Introduction:
There is limited knowledge on cognitive performance in Behçet’s disease (BD), the majority of which come from patients with neuro-Behçet’s disease. However, the influence of BD on cognitive function in patients without neurological involvement is still not well understood. The aim of the study was to determine the frequency of cognitive involvement in BD patients without evident neuropsychiatric symptoms and to identify associated clinical variables in those patients.

Material and methods:
Forty BD patients who fulfilled the diagnostic International Criteria for Behçet ‘s Disease (ICBD) without obvious neuropsychiatric manifestations were studied and compared with forty healthy controls matched for age, sex, and education. A comprehensive medical history, rheumatological, neurological, psychiatric, and psychometric assessment were applied for all patients. Behçet’s disease Current Activity Form (BDCAF) was used to assess disease activity. For patients as well as controls, validated Arabic versions of the Wechsler Adult Intelligence Scale-Revised and Wechsler Memory Scale-Revised were used for assessment of cognitive function. Anxiety and depression were additionally assessed for both groups using the anxiety and depression subdivisions of the Arabic Version of Symptom Checklist 90 Revised.

Results:
Cognitive impairment was identified in 37.5% of BD patients compared to none of the controls. Memory represents the cognitive domain most frequently affected. Cognitive involvement was significantly associated with current corticosteroid use and depression as measured by SCL-90-R. On the other hand, neither the activity of the disease nor the level of anxiety was associated with cognitive involvement.

Conclusions:
Cognitive dysfunction is reported in BD patients distinctly and independently of clinically overt neurologic involvement. Prevalence of cognitive impairment in patients with BD is strikingly high at 37.5%, whereas the control group exhibited no such signs. Psychological assessment should be performed for every BD patient to reveal any cognitive involvement. It is highly recommended to encourage psychological intervention to prevent any further deterioration, especially in patients who are experiencing depression or currently using corticosteroids.