Evolution of Acute STEMI
In order to diagnose a STEMI, one must first be able to identify the ST segment on the EKG. The ST segment is isoelectric and represents the interval between ventricular repolarization and depolarization.
A good mnemonic to remember all the causes of ST segment elevation on the ECG is “ELEVATION.”
Electrolyte abnormalities
Left bundle branch block
Aneurysm of left ventricle
Ventricular hypertrophy
Arrhythmia disease (Brugada syndrome, ventricular tachycardia)
Takotsubo/Treatment (iatrogenic pericarditis)
Injury (MI or cardiac contusion)
Osborne waves (hypothermia or hypocalcemia)
Non-atherosclerotic (vasospasm or Prinzmetal’s angina)