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” MI is said to be present.

If there is an R wave in V1 or V2, the term PRWP can be used, but not an old anterior wall myocardial infarction. On rare occasions, persistent ST elevation may be seen in V1 and/or V2 indicating ...