Yang Q, Kiyoshige K, Fujimoto T, Katayama M, Fujino K, Saito K, Nakaya Y, Mori H
Second Department of Internal Medicine, University of Tokushima School of Medicine, Japan.
Clin Cardiol. 1989 May;12(5):277-82. doi: 10.1002/clc.4960120510.
The U loop of the vectorcardiogram was examined qualitatively and quantitatively in 100 normal subjects and 67 patients with old myocardial infarction, using a direct-writing vectorcardiograph with memory function. In the control group, the U loop was directed to the left, anteriorly and inferiorly, and it was inscribed counterclockwise in the horizontal plane. In patients with anterior myocardial infarction, the U loop tended to be displaced to the right, and in patients with inferior myocardial infarction to the right and superiorly. The shape of the U loop in patients was also different from that of normal subjects. The maximum U vector was significantly smaller in magnitude both in patients with anterior and inferior myocardial infarction than that of normal subjects (p less than 0.01). In patients with ventricular aneurysm, the magnitude of the maximum U vector was significantly smaller and its direction was displaced more to the right and posteriorly than those without aneurysm (p less than 0.01). In standard 12-lead electrocardiogram (ECG), observation of the U wave in patients with old myocardial infarction was difficult, especially in the limb lead, because of the small size of the U wave. Therefore, vectorcardiographic observation may be more useful than electrocardiographic observation for the analysis of the U wave in patients with old myocardial infarction.
使用具有记忆功能的直描式心电向量图仪，对100名正常受试者和67例陈旧性心肌梗死患者的心电向量图U环进行了定性和定量检查。在对照组中，U环指向左、前下方，在水平面呈逆时针方向运行。前壁心肌梗死患者的U环倾向于向右移位，下壁心肌梗死患者的U环则向右上移位。患者U环的形态也与正常受试者不同。前壁和下壁心肌梗死患者的最大U向量幅值均显著小于正常受试者（p<0.01）。室壁瘤患者的最大U向量幅值显著更小，其方向比无室壁瘤患者更向右后方移位（p<0.01）。在标准12导联心电图（ECG）中，由于陈旧性心肌梗死患者U波较小，尤其是在肢体导联，观察U波较为困难。因此，对于陈旧性心肌梗死患者U波的分析，心电向量图观察可能比心电图观察更有用。
