Even after it became an accepted treatment for angina, the technical term for chest pain, what exactly nitroglycerine does to the circulatory system remained a mystery for a long time.

即使在它成为心绞（胸技术术语）公认治疗方法之后。硝酸甘油究竟对循环系统有什么作用，长期以是个谜。

Other heart conditions that might lead to stable angina are ones that cause a thickened heart muscle wall, which would require more oxygen.

其余可能造成稳定型心绞心脏问题有心肌肥厚等：肥厚心肌需要更多氧气。

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

因此心绞典型发现就是心内膜下层缺血，即到达心内膜下层氧减少。

Alright, so if we line these three up side-to-side, there's some important clinical similarities and differences.

好，如果我们对比这3种类型心绞，就会发现些重要临床相似点和不同点。

Stable angina or chronic angina is the most common type of angina and it usually happens when the patient has greater than or equal to 70% stenosis, meaning 70% of the artery is blocked by plaque buildup.

稳定型心绞/慢性心绞是最常见心绞类型，通常发生于病人有>=70%狭窄时，即动脉管腔被形成斑块阻塞70%。

In the majority of cases, the underlying cause of stable angina is atherosclerosis of one or more the coronary arteries—arteries supplying blood to the heart muscles.

大多数情况下，稳定型心绞根本原因是至多个冠状动脉（供应心肌动脉）发生粥样硬化。

Even after it became an accepted treatment for angina, the technical term for chest pain.

即使在它成为心绞公认治疗方法之后，心绞是胸专业术语。