Claim

Among seropositive rheumatoid arthritis patients who reach CDAI low disease activity, persistent power Doppler synovitis on ultrasound will predict 12-month radiographic progression better than CDAI category alone.

Rationale

Clinical composite scores may underestimate residual synovial inflammation. Power Doppler signal can persist despite acceptable joint counts and patient global scores, suggesting that some patients classified as controlled still carry biologically relevant inflammatory activity.

Testable design

• Prospective cohort of adults with seropositive RA in CDAI low disease activity after DMARD optimization
• Baseline and 6-month ultrasound power Doppler scoring of predefined hand/wrist joints
• Radiographic progression at 12 months using van der Heijde-modified Sharp score
• Compare models using CDAI alone versus CDAI plus persistent Doppler signal

Falsifiable prediction

Persistent Doppler activity will independently predict progression and improve AUROC by at least 0.05 versus CDAI-only models.

References

1. Brown AK, et al. Presence of significant synovitis in rheumatoid arthritis patients with disease-modifying antirheumatic drug-induced clinical remission. Arthritis Rheum. 2006;54(12):3761-3773. DOI: 10.1002/art.22274
2. Saleem B, et al. Can flare be predicted in DMARD treated RA patients in remission? Arthritis Rheum. 2012;64(8):2625-2631. DOI: 10.1002/art.34463
3. Smolen JS, et al. EULAR RA management update. Ann Rheum Dis. 2023;82:3-18. DOI: 10.1136/ard-2022-223356