Emergency medicine involves the care of patients who require immediate medical attention. The specialty encompasses a broad range of medical disciplines, including anaesthesia, cardiology (a field related to the heart), neurology (a field related to the brain), plastic surgery, orthopaedic surgery (surgery relating to the bones or muscles), and cardiothoracic surgery (surgery relating to the heart, chest, or lungs). There are also a number of subspecialties including extreme environment medicine, disaster medicine and sports medicine. Related to emergency medicine is the specialty of critical care medicine, which is concerned with the care of patients with life-threatening conditions often treated in intensive care settings....