This document provides an introduction to electrocardiograms (ECGs) and EKG monitoring. It discusses ECG basics like standardized methods and devices, the components and measurements of the ECG complex, and how to analyze ECGs. The objectives are to learn how to properly apply ECG leads, define what a lead is, learn the anatomy of a normal ECG, define normal sinus rhythm, and quantify the various components of a normal ECG. Various cardiac rhythms and abnormalities are also explained such as sinus bradycardia, sinus tachycardia, atrial fibrillation, ventricular fibrillation, and myocardial infarction.