Objectives
To compare the cognitive ability of people with rheumatoid arthritis (RA) with healthy controls (HCs).
Methods
People with RA were recruited from the Norfolk Arthritis Register (NOAR), a population-based cohort study of people with inflammatory arthritis. Data on aged-matched HCs (people with no cognitive impairment) came from the comparison arm of The Dementia Research and Care Clinic Study (TRACC). People with RA and HCs performed a range of cognitive ability tasks assessing: attention, memory, verbal fluency, language, visuospatial skills, emotional recognition, executive function and theory of mind. A score of < 88 on the Addenbrooke’s Cognitive Examination-III (ACE-III) was considered cognitive impairment. Scores were compared using linear regression adjusting for age, gender, smoking status, education, body mass index, anxiety and depression.
Results
Thirty-eight people with RA (mean [standard deviation (SD)] age: 69.1 [8.0]; 25 [65.8%] women) were matched with 28 HCs (mean [SD] age: 68.2 [6.4]; 15 [53.6%] women). Twenty-three (60.5%) people with RA were considered to have mild cognitive impairment (mean [SD] ACE-III: RA = 85.2 [7.4], HC = 96.0 [2.5]). People with RA had impairments in memory, verbal fluency, visuospatial functioning, executive function, and emotional recognition in faces compared with HCs, after adjustment for confounders.
Conclusions
People with RA had cognitive impairments in a range of domains. People with RA may benefit from cognitive impairment screening to allow for early administration of appropriate interventions.