Here is some more terminology. When there is not only anterior ST segment elevation (V3 and V4), but also septal (V1 and V2) and lateral (V5, V6, lead I and lead aVL), an “extensive anterior ...

This means 1 millimeter in any two contiguous leads, except leads V2 or V3, where the elevation ... On rare occasions, persistent ST segment elevation may be seen in V1 and/or V2, indicating ...