不稳定型心绞痛

尽管存在不典型症状，但胸痛和（或）呼吸困难仍为最常见的症状。

初始危险分层和管理依赖临床特征和心电图。

典型心电图表现为 ST 段压低和 T 波倒置，但也可正常。

紧急处理包括抗血小板和抗栓治疗，以减少心肌损伤范围和并发症

长期管理包括降低危险因素和药物治疗预防再发

不稳定型心绞痛 (unstable angina, UA) 是一种急性冠脉综合征，无心肌损伤的生化证据。[1]Roffi M, Patrono C, Collet JP, et al. 2015 ESC guidelines for the management of acute coronary syndromes in patients presenting without persistent ST-segment elevation: Task Force for the Management of Acute Coronary Syndromes in Patients Presenting without Persistent ST-Segment Elevation of the European Society of Cardiology (ESC). Eur Heart J. 2016 Jan 14;37(3):267-315. http://eurheartj.oxfordjournals.org/content/37/3/267.long http://www.ncbi.nlm.nih.gov/pubmed/26320110?tool=bestpractice.com 特征性临床表现为休息时心绞痛持续较长（>20 分钟）；新发严重心绞痛；心绞痛发作频率增加、持续时间延长或发作阈值降低；或心绞痛发生在近期心肌梗死发作后。[1]Roffi M, Patrono C, Collet JP, et al. 2015 ESC guidelines for the management of acute coronary syndromes in patients presenting without persistent ST-segment elevation: Task Force for the Management of Acute Coronary Syndromes in Patients Presenting without Persistent ST-Segment Elevation of the European Society of Cardiology (ESC). Eur Heart J. 2016 Jan 14;37(3):267-315. http://eurheartj.oxfordjournals.org/content/37/3/267.long http://www.ncbi.nlm.nih.gov/pubmed/26320110?tool=bestpractice.com