Scores for all seasons: SDAI and CDAI

Area of Science:

• Rheumatology
• Clinical Medicine
• Epidemiology

Background:

• Accurate assessment of rheumatoid arthritis (RA) disease activity is essential for effective patient management.
• Composite measures, incorporating multiple disease facets, are superior to individual assessments.
• Joint counts in composite scores correlate with joint damage and physical function, making them preferable.

Purpose of the Study:

• To highlight the importance of composite measures in RA disease activity assessment.
• To discuss the utility of the simplified disease activity index (SDAI) and clinical disease activity index (CDAI).
• To emphasize the significance of remission criteria in RA management.

Main Methods:

• Review of composite disease activity measures in Rheumatoid Arthritis.
• Focus on simplified disease activity index (SDAI) and clinical disease activity index (CDAI).
• Analysis of established cutpoints for disease activity states and improvement criteria.

Main Results:

• SDAI and CDAI are easy to calculate and correlate well with joint damage and physical function.
• Stringent ACR-EULAR remission criteria using SDAI/CDAI are associated with halted disease progression.
• RA remission is achievable in a significant proportion of patients, both in clinical practice and trials.

Conclusions:

• Composite indices like SDAI and CDAI are pivotal for RA disease activity assessment.
• Achieving remission, defined by SDAI/CDAI criteria, is linked to improved long-term outcomes.
• These indices provide valuable tools for monitoring RA and guiding treatment decisions.