Measuring Frailty in Systemic Lupus Erythematosus.

Area of Science:

• Rheumatology and Gerontology
• Clinical Epidemiology

Background:

• Frailty is increasingly recognized as a significant factor in systemic lupus erythematosus (SLE).
• Multiple instruments exist to assess frailty, but their agreement and predictive value in SLE are not fully understood.

Purpose of the Study:

• To evaluate the agreement among different frailty measures in SLE patients.
• To determine the association of each frailty measure with cross-sectional and longitudinal health outcomes.

Main Methods:

• Utilized data from the California Lupus Epidemiology Study.
• Assessed frailty using Systemic Lupus International Collaborating Clinics Frailty Index (SLICC-FI), Short Physical Performance Battery (SPPB), and Fatigue, Resistance, Ambulation, Illness, and Loss of Weight (FRAIL) scale.
• Patient-Reported Outcomes Measurement Information System Physical Function 10a (PF) was used as a proxy; statistical analyses included regression and Cox proportional hazards models.

Main Results:

• Prevalence of frailty varied significantly across measures (10.8%–45.9%), with slight to substantial agreement (k=0.17–0.63).
• Most frailty measures correlated with cross-sectional and longitudinal health outcomes, except for SPPB.
• SLICC-FI showed the most consistent associations, followed by FRAIL and PF, linking frailty to hospitalization, disability, and cognitive impairment.

Conclusions:

• Multiple frailty assessment tools can identify patients at risk for adverse health outcomes in SLE.
• The choice of frailty measure should consider its intended application, simplicity, and ease of implementation.