Paramedic units have awakened a new concept in prehospital care in the USA. New emergency medical services (EMS) administrations, better educated personnel, and mass public awareness through media events have all contributed to the change.

Operational changes designed to tighten control of the emergency medical technician (EMT) and paramedic came about through deployment of ambulances and categorization and designation of emergency hospitals. Clinical changes have given the EMS responder, particularly the paramedic, a great deal of freedom in the care given to patients. The paramedic, who uses subjective criteria, can administer care ranging from Standard First Aid to advanced cardiology. Subjective control should be rigid for the EMT or paramedic, when cognitive abilities include only knowledge, comprehension and application, but not for those who have had a chance to exercise analytic and synthetic skills in pre-hospital training programs.