Disasters and Mass Casualty Incidents

Mass Casualty events may occur as a result of natural or human-caused disasters or after an act of terrorism. The planning and response to disasters and catastrophes needs to take into consideration the distinction between progressive   and sudden events. Insidious or slowly progressive disasters produce a large number of victims but over a prolonged time period, with different peaks in the severity of patients presenting to the hospital. For example, radiation events will produce a large number of victims who will present days, weeks, months, or years after exposure, depending on the dose of radiation received. The spread of a biological agent or a pandemic will produce an extremely high number of victims who will present to hospitals during days to weeks after the initial event, depending on the agent and progression of symptoms.
On the other hand, in a sudden disaster, there is an abrupt surge of victims resulting from an event such as an explosion or a chemical release. After the sarin gas attack in a Tokyo subway in 1995, a total of 5500 victims were injured and required medical attention at local hospitals immediately after the attack. The car bomb that exploded near the American Embassy in Nairobi, Kenya, killed 213 people and simultaneously produced 4044 injured patients, many requiring medical care at local hospitals. The Madrid train bombing in March 2004 produced more than 2000 injured victims in minutes, overwhelming the city's healthcare facilities. More than 500 injured patients were treated at local hospital after the mass shooting in Las Vegas. Finally, earthquakes may produce a large number of victims in areas in which the medical facilities are partially or completely destroyed. Sudden events bring an immediate operational challenge to community healthcare systems, many of which are already operating at or above capacity.
The pre-hospital as well as hospital planning and response to sudden mass casualty incidents (SMCI's) is extremely