The medical specialty that deals with the care of patients suffering from injuries or illnesses that require immediate medical attention is known as emergency medicine. It is also referred to as accident and emergency medicine. The field is concerned with immediate recognition, care, examination and stabilization of patients in the phase of acute injury and illness. Critical care, hyperbaric medicine, disaster medicine, sports medicine, ultrasonography and aerospace medicine are some of the sub-fields of this discipline. Critical care refers to the identification and management of patients that are at risk of or are recovering from life-threatening conditions. It involves the study of some crucial aspects like invasive monitoring techniques, life support, resuscitation and end-of-life care. Emergency medicine is an upcoming field of medicine that has undergone rapid development over the past few decades. The book studies, analyses and upholds the pillars of this discipline and its utmost significance in modern times. As this field is emerging at a rapid pace, the contents of this book will help the readers understand the modern concepts and applications of the subject.