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Eye-Tracking Tool Might Quickly Spot Stroke
Date:3/6/2013

By Amanda Gardner
HealthDay Reporter

TUESDAY, March 5 (HealthDay News) -- The key to correctly diagnosing when a case of dizziness is just vertigo or a life-threatening stroke may be surprisingly simple: a pair of goggles that measures eye movement at the bedside in as little as one minute, a new study contends.

"This is the first study demonstrating that we can accurately discriminate strokes and non-strokes using this device," said Dr. David Newman-Toker, lead author of a paper on the technique that is published in the April issue of the journal Stroke.

Some 100,000 strokes are misdiagnosed as something else each year in the United States, resulting in 20,000 to 30,000 deaths or severe physical and speech impairments, the researchers said.

As with heart attacks, the key to treating stroke and potentially saving a person's life is speed. Magnetic resonance imaging (MRI), the current gold standard for assessing stroke, can take up to six hours to complete and costs $1,200, said Newman-Toker, who is an associate professor of neurology and otolaryngology at Johns Hopkins Hospital in Baltimore.

Sometimes people don't even get as far as an MRI, and may be sent home with a first "mini stroke" that is followed by a devastating second stroke, he added.

The new study findings come with some significant caveats, however.

For one thing, the study was a small one, involving only 12 patients.

"It is impossible for a small study to prove 100 percent accuracy," said Dr. Daniel Labovitz, director of the Stern Stroke Center at Montefiore Medical Center in New York City, who was not involved with the study. About 4 percent of dizziness cases in the emergency room are caused by stroke.

The other caveat is that the device is not yet approved in the United States for diagnosing stroke. The U.S. Food and Drug Administration only recently gave it approval for use in assessing balance. It has be
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