During ventricular repolarization, the T wave on an electrocardiogram (ECG) typically deflects upward in most leads. This upward deflection indicates that the ventricles are returning to their resting state after contraction. However, the direction of the T wave can vary depending on the lead being analyzed and the heart's electrical activity. In some cases, it may deflect downward, especially in leads that are oriented differently relative to the heart's electrical axis.
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