Disaster medicine.

The American College of Emergency Physicians defines a medical disaster as occurring when the destructive effects of natural or man-made forces overwhelm the ability of a particular region to meet the demand for health care. The science of disaster medicine is continually improving, and significant progress has been made in defining how to provide a comprehensive response to disaster sites. The management of a disaster involves an activation phase, followed by the implementation and recovery phases. The success of each phase depends on coordinated on-site and off-site communication systems. This paper presents an overview of this new subspecialty and discusses the fundamental components of an effective disaster response.