Objective: To analyse the clinical and laboratory characteristics of antinuclear antibody (ANA) positive rheumatoid arthritis (RA) patients.
Methods: The clinical and laboratory data of 428 RA cases from Department of of Rheumatology and Immunology Peking University Third Hospital from Jan 2013 to Dec 2018 were collected and used to analyse characters between ANA positive group and ANA negative group. T test was used for the quantitative data in accordance with normal distribution. Wilcoxon rank sum test was used for the quantitative data of non normal distribution. The qualitative data were analyzed by chi square test. But while 1≤theoretical frequency < 5, chi square test of corrected four grid table was used. And Fisher exact probability method was used when theoretical frequency < 1.
Results: The number of ANA positive group was 231 (54%). The female rate was obviously higher in ANA positive group (82.7% vs. 63.5%, χ2=20.355, P < 0.01). The rate of metatarsophalangeal joints (MTPJs) involvement was lower in ANA positive group (22.1%) than in ANA negative group (33.0) (χ2=6.414, P < 0.05). The incidence of secondary Sjögren's syndrome (sSS) was much higher in ANA positive group(19.5% vs. 4.1%, χ2=23.300, P < 0.01). The positivity of rheumatoid factor (RF), as well as the positivity of anti-cyclic citrullinated peptide(CCP) antibody was much higher in ANA positive group (77.1% vs. 53.8%, χ2=25.743, P < 0.01, 74.9% vs. 59.4%, χ2=11.694, P < 0.01, respectively). The levels of immunoglobulin G (IgG) and immunoglobulin M (IgM) of ANA positive group were higher [(15.1±5.1) g/L vs. (13.8±5.3) g/L, t=2.359, P < 0.05, 1.25 (0.92) g/L vs. 1.05 (0.65) g/L, Z=-3.449, P < 0.01, respectively]. But the levels of hemoglobin (Hb) and platelet (PLT) was lower in ANA positive group[(109.64±17.98) vs. (114.47±18.48) g/L, t=-2.734, P < 0.01; (266.4×109±104.6×109) vs. (295.9×109±100.1×109) /L, t=-2.970, P < 0.01, respectively].
Conclusion: The incidence of sSS was obviously higher in ANA positive group than in ANA negative group. Serum IgG of ANA positive group was higher, but Hb and PLT were lower.
目的: 分析抗核抗体(anti-nuclear antibodies, ANA)阳性类风湿关节炎(rheumatoid arthritis，RA)患者的临床及实验室检查特征。
方法: 选择2013年1月—2018年12月于北京大学第三医院风湿免疫科住院的428例RA患者的临床及实验室检查资料，回顾性分析ANA阳性RA患者的临床和实验室检查指标的特点。统计学方法符合正态分布的定量资料采用t检验，非正态分布的定量资料采用Wilcoxon秩和检验。定性资料采用χ2检验，1≤理论频数＜5采用校正四格表χ2检验，理论频数＜1采用确切概率法。
结果: 收集到ANA阳性患者共231例(54%)，ANA阳性组中女性占比明显多于ANA阴性组(82.7% vs. 63.5%，χ2=20.355，P＜0.01);ANA阳性组出现跖趾关节受累(22.1%)低于ANA阴性组(33.0%，χ2=6.414，P＜0.05)，ANA阳性组中合并继发性干燥综合征(secondary Sjögren's syndrome, sSS)的比例显著高于ANA阴性组(19.5% vs. 4.1%, χ2=23.300，P＜0.01);ANA阳性组合并类风湿因子(rheumatoid factor, RF)阳性(77.1% vs. 53.8%, χ2=25.743，P＜0.01)及抗环瓜氨酸多肽(cyclic citrullinated peptide，CCP)抗体阳性(74.9% vs. 59.4%, χ2=11.694，P＜0.01)的比例均显著高于阴性组。ANA阳性组免疫球蛋白G(immunoglobulin G，IgG)水平[(15.1±5.1) g/L vs. (13.8±5.3) g/L, t=2.359, P＜0.05]及免疫球蛋白M(immunoglobulin M，IgM)水平[1.25(0.92) g/L vs.1.05(0.65) g/L, Z=-3.449, P＜0.01]高于阴性组，而血红蛋白(hemoglobin, Hb)水平[(109.64±17.98) vs. (114.47±18.48) g/L，t=-2.734, P＜0.01]、血小板(platelet, PLT)水平[(266.4×109±104.6×109) vs. (295.9×109±100.1×109) /L，t=-2.970, P＜0.01]低于阴性组。
结论: ANA阳性RA患者合并sSS的比例显著高于ANA阴性者，前者IgG水平更高，而Hb及PLT水平则更低。
Keywords: Rheumatoid arthritis, antinuclear antibody; Rheumatoid factor, anti-cyclic citrullinated peptide antibody; Secondary Sjögren's syndrome.