Mass Casualty Triage: START Method

Mass Casualty Triage: The START Method (Simple Triage and Rapid Treatment)

1. Comprehensive Introduction & Overview

In the theater of disaster medicine, the fundamental objective shifts from "doing the most for the individual" to "doing the greatest good for the greatest number." When the demand for medical care outstrips available resources—a scenario defined as a Mass Casualty Incident (MCI)—the standard clinical approach of comprehensive patient assessment must be abandoned in favor of rapid, algorithmic triage.

The START (Simple Triage and Rapid Treatment) method is the international gold standard for initial triage in multi-casualty settings. Developed in 1983 by the Hoag Hospital and the Newport Beach Fire Department, START provides a standardized, objective framework for categorizing victims within seconds. It is designed to be performed by first responders, including those with basic life support training, to ensure that life-saving interventions are prioritized for those most likely to survive with immediate care.

The core philosophy of START is to minimize subjective clinical judgment and maximize rapid, reproducible outcomes. By utilizing a color-coded tagging system, responders can effectively communicate patient status to transport and treatment teams, ensuring systemic efficiency under extreme duress.

2. Deep-Dive: Technical Specifications and Mechanisms

The START method relies on the assessment of three primary physiological parameters: Respiration, Perfusion, and Mental Status (RPM). The mechanism relies on a binary decision-making tree that forces a classification based on the most severe deficit identified.

The RPM Algorithm Protocol

1. Respiration: Is the patient breathing? If not, open the airway. If they start breathing, tag them "Red." If they remain apneic, tag them "Black" (Deceased). If they are breathing >30/min, tag them "Red."
2. Perfusion: Check the radial pulse. If absent, or capillary refill is >2 seconds, tag them "Red." If pulse is present, proceed to Mental Status.
3. Mental Status: Can the patient follow simple commands? If they cannot, tag them "Red." If they can, tag them "Yellow."

The Triage Tagging System

The classification system utilizes four standard colors recognized globally:

3. Clinical Indications & Usage

Indications for Use

START is indicated in any scenario where the number of casualties exceeds the immediate clinical capacity of responding units. This includes, but is not limited to:
* Natural disasters (earthquakes, hurricanes, floods).
* Technological or industrial accidents (chemical spills, factory explosions).
* Active violence incidents (mass shootings, terrorist attacks).
* Mass transit accidents (train derailments, aircraft crashes).

Clinical Staging and Grading

The application of START is a dynamic process. It is not a one-time event but a stage-gate in the patient's journey from the "Hot Zone" to the "Cold Zone."

1. Primary Triage (START): Performed at the point of injury. Goal: <60 seconds per patient.
2. Secondary Triage: Performed once the patient reaches the treatment area. More detailed clinical assessment (e.g., GCS, vital signs) is conducted here.
3. Tertiary Triage: Performed by medical providers at the point of definitive care or during transport.

The "JumpSTART" Variation

For pediatric patients, the JumpSTART algorithm is utilized. It accounts for the physiological differences in children, specifically the fact that apnea in children is often respiratory-driven rather than cardiac-driven. JumpSTART allows for five rescue breaths before declaring a pediatric patient "Black."

4. Risks, Side Effects, and Contraindications

Risks of Mis-Triage

• Under-Triage (False Green/Yellow): The most dangerous error, where a critical patient is categorized as minor or delayed, leading to preventable mortality.
• Over-Triage (False Red): While safer for the patient, it overwhelms the medical system, potentially causing critical resources to be diverted away from patients who are actually salvageable.

Contraindications

• Non-MCI Environments: START is not intended for standard ER or trauma bay settings where resources are sufficient for comprehensive, individualized care.
• Unsafe Environments: Triage should never be initiated until the scene is declared safe by law enforcement or hazmat teams (the "Hot Zone").
• Inadequate Training: Personnel who are not familiar with the RPM algorithm can cause confusion and systemic bottlenecks.

5. Pathophysiology and Clinical Presentation

In a mass casualty event, the primary pathophysiological threats are hemorrhagic shock, airway obstruction, and tension pneumothorax.

• Hemorrhagic Shock: The START method identifies this through the absence of a radial pulse or delayed capillary refill (>2 seconds). This indicates a drop in cardiac output and systemic perfusion.
• Airway Obstruction: The initial step of opening the airway in an apneic patient addresses the most common cause of preventable death in trauma: airway occlusion by the tongue or foreign bodies.
• Tension Pneumothorax/Respiratory Distress: Tachypnea (>30 breaths/min) is a sensitive indicator of physiological compensation in the face of hypoxia or thoracic trauma.

6. Frequently Asked Questions (FAQ)

1. What is the difference between START and SALT triage?

START focuses on RPM (Respiration, Perfusion, Mental Status). SALT (Sort, Assess, Lifesaving Interventions, Treatment/Transport) is a newer framework that emphasizes global sorting before individual assessment, providing a more refined approach for varied responders.

2. Can I perform interventions during START?

Yes, but they are limited to "life-saving interventions" only: opening an airway, controlling major hemorrhage (tourniquets), and potentially administering an antidote in a chemical incident.

3. How long should I spend on one patient?

The goal is 30 to 60 seconds. START is designed for speed, not clinical depth.

4. What if the patient is unconscious but breathing?

If they are breathing adequately but cannot follow commands, they are tagged "Red" (Immediate).

5. Are pulse oximetry or blood pressure cuffs used in START?

No. These require equipment that is often unavailable or too slow to use in a mass casualty scene. START relies solely on physical observation and palpation.

6. What do I do with the "walking wounded" (Green)?

They should be moved to a designated assembly area away from the primary treatment site to keep the scene clear for critical patients.

7. Is the Black tag permanent?

In an MCI, the "Black" (Expectant) tag signifies that the patient is not expected to survive with the current resource allocation. If resources become available later, the patient may be re-triaged.

8. How does START handle internal bleeding?

START is notoriously poor at identifying internal hemorrhage that has not yet caused systemic shock. This is why secondary triage is essential once the patient is in the treatment area.

9. What if a patient deteriorates after being tagged?

Triage is a continuous process. If a patient’s status changes, their tag must be updated immediately to reflect their current clinical need.

10. Does START require special equipment?

Only standard triage tags (color-coded cards) and, if available, tourniquets or airway adjuncts (e.g., OPA).

7. Long-Term Prognosis and Systems Management

The long-term prognosis for victims of an MCI is heavily dependent on the efficiency of the initial START triage. Patients tagged as "Red" who receive rapid surgical intervention (damage control surgery) show significantly higher survival rates than those whose triage is delayed.

Systemic Success Metrics:
* Time to First Transport: The time elapsed from the incident to the first ambulance leaving the scene.
* Triage Accuracy Rate: The percentage of patients correctly categorized compared to their clinical reality upon arrival at the hospital.
* Resource Utilization Efficiency: The ratio of Red-tagged patients to hospital surgical capacity.

The START method remains the bedrock of disaster preparedness. By standardizing the initial encounter, it allows the healthcare system to transition from a state of chaos to a structured, scalable response. Mastery of this algorithm is not merely a clinical skill; it is a moral imperative for every medical professional operating in the public health sector.

Disclaimer: This guide is for educational purposes only and should not replace formal training or institutional protocols. Always follow the specific mass casualty protocols established by your local EMS agency and medical director.