心臟毒性
心臟毒性(英語:cardiotoxicity)是指因電生理受損或心肌損傷而導致的心臟功能障礙,進而引發心臟毒性反應,[1]而可能導致心臟衰竭、心律不整、心肌炎及心肌損傷,[2]造成心臟功能虛弱,使其泵血效率下降。雖然部分影響為可逆,但其他損害則可能會造成永久性損傷,且需要進一步治療。
心臟毒性可能由化學療法(常見範例為蒽環類藥物)[3][4]治療及/或放射治療所引起,[5]亦可能源於神經性厭食症的併發症、攝入重金屬的副作用、[6]長期濫用或高劑量服用特定強效興奮劑(例如古柯鹼),[7]或是藥物施用不當(例如使用布比卡因 - 局部麻藥 - 不當而發生全身毒性反應)所致。[8]
機制
[编辑]目前有許多機制可用於解釋心臟毒性。雖然不同病因往往具有相同的致病途徑,整體而言,主要機制仍取決於誘導心臟損傷的特定因子。例如,其核心機制被認為是心肌細胞的氧化壓力。[8]當活性氧(ROS)壓倒心臟細胞的抗氧化防禦系統時,就會造成直接的細胞損傷。這種氧化損傷會破壞粒線體功能,進而干擾心肌本身的能量產生,導致三磷酸腺苷(ATP)耗竭而引發能量匱乏,最終透過細胞凋亡或細胞壞死,促進細胞死亡。[9]
心臟毒性的其他機制還包括發炎反應、[10]DNA受損以及細胞信號傳導受阻。其中,DNA受損與細胞信號傳導受阻,已被提出作為許多具心臟毒性之化學療法藥物的作用機制。[11]
不論其確切機制為何,臨床表現皆包括可能造成永久性傷害的心臟衰竭、心律不整、心肌炎及心肌損傷。[2]這些疾病會大幅提高患者的死亡率與發病率,因此對於暴露於心臟毒性因子的患者,有絕對必要進行嚴密的臨床監測。
誘發因子
[编辑]誘發因子的清單非常龐大,涉及各種類別的藥物以及環境因子。這些心臟毒性物質所產生的影響各不相同,並非完全一致。
化學治療藥物
[编辑]來源:[12]
其他藥物
[编辑]環境毒素
[编辑]濫用物質
[编辑]來源:[17]
其他
[编辑]這些因子可能會導致不同程度的心臟毒性,其影響可能具有劑量依賴性,並受到個體因素的干擾,例如既有的心血管疾病與遺傳易感性,這些因素可能會對任何心臟損傷產生更高的敏感性。
治療
[编辑]最可能有效的治療方法是儘快停止接觸誘發因子,不論該因子是藥物,或是環境因子。雖然有些人能從暴露引起的心臟毒性中完全康復,但許多人會留下永久性損害,而需進一步管理。具體的管理方式取決於所受到的損害,但通常遵循各類疾病的臨床指引,例如心臟衰竭、心律不整和心肌炎。[20]
為防止廣泛的心臟損傷,服用蒽環類藥物的患者可併用右雷佐生,將其作為預防性的心臟保護劑。[21]
參見
[编辑]引用
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