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心向量图与心电图虽然在原理上有许多相同之处,但由于仪器的性能和描记方法不同,所以二者各有优缺点不能相互替代,只能互补短长。自从1938年心向量图应用于临床以来,一般认为,心向量图较心电图有以下的优点:1.对某些陈旧性心肌梗塞的诊断和定位,有时可以比心电图为可靠。如下壁心肌梗塞在心电图上仅可表示电轴左偏,Ⅱ、Ⅲ导联呈rsR′s′波的错折,aVF呈错综波,但心向量图却能显示出特征性的改变。2.左心室肥厚,特别是左室收缩期负荷,一般有QRS:T 的比值增大及QRS—T 夹角增大等改变,故而用心向量图来诊断,标准较易掌握。3.右心室肥厚,在心电图上有时不易与右束枝传导阻滞相鉴别,但心向量图却可以明确诊断。4.心室内传导阻滞,尤其是完全性左束枝传导阻滞或心肌梗塞与预激症侯群的鉴别诊断,有一定意义。
Although there are many similarities between the principle vector chart and the electrocardiogram in the principle, the advantages and disadvantages of the two instruments can not be replaced by each other due to the different performance and description methods of the instrument. Since the application of the cardiac vector chart in 1938 to the clinic, it is generally believed that the cardiac vector chart has the following advantages over the electrocardiogram: 1. The diagnosis and localization of some of the old myocardial infarctions can sometimes be more reliable than the electrocardiogram. Myocardial infarction in the next wall can only be expressed on the left electrocardiogram axis deviation, Ⅱ, Ⅲ lead was rsR’s’ wave wrong turn, aVF was erratic, but the cardiac vector diagram can show a characteristic change. 2. Left ventricular hypertrophy, especially left ventricular systolic load, the general increase in QRS: T ratio and QRS-T angle increases and other changes, so the heart vector diagram to diagnose, the standard easier to grasp. 3. Right ventricular hypertrophy, sometimes difficult to distinguish with the right bundle branch block in the ECG, but the cardiac vector diagram can be a clear diagnosis. 4. Ventricular conduction block, especially the complete left bundle branch block or myocardial infarction and the prognosis of the forefront of the differential diagnosis of the group, a certain significance.