Distinct Functional Connectivity Patterns for Intermittent Vs Constant Neuropathic Pain Phenotypes in Persistent...

Area of Science:

• Neuroscience
• Medical Imaging
• Pain Research

Background:

• Chronic low back pain (cLBP) is linked to brain functional connectivity (FC) alterations.
• Previous studies used heterogeneous populations and single network analyses.
• This study investigates a homogeneous cLBP group using cross-network (CN) connectivity.

Purpose of the Study:

• To analyze CN connectivity in a homogeneous cLBP population.
• To investigate the relationship between CN FC, pain levels, and pain phenotype (constant vs. intermittent).
• To explore fcMRI as an objective tool for assessing cLBP.

Main Methods:

• Resting-state functional MRI (fcMRI) scans from 23 Persistent Spinal Pain Syndrome Type 2 patients.
• Cross-network (CN) analysis of 7 brain networks compared to age-matched controls.
• Linear regression to correlate CN connectivity with pain scores.

Main Results:

• CN FC in emotion networks (striatum network index) was significantly lower in cLBP patients than controls.
• Pain levels correlated positively with emotional FC in intermittent pain and negatively in constant pain.
• Altered FC patterns were specific to each pain phenotype.

Conclusions:

• First report of altered CN FC in emotion/reward circuitry in a homogeneous cLBP population with distinct pain phenotypes.
• FC patterns differed between constant and intermittent pain phenotypes.
• fcMRI shows potential as an objective tool for assessing pain in cLBP patients.