Warning: This is an over simplified post.
If you are the kind who has a tough time remembering changes in "which lead" correlates with the "where" the heart is injured, this post is for you xD
Elevation of ST segment indicates zone of injury, diagnosis is supported by reciprocal changes, ST segment depression in the leads facing the opposite wall.
For precordial leads, I use the "SAL" mnemonic.
To be more complete about the lateral wall involvement, I use the "SALLI" mnemonic.
L for aVL and I for lead I.
So for lateral wall MI: V5 , V6, aVL and lead I.
For inferior MI, I remember the word "INF" and the horizontal lines in them.
So for inferior wall MI: II , III and aVF.
|Inferior wall MI mnemonic|
By the end of this post, you should be able to draw this cheat sheet yourself: