This document provides an introduction to code blue situations in a hospital setting. It discusses the purpose of code blue response teams, which are groups composed of doctors and nurses trained to respond to cardiac or respiratory arrests. The document outlines the roles and responsibilities of code blue team members. It also reviews the primary and secondary survey process for assessing and treating patients experiencing code blue emergencies, following the ABC (airway, breathing, circulation) approach. Finally, it examines the treatment algorithms for different cardiac arrest rhythms like ventricular fibrillation and asystole.