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It hasn't been stated the configuration of the T wave abnormality. It can be a tall T wave and the cause includes hyperkalaemia (too much potassium in the blood), hyperacute myocardial infarction (heart attack...heart muscle damage) and left bundle branch block (causes arrhythmia). Usually requires other abnormal wave forms in addition to the t wave abnormality.
Causes of small, flattened or inverted T waves are numerous and include ISCHEMIA (blocked or partially blocked arteries), age, race, hyperventilation, anxiety, drinking iced water, LVH, drugs (e.g. digoxin), pericarditis, PE, intraventricular conduction delay (e.g. RBBB)and electrolyte disturbance.
Abnormal T waves has many causes and your post indicates ischemia as the cause. Any EKG test requires other evidence to make a diagnosis.