operation for ischemic cerebrovascular diseases

例句：

1. 1. The patient had a history of ischemic heart disease.
   这位病人有缺血性心脏病的历史。
2. 2. The ischemic tissue was necrotic and swollen.
   缺血的组织是坏死和肿胀的。
3. 3. The doctors performed an emergency coronary bypass surgery to save the patient's life.
   医生们进行了紧急冠状动脉搭桥手术，以挽救患者的生命。