Volume 73, Issue 10 p. 1436-1443
Original Article

Cognitive Function Trajectories in Association With the Depressive Symptoms Trajectories in Systemic Lupus Erythematosus Over Time

Zahi Touma

Corresponding Author

Zahi Touma

Toronto Western Hospital and University of Toronto, Toronto, Ontario, Canada

Address correspondence to Zahi Touma, MD, PhD, Division of Rheumatology, Department of Medicine, Institute of Health Policy, Management and Evaluation, University of Toronto, Toronto, Ontario, Canada (email: [email protected]); or to Patricia Katz, PhD, Professor of Medicine and Health Policy, Division of Rheumatology, Department of Medicine, Philip R. Lee Institute for Health Policy Studies, University of California San Francisco, San Francisco, CA 94143 (email: [email protected]).

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Bahar Moghaddam

Bahar Moghaddam

Toronto Western Hospital and University of Toronto, Toronto, Ontario, Canada

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Jiandong Su

Jiandong Su

Toronto Western Hospital and University of Toronto, Toronto, Ontario, Canada

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Patricia Katz

Corresponding Author

Patricia Katz

University of California San Francisco

Address correspondence to Zahi Touma, MD, PhD, Division of Rheumatology, Department of Medicine, Institute of Health Policy, Management and Evaluation, University of Toronto, Toronto, Ontario, Canada (email: [email protected]); or to Patricia Katz, PhD, Professor of Medicine and Health Policy, Division of Rheumatology, Department of Medicine, Philip R. Lee Institute for Health Policy Studies, University of California San Francisco, San Francisco, CA 94143 (email: [email protected]).

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First published: 11 June 2020
Citations: 15
The Lupus Outcomes Study was supported by the NIH/National Institute of Arthritis and Musculoskeletal and Skin Diseases (grant AR053308). Dr. Touma’s work was supported by the Arthritis Society Salary Support and by the Canadian Rheumatology Association Arthritis Society Clinician Investigator Salary Award.
No potential conflicts of interest relevant to this article were reported.

Abstract

Objective

Cognitive function may change over time in patients with systemic lupus erythematosus (SLE), and cognitive function trajectories have not been well studied. We aimed to identify cognitive function trajectories in SLE and describe them with depressive symptoms trajectories, and we also aimed to identify baseline factors associated with class membership in the dual trajectories.

Methods

Longitudinal data from the University of California San Francisco Lupus Outcomes Study were analyzed. Two outcome trajectories were studied jointly, the Hopkins Verbal Learning Test–Revised and the Center for Epidemiologic Studies Depression Scale (CES-D) (administered annually). Univariate/multivariable logistic regression analyses examined baseline factors associated with class memberships.

Results

A total of 755 patients were studied, and 4 latent classes were identified: 1) low CES-D scores and low cognitive scores (no depression plus cognitive impairment; 20%), 2) lowest CES-D scores and highest normal cognitive scores (no depression plus normal cognition; 48%), 3) highest CES-D scores and lowest cognitive scores (depression plus cognitive impairment; 9%), and 4) high CES-D scores and cognitive score at borderline (depression plus borderline cognition; 23%).

Conclusion

In all, 4 distinct classes of dual cognitive function and depressive symptoms were identified. Persistently low cognitive performance in 28% of patients (classes 1 and 3) did not significantly improve over 7 years. Cognitive impairment was associated with depression status in 9% of patients (class 3). Other factors also predicted latent class membership: ethnicity, education, disease activity, physical functioning, and bodily pain. These results highlight the importance of periodic assessment of cognitive function and of different aspects relevant for assessing and managing cognitive function over time in SLE.