Reliability of ultrasound grading traditional score and new global OMERACT-EULAR score system (GLOESS): results from an inter- and intra-reading exercise by rheumatologists.

This study aims to test the reliability of ultrasound to graduate synovitis in static and video images, evaluating separately grayscale and power Doppler (PD), and combined. Thirteen trained rheumatologist ultrasonographers participated in two separate rounds reading 42 images, 15 static and 27 videos, of the 7-joint count [wrist, 2nd and 3rd metacarpophalangeal (MCP), 2nd and 3rd interphalangeal (IPP), 2nd and 5th metatarsophalangeal (MTP) joints]. The images were from six patients with rheumatoid arthritis, performed by one ultrasonographer. Synovitis definition was according to OMERACT. Scoring system in grayscale, PD separately, and combined (GLOESS-Global OMERACT-EULAR Score System) were reviewed before exercise. Reliability intra- and inter-reading was calculated with Cohen's kappa weighted, according to Landis and Koch. Kappa values for inter-reading were good to excellent. The minor kappa was for GLOESS in static images, and the highest was for the same scoring in videos (k 0.59 and 0.85, respectively). Excellent values were obtained for static PD in 5th MTP joint and for PD video in 2nd MTP joint. Results for GLOESS in general were good to moderate. Poor agreement was observed in 3rd MCP and 3rd IPP in all kinds of images. Intra-reading agreement were greater in grayscale and GLOESS in static images than in videos (k 0.86 vs. 0.77 and k 0.86 vs. 0.71, respectively), but PD was greater in videos than in static images (k 1.0 vs. 0.79). The reliability of the synovitis scoring through static images and videos is in general good to moderate when using grayscale and PD separately or combined.

Hypervascular synovitis and American College of Rheumatology Classification Criteria as predictors of radiographic damage in early rheumatoid arthritis.

UNLABELLED: To investigate if serial clinical and ultrasound evaluations differ between early rheumatoid arthritis patients who do or do not develop erosive disease and to identify predictors of erosions. METHODS: Patients with at least 7 consecutive 2-monthly clinical and 3 consecutive 6-monthly ultrasound evaluations were included. Ultrasound (gray scale and power Doppler) assessed synovitis, power Doppler-positive synovitis (PD+) and power Doppler-negative synovitis (PD-) in each of 14 joints of the dominant hand. After 1 and 2 years, erosive disease was defined according to digitized radiography. Areas under the curve (AUCs) for serial assessments were calculated. Multivariate logistic regression analysis was performed. RESULTS: Seventy-one and 38 patients completed 1- and 2-year consecutive assessments. After 2 years (21.5 +/- 6.2 months), 13 patients developed erosions. At baseline, nonerosive patients had shorter duration of symptoms to RA diagnosis, lower number of the American College of Rheumatology (ACR) classification criteria, lesser synovitis and PD+ synovitis than erosive patients. At follow-up, erosive and nonerosive patients showed similar AUC for clinical, serological, and treatment parameters; erosive patients had higher AUCs for synovitis and PD+ synovitis than nonerosive patients. In the multivariate model, the amount of PD+ synovitis (odds ratio, 1.3; 95% confidence interval, 1.11-1.51; P = 0.001) and more ACR classification criteria (odds ratio, 2.3; 95% confidence interval, 1.05-5.02; P = 0.04), both at baseline, predicted erosive disease. CONCLUSIONS: Serial Power Doppler ultrasonography-assessed synovitis was greater in patients who developed erosions than in those who did not. More power Doppler positive (hypervascular) synovitis and more ACR classification criteria, both at baseline, were the only predictors of erosions.