Abstract：Objective To compare the correlations between power Doppler and Disease Activity Score with 28 joints (DAS28) by estimating the value of the activity of rheumatoid arthritis (RA).Methods Seventy-four cases of RA patients were selected. The power Doppler signals of knee joints were recorded. The number of cases of swelling of 28 joints, the number of cases of tenderness of the 28 joints, erythrocyte sedimentation(ESR) and C-reactive protein(CRP) were recorded. The patients were evaluated according to the 100mm visual analogue scale (VAS) in order to calculate the DAS28 score. According to the intensity of signals, the ultrasound doctor performed a power Doppler examination on the swollen knees of the patients and divided them into four groups.Results A total of seventy-four patients with RA were enrolled, including one knee (1%) without blood flow signals, two patients (3%)with a small number of punctate signals, thirty-two cases (43%) with a large number of short-striped blood flow signals and thirty-nine cases (44%) with dendritic signals. A comparison with signals of power Doppler revealed that power Doppler well conformed to DAS28 (DAS28-ESR κ=0.701,P<0.05;DAS28-CRPκ=0.777,P<0.05).Conclusions The disease activity of RA can be evaluated with power Doppler.
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