After transient pacemaker stimulation, transient left bundle branch block, and paroxysmal atrial fibrillation with fast ventricular rate, once the patient is back in his/her normal rhythm there can be ECG signs of ischemia (T wave inversion). These ECG changes are called "memory of the heart". They do not correspond with coronary lesions and are reversible after hours or days. Nevertheless, obviously when you see T wave inversion in a patient, the first thing you have to consider is true myocardial ischemia.
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