血清抗黑色素瘤分化相关基因5阳性皮肌炎胸部CT特征定性及定量分析

Qualitative and Quantitative Analysis of Chest CT Features of Anti-MDA5 Antibody Positive Dermatomyositis

目的 定性及定量分析血清抗黑色素瘤分化相关基因5(MDA-5)抗体阳性的皮肌炎患者胸部CT特征及其与短期预后的关系。资料与方法 回顾性纳入2017年1月—2018年12月中日友好医院收治的67例MDA-5阳性的皮肌炎患者,分析胸部CT特征与短期不良预后的关系。结果 9例患者1年内死亡。死亡组与存活组间质性肺疾病(ILD)影像学类型(χ^(2)=9.964,P=0.025)和肺动脉直径/主动脉直径比值(U=103.0,P=0.004)差异有统计学意义。抗MDA-5抗体阳性的皮肌炎患者合并ILD影像学类型主要为机化性肺炎。弥漫性肺泡损伤的患者死亡率显著高于其他几种类型。Logistic回归分析显示,肺动脉直径/主动脉直径比值(OR 4.208,P=0.002)是抗MDA-5抗体阳性的皮肌炎合并ILD患者发生死亡的强独立危险因素。结论 MDA-5阳性皮肌炎患者大部分伴ILD,其中以机化性肺炎为主要特征。1年内不良预后患者ILD类型不同,但肺动脉直径/主动脉直径比值是MDA-5阳性皮肌炎合并ILD患者发生死亡的独立危险因素。

Purpose To observe the CT imaging features of dermatomyosistis patients with anti-melanoma differentiation related genes 5(MDA-5),and to analyze the relationship between CT imaging indicators and short-term prognosis of patients.Materials and Methods Sixty-seven MDA-5-positive dermatomyosistis patients admitted to China-Japan Friendship Hospital from January 2017 to December 2018 were retrospectively included.Prognosis of included patients in one year were followed-up.Analysis of the relationship between chest CT imaging and short-term poor prognosis.Results Among 67 patients,nine patients died in one year.There was a statistically significant difference between the two groups(the death group and the survivor group)in the interstitial lung disease(ILD)imaging types(χ^(2)=0.198,P=0.025)and pulmonary/aortic diameter ratios(U=103.0,P=0.004).CT imaging of dermatomyosistis-ILD with anti-MDA5 antibody positive patients showed organizing pneumonia.Mortality of diffuse alveolar damage type was significantly higher than that of other types.Logistic regression analysis showed that pulmonary/aortic diameter ratio(OR:4.208,P=0.002)was a strong independent risk factor for the death of patients with anti-MDA5 antibody.Conclusion Most patients with anti-MDA5 antibody positive dermatomyositis show ILD,with the main feature of organic pneumonia.Patients with poor prognosis within 1 year have different types of ILD,while the pulmonary/aortic diameter ratio is a strong independent risk factor for the death of dermatomyosistis-ILD with anti-MDA5 antibody positive patients.