Social networks in mild-to-moderate Alzheimer disease: longitudinal relationships with dementia severity, cognitive function, and adverse events.

Objectives: Poor social networks are associated with a greater likelihood of cognitive decline, dementia, and other adverse health outcomes in later life. However, these relationships have been poorly explored in those with established Alzheimer Disease (AD), who may represent a particularly vulnerable group.
Methods: Analysis of data from the NILVAD study. We assessed social networks (Lubben Social Network Scale [LSNS]), cognition (Alzheimer's disease Assessment Scale [ADAS-Cog]) and dementia severity (Clinical Dementia Rating, Sum of Boxes [CDR-Sb]) in older adults with mild-moderate AD at baseline and at 18 months.
Results: 464 participants with mild-to-moderate AD were included (73.1 ± 8.3 years; 61.9% female). At baseline, a poor social network was significantly associated with a greater dementia severity, but not greater cognitive impairment. Rather than a poor social network predicting greater cognitive decline over 18 months, a greater baseline dementia severity predicted a decline in social network over 18 months (β: -0.22, -0.42 - -0.02, p = 0.034). Finally, a poor social network was associated with a significantly increased likelihood of experiencing serious adverse events (IRR: 1.41, 1.06-1.89, p = 0.019).Discussion: As dementia progresses, older adults with AD are more likely to experience a decline in social network. Further, having a poor social network was associated with a greater likelihood of experiencing serious adverse events. These findings add novel insight into the complex relationship between social networks, dementia progression and adverse events in AD, and underscore the importance of developing and maintaining social networks in AD.