The key distinction is that unstable angina means that the heart tissue is alive but ischemic or starving for oxygen, whereas myocardial infarction means that the areas of heart tissue have already begun to necrose or die.

两者最重要的差别是不稳定型心绞痛心脏组织是活的，但缺血/缺氧；而心肌梗死意味着该区域心组织已发生坏死。