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Cohn提出无症状性心肌缺血(SMI)的定义是:不作随心绞痛及有关症状的一过性血流分布异常,导致心肌功能及电生理异常。可分为以下三型:①既往无心肌梗塞及心绞痛的SMI;②心肌梗塞后的SMI;③心绞痛者的SMI(既有心绞痛发作又有SMI发作)。潘生丁负荷心肌扫描法有助于SMI的早期诊断,~(18)F-FDG及~(13)NH_3CT并可检出心肌代谢的异常。另外由于冠脉血流异常为保存心肌活力,室壁运动减低的所谓“心肌冬眠”也被列为广义的SMI。多巴酚丁胺负荷试验及舌下含硝酸甘油时室壁运动幅度降低及左室射血分数改善,应用超声心动图及心血池扫描可以测知。心肌缺血的过程,首先是脉状血流异常,继而发
Cohn proposed asymptomatic myocardial ischemia (SMI) is defined as: abnormal blood flow distribution without angina pectoris and related symptoms, leading to myocardial dysfunction and electrophysiology. Can be divided into the following three types: ① previous non-myocardial infarction and angina in the SMI; ② SMI after myocardial infarction; ③ angina of SMI (both angina attack and SMI attack). Dipyridamole-loaded myocardial scan is helpful for the early diagnosis of SMI, ~ (18) F-FDG and ~ (13) NH_3CT and can detect myocardial metabolic abnormalities. In addition, due to abnormal coronary blood flow to preserve myocardial viability, reduced wall motion so-called “myocardial hibernation” is also classified as a generalized SMI. Dobutamine stress test and sublingual nitroglycerin decreased wall motion amplitude and left ventricular ejection fraction improved, the application of echocardiography and blood pool scan can be measured. The process of myocardial ischemia, first of all, abnormal blood flow, and then made