Electrotonic Modulation of Ventricular Repolarization and Cardiac Memory

It is a well-known and widely accepted fact that T wave changes are either primary or secondary in nature [1,2] and that this simple classification covers all T wave abnormalities occurring in the human ECG[3]. Secondary T wave changes are those provoked by variations of the QRS, whereas primary T wave changes occur as independent phenomena. The latter are considered to imply a change of the ventricular gradient (VG), while the former are not [2–4].

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