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For First Time, Pain 'Signature' Spotted on Brain MRIs
Date:4/10/2013

By Amy Norton
HealthDay Reporter

WEDNESDAY, April 10 (HealthDay News) -- For the first time, scientists say they've found evidence that physical pain may leave a distinct "signature" in the brain that can be picked up with specialized MRI scans.

The study looked only at short-term pain in healthy people, but researchers hope the findings will lead to better understanding of complex conditions such as chronic severe headaches or fibromyalgia.

When researchers exposed healthy volunteers to a painful dose of heat, it left a reliable pattern of brain activity that could be viewed on functional MRI (fMRI) -- a type of imaging that charts changes in blood flow through the brain.

That so-called "neurologic signature" was able to predict people's subjective pain ratings with more than 90 percent accuracy, and it distinguished heat-induced pain from other feelings -- like warmth, and even emotional pain.

Experts said the findings, reported in the April 11 New England Journal of Medicine, hint at a way to objectively measure people's pain. Right now, that's done subjectively -- often, by having patients rate their pain on a scale of 1 to 10.

But the point is not to catch patients in a lie, stressed lead researcher Tor Wager, an associate professor of psychology and neuroscience at the University of Colorado at Boulder.

"This is not a pain lie-detector test, and it should not be used that way," Wager said. "People in pain need to be believed."

A pain expert not involved in the study agreed, but said objective measures might be useful in getting more information. "There are times when a patient isn't able to communicate about pain effectively -- for example, after a stroke," said Dr. Jing Wang, an assistant professor of anesthesiology at NYU Langone Medical Center, in New York City.

In other cases, patients' descriptions of their pain might not be completely reliable, such as when they h
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