Benign Paroxysmal Positional Vertigo
Brief, intense spells of spinning dizziness triggered by looking up, rolling over in bed, or sudden head movements.
Emergency Management: Intractable vomiting leading to severe dehydration may require IV fluids (Normal Saline) and IV antiemetics (Ondansetron 4 mg IV or Promethazine 25 mg IM) in the emergency department.
Benign Paroxysmal Positional Vertigo (BPPV) is a biomechanical disorder of the inner ear characterized by brief episodes of mild to intense vertigo triggered by specific changes in the position of the head.
Detailed Overview
BPPV is the most common cause of peripheral vertigo. It occurs when calcium carbonate crystals (otoconia) normally embedded in the utricle dislodge and migrate into the semicircular canals, most commonly the posterior canal. When the head moves, these crystals shift, creating abnormal endolymph fluid flow that falsely signals head rotation to the brain.
Epidemiology & Demographics
The lifetime prevalence is 2.4%. It becomes more common with advancing age, peaking in the sixth decade. Women are affected twice as often as men.
Etiological Mechanism
Idiopathic in over 50% of cases. Secondary causes include head trauma, viral vestibular neuritis, Meniere disease, or prolonged bed rest.
Primary Causes
Dislodgment of otoconia from the macula of the utricle into the semicircular canals (canalithiasis) or adherence to the cupula (cupulolithiasis).
In canalithiasis (most common), loose otoconia float freely in the endolymph of a semicircular canal (usually posterior). Head movement in the plane of the affected canal causes gravity to pull the otoconia downward, generating endolymphatic flow. This deflects the cupula, triggering a sudden, strong, but brief (usually <60 seconds) burst of action potentials to the vestibular nerve, interpreted as intense spinning.
Diagnostic Criteria & Guidelines
Clinical diagnosis based on a history of characteristic positional vertigo and the reproduction of vertigo with concomitant upbeating, torsional nystagmus during the Dix-Hallpike maneuver (for posterior canal BPPV) or the Supine Roll test (for horizontal canal BPPV).
Canalith Repositioning Procedures (CRP). For posterior canal BPPV, the Epley maneuver or Semont maneuver is performed to mechanically guide the otoconia back into the utricle. Often curative in 1-2 sessions.
Second-Line & Adjunctive Therapy
If maneuvers fail or cannot be performed, vestibular suppressant medications (e.g., Meclizine 25 mg PO Q6-8H) can be used briefly for symptom control, though they do not fix the underlying mechanical issue. Brandt-Daroff habituation exercises for home use.
Surgical & Procedural Management
Surgical occlusion (plugging) of the posterior semicircular canal or single singular neurectomy is reserved for severe, intractable cases failing all conservative maneuvers for >1 year (extremely rare).
Patient Counseling & Advice
Reassure the patient that while terrifying, the condition is benign and highly treatable. Warn them that BPPV has a recurrence rate of up to 50% within 5 years.
Follow-Up & Monitoring Schedule
Follow up in 1-2 weeks. If symptoms and positive Dix-Hallpike persist, repeat the repositioning maneuver. If refractory after multiple attempts, refer for vestibular testing or neuroimaging.
Preventive Strategies
No proven prevention. Vitamin D supplementation (e.g., 400-1000 IU/day) in deficient patients has been shown to reduce BPPV recurrence rates in some studies.
Excellent. The Epley maneuver is successful in ~80-90% of cases on the first attempt. Some patients have spontaneous resolution without treatment over weeks to months.