中国医学科学院心血管病研究所阜外医院编写的《临床心电向量图图谱》(人民卫生出版社,1986:429)一书在左中隔支传导阻滞的诊断标准中,提到了上横面 QRS 环最大向量>45°种最大前向力>最大左向力两条。笔者认为,这两条诊断标准在临床应用上所得出的结论是完全相同的。从理论上讲,它们是一个锐角和两条直角边的关系,也就是说它们是同一个概念的两种说法。如果在一个直角三角形中,一个角大于45°时。那么,这个角所对虚的直角边一定大于 Chinese Academy of Medical Sciences Cardiovascular Institute Fuwai Hospital prepared “clinical ECG vector map” (People’s Health Publishing House, 1986: 429) in the diagnosis of left middle septal block in the diagnostic criteria, referred to the horizontal Surface QRS ring maximum vector> 45 ° kinds of maximum forward force> two maximum left force. The author believes that these two diagnostic criteria in clinical application of the conclusion reached is exactly the same. In theory, they are an acute angle and the relationship between two right-angled edges, that is to say they are two versions of the same concept. If in a right triangle, when one angle is greater than 45 °. Well, this corner of the imaginary right-angle side must be greater than