Does cognitive functioning predict chronic pain? Results from a prospective surgical cohort.

Area of Science:

• Neuroscience
• Pain Research
• Cognitive Psychology

Background:

• Chronic pain is known to impair cognitive functions like memory and attention.
• Brain regions involved in pain modulation, such as the prefrontal cortex, also play a role in cognition.
• The predictive role of cognitive function on the development of chronic pain has not been previously investigated.

Purpose of the Study:

• To investigate whether pre-operative cognitive function predicts the development, severity, and neuropathic quality of chronic pain after surgery.
• To examine the relationship between executive function, visual memory, attention, and post-surgical pain outcomes.

Main Methods:

• A prospective longitudinal study involving 189 surgical patients (total knee arthroplasty or breast surgery).
• Pre-operative neuropsychological assessments included the Trail-Making Test A and B, and Rey-Osterrieth Complex Figure (copy and recall).
• Patients were evaluated for pain intensity, neuropathic symptoms (Douleur Neuropathique 4), anxiety, and depression at 6 and 12 months post-surgery.

Main Results:

• Poorer performance on the Trail Making Test B, Rey-Osterrieth Complex Figure copy, and recall predicted the presence of clinically meaningful pain at 6 and 12 months post-surgery.
• Impaired cognitive scores predicted higher pain intensity and, to a lesser extent, neuropathic symptoms.
• These associations remained significant independently of affective variables and were consistent even in patients without pre-surgical pain.

Conclusions:

• This study provides the first evidence that pre-operative cognitive limitations in flexibility and memory may contribute to the mechanisms of chronic pain development and its neuropathic characteristics.
• Deficits in executive functioning or memory may indicate a higher risk for developing chronic pain after a painful event.
• Cognitive assessment could potentially identify individuals at higher risk for chronic pain post-surgery.