这就是顽固性心绞痛，严重度用级别来表示。

This is called intractable angina, the severity of which is designated by classes.

youdao

目的观察硬膜外自控镇痛(PCEA)治疗顽固性心绞痛的效果。

Objective to observe the effects of PCEA in the treatment of intractable angina pectoris.

youdao

观察经皮激光打孔心肌血运重建术治疗顽固性心绞痛的临床疗效。

Objective to observe the clinical efficacy of percutaneous laser myocardial revascularization (PLMR) on the treatment of angina pectoris.

youdao