Functional brain mapping in patients with chronic back pain shows age-related differences

Area of Science:

• Neuroscience
• Gerontology
• Pain Research

Background:

• Low back pain (LBP) is a leading cause of disability in older adults, who often experience greater disability and undertreatment.
• The underlying reasons for the increased prevalence and severity of chronic low back pain (CLBP) in older populations remain unclear.
• Brain limbic and sensory circuits are implicated in the development and experience of CLBP.

Purpose of the Study:

• To investigate age-related differences in brain activity patterns associated with CLBP.
• To identify neural signatures of CLBP that distinguish between younger and older adult patient groups.

Main Methods:

• Utilized a data-driven multivariate searchlight analysis on resting-state brain activity (amplitude of low-frequency fluctuations).
• Classified patients with CLBP with over 70% accuracy using identified brain activity patterns.
• Compared brain activity patterns predictive of CLBP in younger versus older adult cohorts.

Main Results:

• A specific brain activity pattern (paracingulate gyrus, insula/secondary somatosensory area, inferior frontal, temporal, fusiform gyrus) predicted CLBP.
• Older patients with CLBP exhibited predictive patterns involving extensive limbic areas (ventromedial prefrontal cortex, nucleus accumbens, hippocampus).
• Younger patients with CLBP showed predictive patterns primarily in the anterior insula, paracingulate, and fusiform gyrus.

Conclusions:

• Aging significantly alters the neural signature of CLBP.
• Limbic brain areas play a more prominent role in the neural basis of CLBP in older adults compared to younger individuals.
• Findings provide novel insights into the neurobiology of CLBP across the lifespan.