Page 7, Electrocardiography, Dr. D. Penney

The ECG (continued...)

Whereas depolarization moves from endocardium to epicardium (due to the endocardial location of the conducting fibers) (Table 12) with cells changing from negative inside to positive inside, repolarization moves from epicardium to endocardium with cells changing back to being negative inside. Thus, the resulting vector for ventricular repolarization points away from the heart wall, at about (+) 40-50 degrees, that is, in nearly the same direction as that of ventricular depolarization. This is why the normal T wave is upright in most leads.

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