The association between disease activity and duration in systemic sclerosis

Area of Science:

• Rheumatology
• Immunology
• Clinical Research

Background:

• Systemic sclerosis (SSc) research is hindered by the lack of a standardized disease activity index.
• The Valentini Scleroderma Disease Activity Index (SDAI) has been developed to address this gap.
• Understanding disease activity progression and its determinants is crucial for effective SSc management.

Purpose of the Study:

• To apply the newly derived Valentini Scleroderma Disease Activity Index (SDAI) in a cohort of SSc patients.
• To document changes in SSc disease activity over time using the SDAI.
• To assess differences in disease activity between limited and diffuse SSc subtypes.

Main Methods:

• A cross-sectional study utilizing the Canadian Scleroderma Research Group Registry.
• Disease activity was quantified using the Valentini Scleroderma Disease Activity Index (SDAI).
• Depression was assessed using the Centre for Epidemiologic Studies Depression Scale (CES-D).

Main Results:

• SDAI scores decreased significantly within the first 5 years post-disease onset.
• Patients with diffuse SSc exhibited 42% higher SDAI scores compared to those with limited SSc, controlling for disease duration and depression.
• Higher depression scores (CES-D) correlated with increased SDAI scores, particularly impacting patient-reported outcomes.

Conclusions:

• SSc disease activity diminishes over time, with diffuse SSc patients consistently showing higher activity levels.
• Depression is linked to elevated patient-reported activity scores and influences self-assessment components of the SDAI.
• The influence of depression on SDAI scores, especially patient-reported elements, warrants careful consideration in future research and clinical applications.