Application value of Doppler ultrasound in early active axial spondyloarthropathy / 中国医学影像技术

ABSTRACT

Objective s To investigate the value of Doppler ultrasound in diagnosing active sacroiliitis of axial spondyloarthropathy (axSpA) patients.Methods The Doppler ultrasound and MRI data of 51 patients with early axSpA was retrospectively analyzed.According to MRI results,axSpA patients were divided into active sacroiliitis (active group) and inactive sacroiliitis (inactive group).The color flow display and blood flow resistance index (RI) were compared.Considering MRI as the diagnostic standard,ROC curve was used to evaluate the diagnostic efficacy of RI in detecting active sacroiliitis.Results There were 32 cases wth 58 joints (6 cases were single active sacroiliitis) in activity group and 19 cases with 38 joints in inactivity group.The flow signals demonstration rate of sacroiliac joint in activity group (51/58,87.93％) was higher than that in inactive group (26/38,68.42％;x2 =5.505,P=0.019).There was no statistical difference of the indegree of blood flow between the two groups (Z=-1.93,P=0.053).RI in active group (0.59±0.08) was lower than that in inactive group (0.71±0.09;t=-6.04;P＜0.001).Taking RI=0.64 for diagnosis of active sacoriliitis in axSpA patients,the sensitivity,specificity and accuracy rate were 80.8％,74.5％ and 78.7％,respectively.Conclusion Through observing abnormal blood flow signals around and internal the sacroiliac joints,ultrasonography can response active sacroiliitis in axSpA patients with higher accuracy.