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Pain relief through expectation supersedes descending inhibitory deficits in fibromyalgia patients
Pain, 06/16/09

Goffaux P et al. - Here, the authors show that expectations of analgesia radically change the subjective experience of pain, but do not eliminate evidence of spinal hyperexcitability in FM patients. The authors found that expectations of analgesia reduce subjective pain ratings and decrease SEP amplitudes, confirming that expectations influence thalamocortical processes. However, even when analgesia was experienced, the spinal activity of FM patients was abnormal, showing heightened reflex responses. This demonstrates that, unlike healthy subjects, the modulation of pain by expectations in FM fails to influence spinal activity. These results indicate that FMs are capable of expectancy-induced analgesia but that, for them, this form of analgesia does not depend on the recruitment of descending inhibitory projections.

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