Electrical Breadcrumbs

ECGs aren’t really about memorizing squiggly lines—they’re about following electricity. In this episode of The Ten Minute Medic, we trace the heart’s electrical breadcrumbs from the SA node through the atria, AV node, His-Purkinje system, ventricles, and repolarization. You’ll learn why P waves, PR intervals, QRS complexes, and T waves look the way they do—and why a wide QRS should make you ask a physiologic question rather than simply recognize a pattern. The goal is simple: stop thinking pattern → name and start thinking electricity → physiology → pattern → diagnosis. Because great ECG interpretation isn’t about having a better memory. It’s about understanding the electrical story the heart is trying to tell you. Cardiac Conduction System Study Guide