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About the incorrect description of ventricular repolarization order: discussion on ventricular depolarization and repolarization process, and direction consistency mechanism of QRS-T |
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Abstract In traditional opinion, the direction consistency of QRST is resulted from the fact that the location depolarized first is repolarized after. It confuses the concepts of depolarization and repolarization, in which 3 phases are mistakenly regarded as the whole of repolarization, 2 phases are taken as the continuation of depolarization, and the variation of repolarization process is attributed to external causes without noticing the huge difference of electrophysiologic features in ventricular myocytes. Actually, where is depolarized first is necessarily repolarized first, but where is depolarized after is repolarized faster and finishes earlier, which makes membrane potential gradient of the whole ventricle points to outer membrane. Therefore, the vectors of QRS and T orient to almost the same direction.
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