Diagnostic Approach to Dizziness in Adolescents

History and Physical Examination

The initial workup should focus on categorizing dizziness by timing and triggers through targeted history and physical examination, with imaging reserved only for red flag features suggesting central pathology 1, 2
Brief episodic dizziness (seconds to <1 minute) triggered by head position changes suggests benign paroxysmal positional vertigo (BPPV) 1, 2
Acute persistent dizziness (days to weeks) with constant symptoms suggests acute vestibular syndrome, requiring differentiation between peripheral versus central causes 1, 3
Recurrent episodic dizziness (minutes to hours) associated with headache, photophobia, or phonophobia suggests vestibular migraine 1
Chronic dizziness (weeks to months) may be due to medication effects, psychiatric causes, or posttraumatic vertigo 1
Key associated symptoms to elicit include hearing loss, tinnitus, or aural fullness, which suggest Ménière disease 1, and headache, diplopia, dysarthria, numbness, or weakness, which suggest central pathology 2
The Dix-Hallpike maneuver is used to diagnose BPPV, with a latency period of 5-20 seconds, torsional upbeating nystagmus toward the affected ear, and symptoms that resolve within 60 seconds 4, 1, 2
A complete neurologic examination, including cranial nerves, cerebellar testing, and gait assessment, is essential in evaluating dizziness 3, 2
Observing for spontaneous nystagmus, particularly central patterns, is crucial in identifying potential central causes 1, 2

Routine laboratory testing has extremely low yield in adolescents with isolated dizziness and normal examination 5
Bedside glucose testing and pregnancy testing may be necessary in specific situations 5
Imaging, such as MRI brain, is only indicated in the presence of red flags, including focal neurological deficits, sudden unilateral hearing loss, inability to stand or walk, downbeating or other central nystagmus patterns, new severe headache, or progressive neurologic symptoms 1, 3, 2
CT head has limited sensitivity for posterior circulation stroke and should not be used instead of MRI when central pathology is suspected 1, 2

For BPPV, the canalith repositioning procedure (Epley maneuver) has a success rate of 90-98%, with no medications needed, and patients should be counseled about the 10-18% recurrence rate at 1 year 1, 3
For vestibular migraine, migraine prophylaxis and lifestyle modifications are recommended 1, 3

Assuming a normal neurologic exam excludes stroke, as 75-80% of posterior circulation strokes have no focal deficits 1, 3
Ordering imaging for straightforward BPPV without concerning features, which delays treatment unnecessarily 1, 2
Skipping the Dix-Hallpike maneuver, which is the gold standard diagnostic test for BPPV 4, 1
Relying on symptom quality alone, as timing and triggers are more diagnostically valuable 1, 3, 2