Impact of Cognitive, Functional, Behavioral Disorders, and Caregiver Burden on the Risk of Nursing Home Placement

International audienceObjectives: To estimate the attributable fraction of nursing home placement associated with cognitive impairment, neuropsychiatric symptoms, behavioral disorders, functional limitations, and caregiver burden.Design: Longitudinal study conducted on the "MEMORA cohort" linked with both regional public health insurance and hospital discharge databases.Setting: Memory center at the University Hospital of Lyon, France.Participants: A sample of 2456 outpatients attending the memory center between 2012 and 2017.Measures: Cognitive impairment, functional limitations, neuropsychiatric symptoms/behavioral disorders, and caregiver burden were measured with the Mini-Mental State Examination, the Instrumental Activities of Daily Living scale, the Neuropsychiatric Inventory (NPI), and a short version of the Zarit Burden Inventory, respectively. Sociodemographics characteristics were collected during the first visit. Comorbidities were gathered from the hospital discharge database. Dates of nursing home placement were obtained from the public health insurance database.Results: More than 38% of nursing home placements were attributable to caregiver burden, and the attributable fraction associated with functional limitations exceeded 35%. Between 20% and 25% of nursing home placements were due to cognitive impairment whereas less than 16% were attributable to neuropsychiatric symptoms or behavioral disorders. The associations between anxiety or agitation and nursing home placement were mediated by caregiver burden. Apathy or aberrant motor behaviors were associated with a higher risk of nursing home placement independently of caregiver burden.Conclusions/implications: Our findings suggest that a high proportion of nursing home placements are attributable to caregiver burden and functional limitations in outpatients attending a memory center. Cognitive impairment and neuropsychiatric symptoms or behavioral disorders contribute less to nursing home placements. Interventions directed to delay nursing home placement should emphasize actions toward reducing caregiver burden and functional limitations of patients