T wave = electrical recovery
and relaxation of ventricles. A heart attack (myocardial infarction or
MI) can be recognized by an elevation in the S-T segment of the
ECG. Thus, one type of MI is an S-T elevation MI or STEMI.
addition notes :
What does inverted T mean in ECG?
[4] Wellen syndrome is symmetrically inverted T waves in anterior precordial leads; these T waves suggest a severe narrowing of the left anterior descendent coronary artery at a proximal location. Recognition of this condition is vital to prevent a large anterior STEMI.