Validating a Clinical Decision Support Tool for Stratifying Stroke Risk for Dizziness/Vertigo

Inclusion Criteria: * Presenting to the emergency department with dizziness or vertigo * Aged ≥ 20 * Dizziness or vertigo lasting for at least 1 hour and \< 7 days * Persistent dizziness or vertigo at the time of the examination at the emergency department Exclusion Criteria: * Having 5 or more prior episodes similar in quality, intensity, and duration to the current symptoms, with at least one episode more than a year prior and one within the past year * Having frank stroke-like symptoms or signs, such as hemiparesis, facial asymmetry, dysarthria, dysphasia, ataxia, gaze palsy * Consciousness disturbance, Glasgow coma scale \< 13 * Severe dementia * Recent stroke within 3 months * Dizziness or vertigo thought to be the result of head injury, hypotension, medication/drug intoxication, hypoglycemia, electrolyte imbalance, anemia, hepatic encephalopathy, hydrocephalus, etc * Concomitant head or neck trauma * Severe degenerative cervical spondylosis * Having contraindications to magnetic resonance imaging examination