Abstract
To investigate nerve excitability changes in patients with fibromyalgia and the correlation with clinical severity. We enrolled 20 subjects with fibromyalgia and 22 sex and age-matched healthy subjects to receive nerve excitability test and nerve conduction study to evaluate the peripheral axonal function. In the fibromyalgia cohort, the sensory axonal excitability test revealed increased superexcitability (%) (P=0.029) compared to healthy control. Correlational study showed a negative correlation between increased subexcitability (%) (r=-0.534, P=0.022) with fibromyalgia impact questionnaire (FIQ) score. Computer modeling confirmed that the sensory axon excitability pattern we observed in fibromyalgia cohort was best explained by increased Barrett-Barrett conductance, which was thought to be attributed to paranodal fast K+ channel dysfunction. The present study revealed that paranodal sensory K+ conductance was altered in patients with fibromyalgia. The altered conductance indicated dysfunction of paranodal fast K+ channels, which is known to be associated with the generation of pain.
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