Toyama S, Suzuki K
Jpn Heart J. 1976 May;17(3):302-14. doi: 10.1536/ihj.17.302.
For confirming the configuration of the QRS loop in left anterior hemiblock, 82 cases with the frontal QRS vector above minus 30 degrees were collected and classified by the configuration of the horizontal QRS loop. Thereafter, a comparison has been made between the configuration of the QRS loop in clinical cases and that in the authors' construction method, and the following findings for criteria of left anterior hemiblock are obtained. 1) The afferent limb of the frontal QRS loop is dislocated to the left and more superiorly. 2) The efferent and afferent limbs of the horizontal QRS loop are located left posteriorly. The configuration of the horizontal QRS loop is long and narrow and the direction of inscription is clockwise, a figure of 8 or counterclockwise. 3) Cases with the right posterosuperior dislocation of the afferent limb of the QRS loop is excluded from left anterior hemiblock.
为了确定左前分支阻滞时QRS环的形态，收集了82例额面QRS向量大于-30度的病例，并根据横面QRS环的形态进行分类。此后，对临床病例中的QRS环形态与作者构建方法中的形态进行了比较，得出了以下左前分支阻滞的诊断标准：1）额面QRS环的起始向量向左上方移位。2）横面QRS环的终末向量和起始向量位于左后方。横面QRS环形态狭长，运行方向为顺时针、“8”字形或逆时针。3）QRS环起始向量向右后上方移位的病例不属于左前分支阻滞。
