Dx acute inferior MI

• ST elevation in II, III, aVF seen in this ECG

• ECG changes in Acute MI is characterized by

1. Sequential changes – ST elevation followed by T inversion and new Q wave formation
2. Regional depending on artery occluded e.g.

• II, III, aVF in inferior MI due to occlusion of right coronary artery (may be associated with RV infarct which will be discussed in next sessions)
• V1-V3 in anteroseptal MI and V2-V5 in anterior MI due to occlusion of left anterior descending artery (LAD)
• V4-V6, I, aVL in anterolateral MI due to occlusion of proximal LAD or combined occlusion of LAD with left circumflex artery (LCX)
• I, aVL in lateral MI due to occlusion of LCX

3. Reciprocal changes – reciprocal ST depression seen in opposite leads e.g. ST depression in I, aVL and chest leads in this inferior MI ECG; 

There can be reciprocal ST depression in II, III, aVF in case of anterolateral MI.