During a mass casualty incident involving a suspected infectious disease outbreak, which action should the triage nurse prioritize first?

In mass casualty incidents involving suspected infectious diseases, the first priority is activating the hospital's emergency preparedness plan and incident command system to coordinate the overall response and ensure proper resource allocation.

In a mass casualty situation involving suspected infectious diseases or bioterrorism, the emergency room nurse's first priority is to activate the hospital's emergency preparedness plan and incident command system. There are several reasons why this systematic approach is important.

The Incident Command System (ICS) provides a standardized framework for coordinating emergency response efforts. It establishes clear lines of authority, communication channels, and resource allocation protocols. Without this basic structure, individual interventions can be ineffective or even counterproductive.

When multiple patients present with similar symptoms suggesting an infectious disease or bioterrorism, the situation requires immediate coordination among multiple departments such as infection control, laboratory, pharmacy, security, and administration. The emergency preparedness plan ensures that all necessary personnel are notified simultaneously and appropriate protocols are implemented consistently.

Activation of the incident command system also triggers critical safety measures such as establishing isolation areas, securing the facility, coordinating with public health authorities, and implementing communication protocols with families and the media. This comprehensive approach protects both patients and healthcare workers while ensuring effective care delivery.

Decontamination, isolation precautions, and immediate patient care are all important interventions, but they must be coordinated through the incident command structure to be most effective. The systematic approach prevents chaos, ensures resource availability, and maintains safety standards throughout the emergency response.

Priority Action in a Mass Casualty Incident with Suspected Bioterrorism

The correct answer is 4. Activate the hospital's emergency preparedness plan and incident command system.

In a mass casualty incident (MCI), especially one involving a suspected infectious disease or bioterrorism event, the initial priority is not individual patient care but rather the establishment of a robust organizational framework to manage the overwhelming influx of patients and resources. The first action a triage nurse should take is to activate the hospital's emergency preparedness plan and incident command system (ICS). This system provides a standardized, scalable structure for command, control, and coordination, ensuring that all subsequent actions—from triage and decontamination to treatment and resource allocation—occur in a safe, organized, and effective manner. Without this overarching command structure, individual interventions like decontamination or treatment can become chaotic, leading to significant safety risks for both patients and staff, as well as inefficient use of limited resources.

The critical nature of this initial step is underscored by the consequences of poor triage and incident management. A systematic review and meta-analysis on prehospital MCI triage highlights the prevalence of both undertriage and overtriage ^[1]. Undertriage—failing to identify critically injured or ill patients—directly leads to preventable morbidity and mortality. Conversely, overtriage—assigning limited high-acuity resources to patients with non-life-threatening conditions—can overwhelm a facility’s capacity, delaying care for the most critically ill and paradoxically increasing overall mortality ^[1]. Activating the hospital's emergency plan and ICS is the foundational step to mitigate these risks. The ICS establishes a clear chain of command and specific roles, such as a triage officer, treatment team leaders, and a safety officer, which standardizes the triage process and helps reduce the variability that contributes to inaccurate triage decisions ^[1].

The other options represent actions that are essential but must occur within the framework of an activated command system. Initiating decontamination (Option 1) or isolation (Option 2) before a full scene and resource assessment is complete can create bottlenecks and may be inappropriate if the agent is later determined not to be transmissible through casual contact. Similarly, starting immediate critical care (Option 3) without a coordinated system can rapidly deplete staff and supplies, leaving the department unable to manage the next wave of patients. The ICS activation ensures that a hospital-wide response is mobilized, bringing in additional personnel, securing supplies, and establishing communication with public health and emergency management agencies, which is the true first priority for a triage nurse in this scenario ^[1].