On this month's ECG Cases, Dr. Jesse McLaren explains how STEMI criteria can be false positive with large scale QRS and proportional ST elevation, or false negative with low/normal scale QRS and disproportionate ST elevation and hyperacute T waves, and that rules for subtle occlusion using proportionality can help differentiate LBBB with or without Occlusion MI, or LV aneurysm vs anterior STEMI with Q waves... Please consider a donation to EM Cases to ensure continued Free Open Access Medical Education here: https://emergencymedicinecases.com/donation/