Long-term rate of change in memory functioning before and after stroke onset

Area of Science:

• Neurology
• Gerontology
• Cognitive Science

Background:

• Memory impairment is a known consequence of stroke.
• Age-related memory decline is common in elderly individuals.
• Stroke survivors and stroke-free individuals experience different memory trajectories.

Purpose of the Study:

• To compare long-term memory changes before and after stroke.
• To analyze memory decline in stroke survivors versus stroke-free elderly individuals.
• To investigate memory trajectory differences based on stroke survival.

Main Methods:

• Utilized Health and Retirement Study data from 17,340 participants aged 50+.
• Analyzed biennial interviews for up to 10 years, identifying 1,574 first-time stroke cases.
• Employed segmented linear regression to compare memory decline rates in stroke survivors, decedents, and stroke-free groups.

Main Results:

• Individuals who later survived stroke showed faster prestroke memory decline (-0.143/year) than stroke-free peers (-0.101/year).
• Stroke decedents exhibited even steeper prestroke memory decline (-0.212/year).
• Post-stroke memory decline in survivors (-0.142/year) mirrored their prestroke rates, with pre-stroke memory accounting for 50% of the immediate post-stroke deficit.

Conclusions:

• Significant memory differences emerge years prior to stroke onset.
• Prestroke memory decline is a critical factor, especially pronounced in those who do not survive stroke.
• Memory decline trajectories differ substantially between stroke-affected and stroke-free elderly individuals.