Therefore the classic finding with angina is subendocardial ischemia, meaning less oxygen is reaching the region just under the endocardium.

因此心绞痛的典型发现就是心内膜下层缺血，即到达心内膜下层的氧减少。

Unstable angina, for the same reason as stable angina, involves subendocardial ischemia and it should be treated as an emergency, because patients are at a high risk of progressing to myocardial infarction, or heart attack.

不稳定型心绞痛，和稳定型心绞痛病因一样，因心内膜下层缺血，应按急症救治，因为患者高发心肌梗死或心脏病。