What the 12-Lead ECG Is Really Telling You (About Coronary Artery Occlusion) Reading a 12-lead ECG isn’t just about spotting ST elevation, it’s about diagnosing which part of the heart is starving and which artery is responsible. When you know the vascular anatomy, you’re not just reading squiggly lines… you’re predicting the enemy's location. Let’s break it down in plain English 👇 Each Lead Tells a Story The 12-lead gives you a window into different walls of the heart, and each wall is fed by