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胸腔病例(三八三)抗MDA5抗體陽性皮肌炎併間質性肺病

摘要


抗MDA5(anti-melanoma differentiation-associated gene 5)的自體抗體可在10%至25%的皮肌炎患者中檢測到,抗MDA5抗體陽性的患者是皮肌炎患者中的特殊亞型,他們具有較顯著的皮膚病灶,較輕微的肌肉發炎、甚至可能沒有肌肉侵犯,血液中鐵蛋白(ferritin)會升高,常常伴隨著快速進展性間質性肺病(rapidly progressive interstitial lung disease, RP-ILD)和不良的預後。因為發生率並不高,且檢驗價格昂貴,並非每家醫院都能檢測此抗體,因此臨床診斷率不高。一但這些患者出現間質性肺病(interstitial lung disease, ILD)後,臨床上常在某個時間點快速惡化成急性呼吸窘迫症候群,目前無特別有效的治療,死亡率顯著上升。本文藉由病例報告增加對這個疾病的認識,提醒臨床醫師保持警覺,早日診斷與治療。

參考文獻


Hidenaga Kawasumi, Takahisa Gono, Yasushi Kawaguchi, et al. Recent Treatment of Interstitial Lung Disease with Idiopathic Inflammatory Myopathies. Pulmonary Med 2015:9: 9-17.
Sato S, Murakami A, Kuwajima A et al. Clinical utility of an enzyme-linked immunosorbent assay for detecting antimelanoma diferentiation-associated gene 5 autoantibodies. PLoS ONE 2016;11:e0154285.
Richard D Sontheimer. MDA5 autoantibody-another indicator of clinical diversity in dermatomyositis. AnnTranslMed 2017;5:160.
Kinoko Irie, Natsuko Matsumura, Michiko Hoshi, et al. Inverse Gottron's papules in patients with dermatomyositis: an underrecognized but important sign for interstitial lung disease. Int J Dermatol 2021;60:e37-79.
Karger AG, Basel Anti-MDA5 Antibody-Positive Dermatomyositis Presenting with Cellulitis-Like Erythema on the Mandible as an Initial Symptom. Case Rep Dermatol 2018;10:110-114.

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