In a 47‑year‑old healthy woman with recurrent vertigo for three months, unresponsive to meclizine and with a previously negative work‑up, what is the appropriate next diagnostic and therapeutic approach?

Perform the Dix-Hallpike test immediately and treat with canalith repositioning maneuvers if positive for BPPV

Stop meclizine—it is not recommended for BPPV treatment and provides no benefit for this condition 1, 2. The 2017 AAO-HNS guideline explicitly recommends against routinely treating BPPV with vestibular suppressant medications like meclizine 1. While meclizine is FDA-approved for vertigo associated with vestibular system diseases 2, it does not address the underlying mechanical problem in BPPV and may cause drowsiness and anticholinergic side effects 2.

Immediate Diagnostic Approach

The Dix-Hallpike test is your primary diagnostic tool 1. This bedside maneuver:

• Identifies posterior canal BPPV (85-95% of BPPV cases) 1
• Requires no imaging or laboratory testing 1, 3
• Can be performed in any clinical setting by trained clinicians 1

If the Dix-Hallpike is positive (reproduces vertigo with characteristic nystagmus), immediately perform the Epley maneuver (canalith repositioning procedure) 1. This is the definitive treatment with high cure rates 1, 4.

If Dix-Hallpike is Negative

Consider these alternatives in order:

1. Perform the supine roll test to evaluate for lateral (horizontal) canal BPPV (5-15% of cases) 1, 4

2. Reassess for vestibular migraine, which is a common cause of recurrent vertigo in women aged 30-50 years 5, 6. Key features include:

   • Vertigo episodes lasting minutes to hours
   • Associated migraine features (photophobia, phonophobia, visual aura)
   • Movement sensitivity between attacks
   • Premonitory symptoms or brain fog 6

3. Consider Ménière's disease if there is:

   • Unilateral hearing loss or tinnitus
   • Episodes lasting 20 minutes to several hours
   • Aural fullness 7, 8

When to Order Vestibular Function Testing

Do NOT routinely order vestibular testing for straightforward BPPV 1. However, testing is warranted when 1:

• Atypical nystagmus is present
• Failed or repeatedly failed response to canalith repositioning
• Frequent recurrences (25-50% of recurrent BPPV patients have additional vestibular pathology) 1
• Suspected additional vestibular disorders (Ménière's, vestibular neuritis) 1

When to Order Imaging

Imaging is NOT indicated for typical BPPV 1, 3. The ACR Appropriateness Criteria state that CT positivity in ED patients with dizziness is only 2% 3.

Order MRI brain with contrast if 3:

• Neurologic deficits are present
• Central vertigo is suspected (continuous nystagmus, direction-changing nystagmus, severe gait instability)
• HINTS examination suggests central pathology

Treatment Algorithm

For confirmed posterior canal BPPV:

1. Epley maneuver (Table 10 in guideline provides step-by-step sequence) 1
2. May repeat immediately if first attempt unsuccessful 4
3. Patient can perform self-treatment at home if symptoms recur 1

For vestibular migraine (if diagnosed):

• Acute: vestibular suppressants (short-term only) or triptans 5
• Preventive: beta-blockers, calcium channel blockers, or certain antidepressants 5, 6
• Vestibular rehabilitation 5

For Ménière's disease:

• Salt restriction and diuretics 7

Critical Pitfall to Avoid

The most common error in ED and primary care is prescribing meclizine and discharging without performing diagnostic maneuvers 4. This results in:

• Persistent symptoms
• Unnecessary imaging and specialist referrals
• Medication side effects without therapeutic benefit
• Prolonged disability 4

The entire diagnostic and therapeutic process (Dix-Hallpike + Epley) takes less than 10 minutes and provides immediate symptom relief in most BPPV cases 4.