Persistent moderate to severe pain and long-term cognitive decline

Area of Science:

• Neuroscience
• Gerontology
• Public Health

Background:

• The link between persistent moderate to severe pain and long-term cognitive decline in older adults is not fully understood.
• Research is needed to clarify the longitudinal association between chronic pain and cognitive function in aging populations.

Purpose of the Study:

• To investigate the longitudinal association between persistent moderate to severe pain and cognitive decline in adults aged 50 and older.
• To determine if pain severity influences the rate of cognitive decline over time.

Main Methods:

• Utilized data from the English Longitudinal Study of Ageing, a prospective cohort of community-dwelling adults aged 50+.
• Defined persistent moderate to severe pain as pain intensity scores ≥5 at two consecutive waves (2002/2003 and 2004/2005).
• Assessed cognitive function using standardized global cognitive Z scores derived from verbal memory, temporal orientation, and semantic fluency over a median follow-up of 12 years.

Main Results:

• A total of 6,869 participants were included, with pain and cognitive data collected over multiple waves.
• Each 5-point increase in pain intensity scores was associated with a faster rate of cognitive decline (-0.009 SD/year).
• Persistent moderate to severe pain was significantly associated with a faster decline in global cognitive Z scores (-0.031 SD/year) compared to no pain.

Conclusions:

• Persistent moderate to severe pain in older adults is associated with accelerated cognitive decline.
• A dose-response relationship exists, where more severe pain leads to faster cognitive decline across multiple domains.
• Clinicians should consider monitoring cognitive function in older adults experiencing persistent pain.