Approach to bilateral benign paroxysmal positioning vertigo

Area of Science:

• Neurology
• Otolaryngology
• Vestibular Disorders

Background:

• Bilateral benign paroxysmal positioning vertigo (bBPPV) is a rare condition, comprising up to 10% of BPPV cases.
• Incorrect head positioning during testing for unilateral BPPV can mimic bBPPV by causing inhibitory nystagmus.

Purpose of the Study:

• To analyze clinical data of patients with bilaterally positive Dix-Hallpike maneuver.
• To compare characteristics of patients with bBPPV and unilateral BPPV.
• To propose a treatment approach for patients with bilaterally positive Dix-Hallpike maneuver.

Main Methods:

• Review of medical records of 232 patients treated for BPPV between 1999 and 2003.
• Analysis of patients with bilaterally positive Dix-Hallpike test (n=28) and comparison with unilateral posterior canal BPPV controls (n=30).
• Discussion of a treatment algorithm for bilaterally positive BPPV.

Main Results:

• Sixteen patients were diagnosed with bBPPV, and 12 with unilateral BPPV mimicking bBPPV.
• No significant differences in age, sex, symptom duration, treatment frequency, or recurrence rates were observed between bBPPV and unilateral BPPV.
• Female patients required more treatments; longer symptom duration correlated with more recurrences.

Conclusions:

• bBPPV is clinically distinguishable from unilateral BPPV with similar characteristics.
• Otolith debris dislodgment is the primary cause of bilaterality, with trauma being a frequent trigger.
• bBPPV and unilateral BPPV share similar clinical features, suggesting common underlying mechanisms.