To identify neurophysiological correlations related to the sensory and affective dimensions of chronic widespread pain (CWP) using resting-state EEG data.
Approach:
Participants: 20 CWP patients and 22 healthy controls were analyzed using current source density (CSD) and functional connectivity (FC) in key brain networks.
Data Analysis: EEG data were analyzed with exact low-resolution electromagnetic tomography (eLORETA) and correlated with pain scores from the numerical rating scale and short-form McGill Pain Questionnaire.
Key Findings:
No significant CSD or FC differences between CWP patients and healthy controls.
Current pain intensity in CWP patients was negatively correlated with CSD values in the γ bands of the precuneus/posterior cingulate cortex (r = −0.743).
The affective pain component was positively correlated with δ band FC between the anterior cingulate cortex and the right anterior insula (r = 0.647).
Interpretation:
Limitations:
The small sample size of 20 CWP patients and 22 healthy controls limits the robustness of the findings.
The exploratory nature of the study restricts the generalizability of the results.
Conclusion:
Future research with larger, homogeneous samples and longitudinal designs is needed to evaluate the potential clinical relevance of these electrophysiological correlations.
