Tessa Davis. Myocardial infarction/ischaemia, Don't Forget the Bubbles, 2014. Available at:
Time dependent changes. The location of the infarction can be localised according to the affected leads.
Horizontal depression of the ST segment with an upright T wave is usually a sign of ischaemia rather than infarction. In the absence of an infarction, the ECG will return to normal with the resolution of angina.