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More than two million people visit US emergency rooms each year with complaints of dizziness, most of which is caused by harmless inner-ear problems, but 4 percent signal a stroke or a transient ischemic attack (TIA).
Complicating accurate stroke diagnosis is the fact that more than half of patients with dizziness---who are actually having a stroke---have none of the classic stroke symptoms:
Consequently, ER physicians may misdiagnose nearly a third of strokes, losing valuable time for treatment.
Source: Johns Hopkins Medicine