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Last Updated: Mar 17, 2013 - 5:45:26 AM
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Nerve damage may underlie widespread, unexplained chronic pain in children

Mar 11, 2013 - 4:00:00 AM
Recommended diagnostic tests for SFPN include a type of skin biopsy that characterizes the number and condition of nerve fibers in the lower leg and autonomic function testing, including monitoring the heart rate and blood pressure when an individual breaths deeply, blows out when the airway is blocked or is placed on a tilt table. A control group of 38 age- and gender-matched volunteer children underwent the same autonomic function tests that the patients had received, and control values for neurodiagnostic skin biopsies were based on samples from healthy age- and gender-matched volunteers collected at MGH.

 
[RxPG] Massachusetts General Hospital (MGH) investigators have described what may be a newly identified disease that appears to explain some cases of widespread chronic pain and other symptoms in children and young adults. Their report that will appear in the April issue of the journal Pediatrics, and has received early online release, finds that most of a group of young patients seen at the MGH for chronic, unexplained pain had test results indicating small-fiber polyneuropathy, a condition not previously reported in children. The MGH investigators call this new syndrome juvenile-onset small-fiber polyneuropathy or JOSeFINE.

We've found the beginnings of a way to better evaluate young patients with otherwise unexplained widespread body pain, says Anne Louise Oaklander, MD, PhD, director of the Nerve Injury Unit in the MGH Department of Neurology and corresponding author of the Pediatrics paper. By identifying the tests that are useful for diagnosing this condition, we hope to reduce the use of unnecessary, expensive, sometimes painful and potentially harmful testing that many of these children have undergone.

Small-fiber polyneuropathy (SFPN) involves widespread damage to the type of nerve fibers that carry pain signals from the skin and also control autonomic functions such as heart rate, blood pressure and sweating. Most commonly associated with diabetes, SFPN can be caused by other disorders in older adults or by exposure to toxic substances. Typical symptoms include chronic pain in several parts of the body, often beginning in the feet or lower legs, along with symptoms of autonomic dysfunction such as gastrointestinal problems, dizziness or fainting when standing, rapid heart rate, and changes in the appearance of skin. Specific diagnostic criteria have been established for SFPN, and accurate diagnosis can guide appropriate treatment choice.

Although polyneuropathy has been considered rare in children, occasional cases have been described. To get a better sense of the possible contribution of SFPN to chronic pain in children, Oaklander and her co-author Max Klein, PhD, a research fellow in Neurology at MGH, reviewed the records of 41 patients treated by Oaklander between 2007 and 2011 for persistent widespread pain in several parts of the body that began before age 21. In a search for the cause of their symptoms, all of the patients had undergone a range of diagnostic tests at the MGH and other leading institutions.

Recommended diagnostic tests for SFPN include a type of skin biopsy that characterizes the number and condition of nerve fibers in the lower leg and autonomic function testing, including monitoring the heart rate and blood pressure when an individual breaths deeply, blows out when the airway is blocked or is placed on a tilt table. A control group of 38 age- and gender-matched volunteer children underwent the same autonomic function tests that the patients had received, and control values for neurodiagnostic skin biopsies were based on samples from healthy age- and gender-matched volunteers collected at MGH.





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