Exploring Factors Associated With Cognitive Impairment in Rheumatoid Arthritis.

Abstract

Cognitive impairment is prevalent in rheumatoid arthritis (RA), yet risk factors are not well understood. We explored associations between clinical characteristics and cognitive impairment in an RA cohort. Data were from a longitudinal RA cohort at Veterans Affairs Puget Sound Health Care System. Cognition was evaluated using the Saint Louis University Mental Status (SLUMS) examination. Demographics and health factors, objectively measured physical function, participant-reported symptoms, RA disease characteristics, and comorbidities were evaluated. Univariable linear regressions explored the association between clinical factors and SLUMS scores. Those with P < 0.1 in the univariable models were evaluated in separate multivariable linear regressions controlling for age, sex, and years of education. A total of 145 participants with RA were included, with a mean age of 64.5 (SD 11.6) years, and were predominantly male (74%). Using SLUMS, 42 participants (29%) had normal cognition, 83 (57%) had mild cognitive impairment, and 20 (14%) had dementia. Physical performance (aβ: 0.35, confidence interval [CI] 0.11 to 0.59), self-reported exhaustion (aβ: -2.22, CI -3.44 to -0.99), pain (aβ: -0.25, CI -0.50 to -0.00), disability (aβ: -1.79, CI -3.16 to -0.42), and trouble falling asleep (aβ: -2.57, CI -4.00 to -1.14) were all independently associated with a lower SLUMS score (all P < 0.05). Cognitive impairment was prevalent in our cohort of veterans with RA and was associated with several modifiable clinical factors. Future longitudinal studies are needed to determine the directionality of these associations and evaluate interventions for modifiable risk factors that may mitigate cognitive dysfunction.