The<unk>  <unk> , sometimes termed the emergency room (ER), emergency ward (EW), accident & emergency (A&E)<unk>  or casualty<unk>  is a hospital or primary care<unk>  that provides initial treatment to patients with a broad spectrum of illnesses and injuries, some of which may be life-threatening and requiring immediate attention.<unk> s developed during the 20th century in response to an increased need for rapid assessment and management of critical illnesses. In some countries,<unk> s have become important entry points for those without other means of access to medical care.
Upon arrival in the<unk> , people typically undergo a brief triage, or sorting, interview to help determine the nature and severity of their illness. Individuals with serious illnesses are then seen by a physician more rapidly than those with less severe symptoms or injuries. After initial assessment and treatment, patients are either admitted to the hospital, stabilized and transferred to another hospital for various reasons, or discharged. The staff in<unk> s not only includes doctors, but physician assistants (PAs) and nurses with specialized training in emergency medicine and in house emergency medical technicians,respiratory therapists, radiology technicians, Healthcare Assistants (HCAs), volunteers, and other support staff who all work as a team to treat emergency patients and provide support to anxious family members. The<unk> s of most hospitals operate around the clock, although staffing levels are usually much lower at night. Since a diagnosis must be made by an attending physician, the patient is initially assigned a chief complaint rather than a diagnosis. This is usually a symptom: headache, nausea, loss of consciousness.  The chief complaint remains a primary fact until the attending physician makes a diagnosis.
Emergency department
Emergency medicine
Hospital
Chest
Critical care nursing
Bleb 
Anesthesiologist
Coronary care unit