EKG
Usually presents as an Anterior MI with ST changes in anterior Precordial leads (V1-V3)
Basic labs, including troponin
Echocardiography
Usually presents as an Anterior MI with ST changes in anterior Precordial leads (V1-V3)
EKG usually shows an Anterior MI with ST changes in anterior Precordial leads (V1-V3)
Troponin may be elevated
Definitive diagnosis made at time of<unk>  angiography
Coronary artery dissection
Cardiac
Left ventricular pseudoaneurysm
ST-segment elevation myocardial infarction 
Missile embolus
Post-MI 
Myocardial rupture
Previous MI with recurrent ischemia in same area