11.1 Triage Systems & Trauma Center Levels I-IV

11.1 Triage Systems & Trauma Center Levels I-IV

Clinical Core: Trauma triage is a dynamic, risk-stratified decision process designed to rapidly identify critically injured patients and direct them to the appropriate level of trauma care within the optimal timeframe. Certified trauma nurses must master both out-of-hospital field triage algorithms and facility-based triage decision-making to optimize patient outcomes and minimize preventable mortality.

American College of Surgeons (ACS) Field Triage Decision Scheme

The ACS Committee on Trauma (ACS-COT) Field Triage Decision Scheme provides emergency medical services (EMS) and trauma triage nurses with a standardized, evidence-based 4-step decision tree to identify patients requiring transport to a designated trauma center.

Step 1: Physiological Criteria

Physiological instability represents the most urgent indicator of life-threatening injury. A patient meeting ANY of the following physiological thresholds must be transported to the highest level of care within the defined trauma system (Level I or Level II trauma center):

• Glasgow Coma Scale (GCS): Score ≤ 13.
• Systolic Blood Pressure (SBP): < 90 mmHg in adults. For pediatric patients (< 15 years), SBP < 70 + (2 × age in years). For adults aged ≥ 65 years, SBP < 110 mmHg may signal occult shock.
• Respiratory Rate: < 10 or > 29 breaths per minute (< 20 breaths per minute in infants under 1 year), or the immediate need for ventilatory support.

Step 2: Anatomical Criteria of Injury

Even if vital signs remain transiently normal due to compensatory mechanisms, specific anatomical injuries carry an extreme risk of rapid decompensation and mortality:

• Penetrating Injuries: All penetrating wounds to the head, neck, torso, and extremities proximal to the elbow or knee.
• Chest Wall Instability: Flail chest (two or more contiguous ribs fractured in two or more places).
• Long-Bone Fractures: Two or more proximal long-bone fractures (e.g., bilateral femur or humerus fractures).
• Extremity Trauma: Crushed, degloved, mangled, or pulseless extremity; traumatic amputation proximal to the wrist or ankle.
• Pelvic Fractures: Suspected pelvic ring disruption (high risk for massive retroperitoneal hemorrhage).
• Skull Fractures: Open or depressed skull fractures.
• Neurological Deficits: Post-traumatic paralysis or acute motor/sensory deficit.

Step 3: Mechanism of Injury & High-Energy Impact

High-energy transfer can produce occult, life-threatening internal organ disruption without immediate physiological abnormalities:

• Falls: Adults > 20 feet (6 meters); Children (< 15 years) > 10 feet (3 meters) or two to three times the height of the child.
• High-Risk Auto Crash:
  • Intrusion into the passenger compartment > 12 inches at occupant site or > 18 inches at any site.
  • Ejection (partial or complete) from the automobile.
  • Death of another occupant in the same passenger compartment.
  • Vehicle telemetry data consistent with a high risk of severe injury.
• Vulnerable Impact: Auto vs. pedestrian or bicyclist thrown, run over, or impacted at > 20 mph; motorcycle crash > 20 mph.

Step 4: Special Considerations & Vulnerable Populations

The final step evaluates patient-specific risk factors that alter physiological response to trauma:

• Older Adults: Risk of traumatic brain injury and mortality increases significantly after age 55. Low-energy mechanisms (e.g., ground-level falls) can cause fatal cervical spine or intracranial injuries. Anticoagulant and antiplatelet medications dramatically increase hemorrhage risk.
• Pediatrics: Children should be triaged preferentially to a pediatric trauma center or a trauma center with qualified pediatric capabilities.
• Anticoagulation & Bleeding Disorders: Patients on warfarin, direct oral anticoagulants (DOACs), or antiplatelet agents require rapid evaluation for intracranial bleeding.
• Burns: Major burn injuries without concomitant trauma should go to a designated Burn Center. Burn injuries WITH concomitant trauma must be triaged to a Trauma Center first for stabilization.
• Pregnancy: Gestational age > 20 weeks requires continuous fetal monitoring and specialized obstetric-trauma co-management.
• EMS Clinician Judgment: EMS providers may transport to a trauma center based on overall clinical presentation even if criteria in Steps 1-3 are not strictly met.

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Trauma Center Designation Levels I-IV

Trauma center designation reflects institutional capability, resource availability, surgical readiness, and clinical depth. The ACS-COT establishes national guidelines for verification, while state governments grant formal designation.

Interfacility Transfer & Nursing Responsibilities

When a patient presents to a Level III or IV facility with injuries exceeding local capabilities, prompt transfer to a Level I or II center is vital. Key nursing responsibilities include:

1. Airway & Hemodynamic Stabilization: Prior to transport, secure the airway, establish large-bore IV access, and initiate blood product resuscitation.
2. Standardized Communication: Utilize SBAR (Situation, Background, Assessment, Recommendation) to hand off essential clinical details to the receiving trauma team.
3. Documentation & Transport Management: Ensure complete copies of medical records, imaging (on disc/cloud transfer), and lab results accompany the patient. Continuous monitoring must be maintained throughout transit by qualified transport personnel.

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Mass Casualty Incident (MCI) Triage: START & JumpSTART

During a Mass Casualty Incident (MCI), triage shifts from prioritizing the most critically ill individual to doing the greatest good for the greatest number of casualties.

START Algorithm (Adults)

Evaluates three physiological parameters in under 60 seconds using the RPM mnemonic:

• Respirations: If absent, open the airway. If still apneic → Black (Expectant). If breathing resumes → Red (Immediate). If rate > 30 breaths/min → Red (Immediate). If rate < 30, evaluate Perfusion.
• Perfusion: Assess radial pulse or capillary refill. If capillary refill > 2 seconds or radial pulse absent → Red (Immediate). If pulse present and refill ≤ 2 seconds, evaluate Mental Status.
• Mental Status: Assess ability to follow simple commands ("squeeze my hand"). If unable to follow commands → Red (Immediate). If able to follow commands → Yellow (Delayed).
• Walking Wounded: Any patient able to walk on command at the scene is initially tagged Green (Minor).

JumpSTART Algorithm (Pediatrics < 8 Years)

Modified for pediatric physiology. If a child is apneic after opening the airway, the clinician checks for a peripheral pulse. If a pulse is present, give 5 rescue breaths. If breathing resumes → Red (Immediate); if still apneic → Black (Expectant).