What is a mass casualty incident (MCI)?

A mass casualty incident (MCI) is defined as an event that produces more patients than the healthcare system can manage with its existing resources. This definition highlights the overwhelming nature of such incidents, where the volume of victims necessitates a coordinated response that often involves multiple hospitals, emergency services, and possibly even regional or national resources.

In the context of disaster planning and response, recognizing an MCI is crucial for effective preparedness and response strategies. This includes establishing triage protocols, mobilizing additional medical personnel, and ensuring that communication and support systems are in place to handle the influx of patients beyond normal capacities.

The other options either mischaracterize the scope of resource requirements in relation to casualty numbers or focus on structural damage rather than on the medical care of injured individuals. For instance, a situation that involves multiple casualties manageable by existing healthcare resources does not qualify as an MCI, as it implies that the current system can adequately respond without overwhelming demand.