Inferior MI is characterized by presence of ST-elevation in inferior leads (II, III and aVF) and may result from occlusion RCA, LCX and less commonly LAD.

RCA occlusion (80%) is suggested by:
ST elevation in lead III > lead II
Presence of reciprocal ST depression in lead I
Signs of right ventricular infarction: STE in V1 and V4R

Circumflex occlusion (18%) is suggested by:
ST elevation in lead II >= lead III
Absence of reciprocal ST depression in lead I
Signs of lateral infarction: ST elevation in the lateral leads I and aVL or V5-6

LAD occlusion (2%) is suggested by:
simultaneous ST elevation in the precordial and inferior leads