STEMI and Equivalents

Question 1

Inferior MI accounts for _____% of all AMIs.

Answer 1

50%

Question 2

List the ST elevation and reciprocal changes seen in inferior MI.

Answer 2

• STE in II, III, aVF
• STD in aVL

Question 3

What are the possible culprit arteries involved in inferior STEMI?

Answer 3

1. 80% = RCA
2. 20% = LCx

Rarely, a wraparound LAD can supply the inferior wall, presenting concomitant anterior and inferior STE.

Question 4

RCA occlusion in inferior STEMI is suggested by…? (3)

Answer 4

STE lead III> lead II
ST depression in lead I
Signs of RVMI = STE in V1 and V4R

Question 5

Circumflex occlusion in inferior STEMI is suggested by…?

Answer 5

STE in lead II = lead III
No STD in lead I
STE in lateral leads I, aVL, V5, V6