纤维肌痛综合征病因新发现

A new brain scan study concludes that fibromyalgia is related to abnormalities of blood flow in the brain.

Using single photon emission computed tomography (SPECT), researchers in France were able to detect functional abnormalities in certain regions in the brains of patients diagnosed with fibromyalgia, reinforcing the idea that symptoms of the disorder are related to a dysfunction in those parts of the brain where pain is processed.承德医学院附属医院骨科杜志峰

“Fibromyalgia is frequently considered an ‘invisible syndrome’ since musculoskeletal imaging is negative,” said Eric Guedj, M.D., and lead author of the study. “Past imaging studies of patients with the syndrome, however, have shown above-normal cerebral blood flow (brain perfusion) in some areas of the brain and below-normal in other areas. After performing whole-brain scans on the participants, we used a statistical analysis to study the relationship between functional activity in even the smallest area of the brain and various parameters related to pain, disability and anxiety/depression.”

In the study, which was reported in the November issue of The Journal of Nuclear Medicine, 20 women diagnosed with fibromyalgia and 10 healthy women as a control group responded to questionnaires to determine levels of pain, disability, anxiety and depression. SPECT was then performed, and positive and negative correlations were determined.
“Fibromyalgia may be related to a global dysfunction of cerebral pain-processing,” study author Eric Guedj, MD, of Centre Hospitalo-Universitaire de la Timone, in Marseille, France, says in a news release. “This study demonstrates that these patients exhibit modifications of brain perfusion not found in healthy subjects and reinforces the idea that fibromyalgia is a ‘real disease/disorder.’”

Fibromyalgia is a chronic disorder characterized by widespread muscle pain and fatigue. It affects 2%-4% of people, mostly women. It has been called the “invisible syndrome” because it can’t be diagnosed based on a lab test or X-ray.

Past imaging studies of patients with fibromyalgia had shown abnormalities in cerebral blood flow, also called brain perfusion. In some areas of the brain, blood flow was below normal, and in some areas, it was above normal. In this study, by using whole-brain scans on the participants, researchers were able to analyze how perfusion in each area of the brain related to measures of pain, disability, anxiety, and depression.

Researchers confirmed that patients with fibromyalgia exhibited brain perfusion abnormalities in comparison to the healthy participants. These abnormalities corresponded with the severity of the disease. An increase in blood flow was found in areas of the brain involved in sensing pain and a decrease was found within an area thought to be involved in emotional responses to pain.

There seemed to be no relationship between these abnormalities and presence of depression or anxiety. “We found that these functional abnormalities were independent of anxiety and depression status,” Guedj says in a news release.