What is the appropriate initial assessment and management for a 28-year-old woman presenting with acute dizziness?

Acute Dizziness in a 28-Year-Old Female

Begin with a focused history to classify the dizziness by timing and triggers, then perform the Dix-Hallpike maneuver if the history suggests triggered episodic vertigo, as benign paroxysmal positional vertigo (BPPV) is the most common cause of acute positional dizziness in young adults and can be diagnosed and treated at the bedside without imaging. 1

Initial Assessment: Classify by Timing and Triggers

The most critical step is determining whether the dizziness is:

• Triggered episodic (provoked by head position changes, lasting <1 minute) 1, 2
• Spontaneous episodic (unprovoked episodes lasting minutes to hours) 1
• Acute vestibular syndrome (continuous dizziness lasting days with nausea/vomiting) 1, 2
• Chronic (persistent symptoms for weeks to months) 1

Key History Elements to Elicit:

• Timing: Onset, duration of individual episodes, and overall symptom duration 1, 3
• Triggers: Specific head movements (rolling over in bed, looking up), spontaneous onset, or associated with standing 1, 2
• Associated symptoms: Hearing loss, tinnitus, aural fullness (suggests Ménière's disease), headache with photophobia/phonophobia (suggests vestibular migraine), or neurologic symptoms 1
• Vascular risk factors: Important for assessing stroke risk if central features present 2

Physical Examination Based on Classification

For Triggered Episodic Vertigo (Most Likely BPPV):

Perform the Dix-Hallpike maneuver bilaterally 1:

• Bring patient from upright to supine with head turned 45° to one side and neck extended 20° 1
• Positive test: Torsional upbeating nystagmus with 5-20 second latency, crescendo-decrescendo pattern, resolving within 60 seconds 1
• If negative on first side, repeat with opposite ear down 1
• If horizontal nystagmus or no nystagmus with compatible history, perform supine roll test for lateral canal BPPV 1

Do NOT obtain CT or MRI imaging if diagnostic criteria for BPPV are met without additional concerning features 1, 2

For Acute Vestibular Syndrome (Continuous Dizziness with Nystagmus):

Emergency clinicians should receive training in HINTS examination (Head Impulse, Nystagmus, Test of Skew), though as of 2023, HINTS testing by untrained emergency clinicians is inaccurate 2. If trained:

• Use HINTS examination to differentiate stroke from vestibular neuritis in patients with nystagmus 2
• Add finger rub test to further exclude stroke 2
• Assess gait severity in patients without nystagmus 2

Do NOT use CT scan (sensitivity only 28.5% for central causes) 2, 4 MRI has 79.8% sensitivity but will miss approximately one in five strokes if obtained early 4

Red Flags Requiring Neuroimaging:

• Downbeating nystagmus on Dix-Hallpike (suggests central pathology) 1
• Direction-changing nystagmus without head position changes 1
• Gaze-evoked nystagmus 1
• New neurologic deficits: Dysarthria, dysmetria, dysphagia, sensory/motor loss, Horner's syndrome 1
• Severe gait instability out of proportion to vertigo 1, 2
• Sudden onset with vascular risk factors 1

Management

For Confirmed Posterior Canal BPPV:

Treat immediately with canalith repositioning procedure (Epley maneuver) 1, 2:

1. Head turned 45° toward affected ear in upright position
2. Rapidly lay back to supine head-hanging 20° for 20-30 seconds
3. Turn head 90° toward unaffected side for 20 seconds
4. Turn head further 90° (nearly facedown) for 20-30 seconds
5. Return to upright sitting position 1

Do NOT prescribe postprocedural postural restrictions 1

Do NOT routinely prescribe vestibular suppressants (antihistamines, benzodiazepines) as they are ineffective for BPPV and delay central compensation 1

For Vestibular Neuritis:

Consider short-term corticosteroids 2 Vestibular rehabilitation may be offered 1

For Vestibular Migraine:

Characterized by episodes lasting 5 minutes to 72 hours with migraine features (headache, photophobia, phonophobia, aura) in ≥50% of episodes 1

Follow-Up

Reassess within 1 month to document resolution or persistence 1

If symptoms persist, evaluate for:

• Unresolved BPPV requiring repeat maneuvers 1
• Additional vestibular pathology (25-50% of recurrent BPPV cases) 1
• Need for vestibular rehabilitation if balance issues persist despite successful repositioning 1

Common Pitfalls

• Repeating Dix-Hallpike to demonstrate fatigability: Unnecessary and causes patient discomfort; may interfere with immediate treatment 1
• Obtaining imaging for isolated positional vertigo: CT positivity rate is only 2% in all ED dizziness patients; imaging not indicated if BPPV criteria met 1
• Using vestibular suppressants: No evidence of efficacy for BPPV; prevents accurate diagnosis and delays compensation 1
• Assuming negative Dix-Hallpike rules out BPPV: Negative predictive value only 52% in primary care; may need repeat testing at separate visit 1