This document outlines the objectives and modules of an ECG rhythm interpretation course. It begins by defining normal sinus rhythm as the normal heart rhythm originating from the sinoatrial node and conducted through the normal pathway. It then describes potential problems that can cause arrhythmias in the sinoatrial node, atrial cells, atrioventricular junction, or ventricular cells, such as firing too slowly, too quickly, occasionally, continuously, or through reentrant pathways. Common arrhythmias that may result from these problems include sinus bradycardia, sinus tachycardia, premature atrial contractions, atrial flutter, atrial fibrillation, AV junctional blocks, premature ventricular contractions, ventricular tachycardia,