
羅格斯大學紐澤西醫學院研究團隊回顧數十年病例指出,罕見的「紅色月牙」曾與多種嚴重疾病同時出現。
美國羅格斯大學紐澤西醫學院研究團隊回顧自1954年以來的病例指出,罕見的「紅色月牙」指甲變化曾與心臟衰竭、肝硬化及類風濕性關節炎等全身性疾病同時出現,但確切成因仍待釐清。
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罕見的「紅色月牙」曾與心臟衰竭、肝硬化及類風濕性關節炎等疾病同時出現,相關異常自1954年起即有醫學病例記錄。
圖為紅色月牙(red lunula),指甲根部可見明顯泛紅區域;相關異常自1954年起即有醫學病例記錄。
平常大多呈現白色的指甲「月牙」,如果出現紅色變化,可能與身體內部疾病有關。美國羅格斯大學紐澤西醫學院(Rutgers New Jersey Medical School)研究團隊回顧數十年病例指出,罕見的「紅色月牙」(red lunula)曾與心臟衰竭、肝硬化及類風濕性關節炎等疾病同時出現。
科學新聞網站《Science Alert》報導,這項研究刊登於《美國醫學科學期刊》(The American Journal of the Medical Sciences),屬於病例文獻回顧。研究團隊整理自1954年以來的相關病例,發現紅色月牙曾與心血管、肝臟、血液、皮膚及風濕免疫疾病相關,但目前仍無法確定這種指甲變色的確切成因。
月牙是指甲根部生長區域露出的部分,通常大拇指最明顯。過去病例顯示,紅色月牙除了出現在心臟衰竭、肝硬化及類風濕性關節炎患者身上,也曾見於全身性紅斑性狼瘡、圓形禿及一氧化碳中毒案例。
多根指甲較值得注意 單一指甲先排除局部病變
研究團隊指出,如果紅色月牙出現在多根指甲,而非單一指甲,較可能與全身性疾病有關;若只有單一指甲出現紅色,則應先排除指甲床感染、甲下出血或甲下腫瘤等局部問題。
研究也提到,紅色月牙可能與指甲下微血管擴張、血流增加有關。醫師在臨床檢查時按壓紅色月牙,若顏色暫時變白,可能支持微血管擴張的判斷,但這只是醫師檢查的一部分,不能作為民眾自行診斷疾病的依據。

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