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Link Between Insulin Resistance and Fibromyalgia Identified

by Colleen Fleiss on May 9, 2019 at 7:04 AM
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Link Between Insulin Resistance and Fibromyalgia Identified

Insulin resistance may change the way fibromyalgia and related forms of chronic pain are identified and managed, said The University of Texas Medical Branch researchers at Galveston.

This discovery could dramatically alter the way that chronic pain can be identified and managed. Dr. Miguel Pappolla, UTMB professor of neurology, said that although the discovery is very preliminary, it may lead to a revolutionary shift on how fibromyalgia and related forms of chronic pain are treated. The new approach has the potential to save billions of dollars to the health care system and decrease many peoples' dependence on opiates for pain management.

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The UTMB team of researchers, along with collaborators from across the U.S., including the National Institutes of Health, were able for the first time, to separate patients with fibromyalgia from normal individuals using a common blood test for insulin resistance, or pre-diabetes. They then treated the fibromyalgia patients with a medication targeting insulin resistance, which dramatically reduced their pain levels. The study was recently published in PlosOne.

Fibromyalgia is one of the most common conditions causing chronic pain and disability. The global economic impact of fibromyalgia is enormous - in the U.S. alone and related health care costs are about $100 billion each year. Despite extensive research the cause of fibromyalgia is unknown, so there's no specific diagnostics or therapies for this condition other than pain-reducing drugs.
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"Earlier studies discovered that insulin resistance causes dysfunction within the brain's small blood vessels. Since this issue is also present in fibromyalgia, we investigated whether insulin resistance is the missing link in this disorder," Pappolla said. "We showed that most - if not all - patients with fibromyalgia can be identified by their A1c levels, which reflects average blood sugar levels over the past two to three months."

Pre-diabetics with slightly elevated A1c values carry a higher risk of developing central (brain) pain, a hallmark of fibromyalgia and other chronic pain disorders."

The researchers identified patients who were referred to a subspecialty pain medicine clinic to be treated for widespread muscular/connective tissue pain. All patients who met the criteria for fibromyalgia were separated into smaller groups by age. When compared with age-matched controls, the A1c levels of the fibromyalgia patients were significantly higher.

"Considering the extensive research on fibromyalgia, we were puzzled that prior studies had overlooked this simple connection," said Pappolla. "The main reason for this oversight is that about half of fibromyalgia patients have A1c values currently considered within the normal range. However, this is the first study to analyze these levels normalized for the person's age, as optimal A1c levels do vary throughout life. Adjustment for the patients' age was critical in highlighting the differences between patients and control subjects."

For the fibromyalgia patients, metformin, a drug developed to combat insulin resistance was added to their current medications. They showed dramatic reductions in their pain levels.

Source: Eurekalert
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