Combined transcranial direct current stimulation and pain neuroscience education for chronic low back pain: a randomized controlled trial.

OBJECTIVE

Priming the neural circuity likely targeted by pain neuroscience education (PNE), using transcranial direct current stimulation (tDCS) may enhance the efficacy of PNE. The aim of this study was to compare the effects of active tDCS + PNE to sham tDCS + PNE on measures of pain, pain behaviors, and cognitive function in participants with chronic low back pain (CLBP) and high pain catastrophizing.

METHODS

20 participants were recruited and randomly allocated into the active tDCS + PNE (n = 10) or sham tDCS + PNE (n = 10) groups. All participants received five sessions of their assigned interventions over a 2-week period. The active tDCS + PNE group received 20 min of 2 mA, anodal current applied to the left dorsolateral prefrontal cortex.

RESULTS

Within groups, both interventions demonstrated significant improvement in NPRS, PCS, and TSK. The active tDCS + PNE group also demonstrated significant improvement in the SCWT, CTMT2-Inhibitory, and CTMT2-Set Shifting. Between groups, the active tDCS + PNE group showed significantly greater improvement on the PCS, SCWT, and CTMT2-Inhibitory.

CONCLUSIONS

The results of this pilot study suggest that active tDCS + PNE appeared to provide greater improvement than sham tDCS + PNE on levels of pain catastrophizing and attentional interference in participants with CLBP and high pain catastrophizing, consistent with both interventions targeting brain regions involved in those processes. Considering the differences between groups, tDCS appears to provide a priming effect on PNE.

PERSPECTIVE

This article presents evidence of a priming effect of transcranial direct current stimulation on pain neuroscience education in participants with chronic low back pain and high pain catastrophizing. The findings support that the combination of interventions improves pain behavior and cognitive function greater than pain neuroscience education alone.

CLINICAL TRIAL REGISTRY

NCT05571215, The Effect of Combining Pain Neuroscience Education and Transcranial Direct Current Stimulation on Pain Catastrophizing, Kinesiophobia, and Pain in Patients With Chronic Low Back Pain, https://classic.clinicaltrials.gov/ct2/show/NCT05571215.