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目前应用较广泛并在理论和实践上得到充分研究的心电图和心电向量图尚有不足之处。例如,单极胸前导联对心脏局部变化虽有很高的评价,但由于电极数较少,尤其右胸及背部没有电极,是否能充分反映心脏电活动现象是有疑问的。Frank导联是把心脏电活动假定为单一的定位的偶极子而设计的,对心肌局部电变化的反映也不一定敏
Currently more widely used in theory and practice have been fully studied the ECG and ECG vector graph there are deficiencies. For example, although the monopolar thoracic apex leads to a high degree of local changes in the heart, it is questionable whether the electrical activity of the heart can be adequately reflected due to the small number of electrodes, especially the absence of electrodes on the right chest and the back. The Frank lead is designed to assume electrical activity in the heart as a single, localized dipole, and is not necessarily sensitive to local changes in the myocardium