Late-Onset Suicide: A Dementia Prodrome?

Area of Science:

• Neuroscience
• Gerontology
• Psychiatry

Background:

• Suicidal behavior in older adults is a significant public health concern.
• Cognitive impairment is increasingly recognized as a risk factor for suicidal behavior in aging populations.
• Distinguishing between early-onset and late-onset suicidal behavior may reveal different underlying neurobiological mechanisms.

Purpose of the Study:

• To investigate the association between late-onset (age 55+) versus early-onset suicidal behavior and cognitive functioning in adults aged 50 and older.
• To compare cognitive performance across different groups: nonpsychiatric controls, depressed older adults without suicidal ideation, depressed individuals with suicidal ideation, and suicide attempters categorized by onset age.

Main Methods:

• A case-control study design was employed with 278 participants aged 50+.
• Cognitive domains assessed included global cognition, episodic memory, processing speed, and executive functioning using standardized neuropsychological tests.
• Linear regression analyses were used to examine group differences in cognitive performance.

Main Results:

• Both early-onset and late-onset suicide attempter groups exhibited poorer executive functioning compared to non-suicidal depressed older adults.
• Late-onset suicide attempters demonstrated significantly worse global cognition and processing speed than non-suicidal depressed older adults.
• Late-onset attempters also showed poorer memory performance when compared to early-onset attempters.

Conclusions:

• Late-onset suicidal behavior in older adults is associated with widespread cognitive deficits.
• The observed cognitive impairments may represent a prodromal stage of dementia in individuals with late-onset suicidal behavior.
• These findings underscore the importance of comprehensive cognitive assessment in older adults presenting with suicidal behavior.