抗环瓜氨酸肽抗体和隐匿性类风湿因子免疫球蛋白M型在诊断早期幼年类风湿关节炎中的意义

目的 检测抗环瓜氨酸肽(CCP)抗体及隐匿性类风湿因子IgM型(HRF-IgM),并探讨其在幼年类风湿关节炎(JRA)早期诊断中的临床意义。方法 用人工合成CCP链为抗原检测抗CCP抗体;对27例早期诊断的JRA做动态检测,通过阳性预测值(PPV)和阴性预测值(NPV)确定抗CCP抗体和HRF-IgM对早期诊断的JRA的特异性和敏感性。结果 抗CCP抗体和HRF-IgM总阳性率分别为58.5％、65.0％。后者敏感性要高于前者,病情越重或受累的关节越多,抗体检出率越高。对早期JRA的PPV、抗CCP抗体特异性要高于HRF-IgM。当两种实验联合应用时,对具有早期关节炎表现发展成JRA的PPV为93.7％。结论 抗CCP抗体和HRF-IgM在JRA患儿均有较高的检出率,并与疾病严重程度有关。抗CCP抗体与HRF-IgM联合应用时,可使JRA的PPV进一步提高。

Diagnostic significance of combined testing of anti-cyclic citrullinated peptide antibody and hidden rheumatoid factor immunoglobulin M in patients with juvenile rheumatoid arthritis

Objective To explore the early diagnostic significance of anti-cyclic citrullinated peptide(CCP) antibody and hidden rheumatoid factor immunoglobulin M(HRF-IgM) detected by ELISA in patients with juvenile rheumatoid arthritis(JRA). Methods The synthesized CCP was used as the antigen to detect anti-CCP antibody. Anti-CCP antibody and HRF-IgM were detected dynamically in 27 patients with early diagnosed JRA and their specificity and sensitivity were determined for early diagnosed JRA by calculating the positive predicting value (PPV) and negative predicting value (NPV). Results The total positive rate of anti-CCP antibody and HRF-IgM were 58.5 % and 65.0 % respectively in patients with JRA. The sensitivity of HRF-IgM was more predominant than that of anti-CCP antibody. There was a positive correlation between the positive rate of antibodies and the subtype of JRA. The specificity of anti-CCP antibody for predicting early JRA was superior to that of HRF-IgM. When using these two tests in combination, the PPV predicting rate of early JRA was 93.7 % . Conclusions Both anti-CCP antibody and HRF-IgM are elevated in patients with JRA, which show positive correlations with the subtype of the disease. The specificity of anti-CCP antibody testing is considerably higher for diagnosing early JRA, and when it was used together with HRF-IgM testing, the PPV for JRA can be raised further.