缺血性心脏病一般系指冠状动脉粥样硬化性心脏病(冠心病),在临床心电图上常指心肌梗塞及冠状动脉功能不全,如心绞痛及慢性冠状动脉供血不足等改变。由于冠心病临床症状出现之前,常先有心肌的电学改变,所以本文拟从心电向量图的改变,对照临床及心电图改变,说明其对早期 Ischemic heart disease generally refers to coronary heart disease (coronary heart disease), often referred to in clinical ECG myocardial infarction and coronary insufficiency, such as angina and chronic coronary insufficiency and other changes. Since the clinical symptoms of coronary heart disease before, often the first myocardial electrical changes, so this article from the change of ECG vector diagram, control of clinical and ECG changes, indicating its early