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

These findings occur in progressive stages, all of which are seen in about 50% of cases of pericarditis. Stage I (acute phase): Diffuse concave upward ST segment elevation in most leads ...