Experience and history have taught us that much can be done for the sick and injured before such patients reach the hospital. From the legacy of the Good Samaritan to the modern day organization of emergency medical services, the immediate care of those stricken has undergone significant change in both philosophy and practice. While many prehospital care organizations with roots established deeply in the past still flourish, modern emergency care, in the new world at least, has developed rapidly only over the past ten years.

In the United States, a concerted effort to improve the care of the wounded during the Civil War led to the introduction of the “flying ambulances” used earlier by Napoleon's Chief Surgeon, Larrey. Americans made significant contributions to acute care with the work of such noted men as Crile, with his form of external pneumatic counterpressure; Kouwenhoven, Knickerbocker and Jude at lohns Hopkins; Beck and the first reported defibrillation in a patient; Safar and his co-workers with the rediscovery of mouth-to-mouth; and many others.