Mass casualty incident


  • Mass Casualty Incident (MCI) defined as an incident where the number of patients (or the rate of their arrival to a medical facility) overwhelms local resources (and the ability to immediately supplement them).[1][2]

Potential Causes of MCI

Mass casualty incident


ICS Organization Structure

Initial Triage

Incident Command System (ICS)

  • An Incident Command System (ICS) is designed to allow for coordination of response to an MCI by providing for an integrated organizational/command structure[3]
    • ICS has been in use since the 1970's.
    • Designed to expand or contract in size in response to scope of incident.
  • After the September 11, 2001 terrorist attacks, the Department of Homeland Security proposed the National Incident Management System (NIMS) in response to perceived deficiencies in coordination between emergency responders.[4]
    • NIMS mandates the use of ICS in the United States for MCI response[3]

External Links

See Also


  1. Briggs SM. Disaster management teams. Curr Opin Crit Care. 2005 Dec;11(6):585-9.
  2. Lee JS, Franc JM. Impact of a Two-step Emergency Department Triage Model with START, then CTAS, on Patient Flow During a Simulated Mass-casualty Incident. Prehosp Disaster Med. 2015 Jun 24:1-7.
  3. 3.0 3.1 FEMA IS 0100.b - Introduction to the Incident Command System (ICS), Student Manual. Accessed 07/24/2015.
  4. Jensen J, Youngs G. Explaining implementation behaviour of the National Incident Management System (NIMS). Disasters. 2015 Apr;39(2):362-88. doi: 10.1111/disa.12103.