ECG changes of the ST segments and the T waves. Changes can be primary, secondary or nonspecific. Primary ST and T changes are strictly due to a problem with ventricular repolarization, whereas secondary ST and T changes occur when a problem in ventricular depolarization causes a problem with repolarization. Nonspecific changes are ST and T wave changes that do not meet strict criteria of a known disorder.


•See primary ST and T changes; secondary ST and T changes; Nonspecific ST and T changes.

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