, a series of specific head and body movements designed to relocate the dislodged crystals out of the semicircular canal and alleviate vertigo. This maneuver is effective in over 80% of cases, though it may require repetition. The choice of repositioning maneuver can depend on which semicircular canal is affected. These maneuvers guide the crystals back to their normal location within the inner ear. If relief is not immediate, patients may be advised to perform the maneuvers themselves one to two times daily while symptomatic.
In cases where repositioning maneuvers are not fully effective, BPPV may resolve on its own over time. Other treatment options include vestibular rehabilitation therapy, which focuses on improving dizziness and balance, or surgery to block the affected part of the inner ear. While some physicians may prescribe vestibular suppressant medications like benzodiazepines or antihistamines, experts caution against their use as they only mask symptoms without addressing the underlying cause and can increase the risk of falls.
Recurrence and Prevention Approximately 20% of individuals who have experienced BPPV will have recurrences. Staying hydrated, engaging in regular aerobic exercise, and maintaining adequate vitamin D levels can help reduce the likelihood of recurrence. If unexplained vertigo persists despite these measures, consulting a neurotologist, otolaryngologist, or vestibular therapist is recommended to ensure an accurate diagnosis and appropriate management.