Forum Asst. Chief
I wouldn't call a STEMI by way of a 2 lead reading. Almost guarantee it is one, but you really should have a 12 lead.
Actually II and III are continuous leads right? I guess technically you shouldn't need the other leads - with a good chest pain story you can probably still call it. We still want the 12 lead, but I don't know that it's strictly necessary for the purposes of calling this a STEMI.
...Well, I guess we need to see reciprocal changes as well. So yeah, more leads.