Temporal Summation but Not Expectations of Pain Relief Predict Response to Acupuncture Treatment in Fibromyalgia.

Researchers at a single medical center studied whether they could predict which fibromyalgia patients would benefit most from acupuncture treatment. The study involved 76 people with fibromyalgia who were randomly assigned to receive either electroacupuncture (acupuncture with electrical stimulation) or a placebo treatment using mock laser acupuncture. Before treatment began, researchers measured each participant's temporal summation—a test that shows how the nervous system responds to repeated painful stimuli—and asked about their expectations for pain relief. Both groups experienced significant improvements in their pain levels and fibromyalgia symptoms after treatment. The key discovery was that patients with lower temporal summation scores at the start of the study had better pain relief outcomes after real electroacupuncture treatment. Surprisingly, what patients expected about their treatment results did not predict how well they actually responded to acupuncture. This finding is important because temporal summation is an objective measurement that healthcare providers can perform before treatment. It suggests that a simple sensory test could help identify which fibromyalgia patients are most likely to benefit from acupuncture, potentially saving time and resources by targeting treatment to those who will respond best. For fibromyalgia patients considering acupuncture, this research indicates that the state of your nervous system's pain processing—not your mindset about treatment—may be the better indicator of success. If you're interested in acupuncture for fibromyalgia, seek a licensed acupuncturist with experience treating chronic pain conditions.

This single-center, single-blind RCT enrolled 76 fibromyalgia patients randomized to electroacupuncture (EA) or mock laser (ML) acupuncture. Primary outcomes included Brief Pain Inventory (BPI), Fibromyalgia Survey Questionnaire, and pressure pain tolerance (PPtol). Both groups demonstrated significant reductions in BPI (EA: P<.001, ML: P=.018) and FSQ scores (EA: P=.032, ML: P=.002), with no significant PPtol changes. Critically, lower baseline temporal summation correlated with greater BPI improvement in the EA group (rho=.389, P=.025) but not ML (rho=-.272, P=.109). Similarly, lower baseline temporal summation predicted greater PPtol decreases after EA (rho=.400, P=.040), while the inverse occurred with ML (rho=-.562, P=.001). Treatment expectancy showed no correlation with outcomes in either group. Clinical implications suggest quantitative sensory testing for temporal summation may serve as a valuable predictor for acupuncture treatment response in fibromyalgia, independent of placebo effects driven by patient expectations.