Trauma & ATLS Protocol: Triage, ABCDE, Airway & Nexus Criteria

Trauma is a leading cause of morbidity and mortality worldwide, and its management requires a systematic and time-sensitive approach. The ATLS 10th Edition provides a standardized framework to assess and manage trauma patients effectively. It emphasizes outcome-driven care, early intervention, and prioritization of life-threatening conditions.

Triage

Triage is a fundamental concept in trauma management, especially in busy trauma centers or mass casualty scenarios. It is a color-coding system designed to prioritize patients based on:

1. Resources Required vs. Resources Available: Patients are referred if local facilities lack necessary resources (e.g., CT scan for head injury).

2. Outcome: Prioritizes patients with the best potential for a positive outcome.

3. Severity: Balances severity with outcome potential. A patient with a tension pneumothorax (severe, but high survival chance with simple intervention) is prioritized over one with aortic transection (highly severe, poor outcome even with complex intervention) to maximize overall survival. (Memory Tip: Avoid wasting resources on patients with poor outcomes when others have a better chance.)

Triage Color Codes

• Red Band [Emergency]: Requires immediate attention for critical conditions.

• Yellow Band [Urgent]: Requires urgent attention after red-band patients.

• Green Band [Delayed Presentation]: Delayed response patients, hemodynamically stable, management can be deferred.

• Blue Band [Expectant]: Needs referral to a specific department or facility for quick transfer.

• Black Band [Dead/Mori-bund]: Brought-dead or mori-bund patients; intervention not indicated.

Trimodal Distribution of Mortality

Trauma mortality follows a trimodal distribution, with three distinct peaks:

1. Peak 1: At the time of Trauma: Maximum mortality occurs immediately at the scene due to devastating, unsurvivable injuries. Outcome is generally unchangeable.

2. Peak 2: Within 1 Hour of Trauma: This is the "Golden Hour of Trauma." Deaths typically result from hemorrhage, airway obstruction, or tension pneumothorax. Timely interventions during this period can drastically alter the patient's outcome. (Memory Tip: The "Golden Hour" is critical because interventions here yield the biggest difference in survival.)

3. Peak 3: Days to Weeks After Trauma: Mortality is usually due to complications like reperfusion injuries, sepsis, or Multiple Organ Dysfunction Syndrome (MODS), which are generally more manageable.

Primary and Secondary Surveys

Upon arrival, trauma patients undergo two main assessments:

• Primary Survey:

• Goal: To rule out any immediate life-threatening injuries. Rapidly identifies and addresses urgent threats.

• Secondary Survey:

• Goal: To rule out any potentially life-threatening injuries. A detailed head-to-toe examination performed after immediate threats are controlled, identifying all injuries.

ABCDE Protocol for Primary Survey

The primary survey follows a structured, protocol-based approach known as ABCDE, representing the order of preference for assessment and intervention.

Comparison: ABCDE vs. C ABCDE

• ABCDE: Standard protocol for trauma assessment.

• C ABCDE: Used when visible, significant external hemorrhage is present. Controlling the hemorrhage (C) takes precedence over airway management, as uncontrolled bleeding is an immediate life threat.

Components of ABCDE

• A: Airway with Cervical Spine Stabilization

• B: Breathing and Ventilation

• C: Circulation with Hemorrhagic Control

• D: Disability Limitation

• E: Exposure and Environmental Control
  (Memory Tip: While presented sequentially, in polytrauma, these steps are often addressed concurrently by a team, with the listed order representing the hierarchy of life-threatening priorities.)

A: Airway with Cervical Spine Stabilization

This is the first and most critical component of the primary survey.

I. Cervical Spine Stabilization

• Principle: In all trauma patients, especially those involved in road traffic accidents, a cervical spine injury must be presumed until proven otherwise.

• Method: Apply a hard cervical collar to immobilize the neck.

II. Airway Assessment

• The most effective way to assess airway patency is by evaluating the patient's ability to communicate and speak without distress.

• Normal Airway: Patient can talk and provide history.

• Compromised Airway: Patient unable to communicate or speaks with distress.

III. Securing the Airway (Definitive Airway)

• Indications for Securing the Airway:

1. Inability to communicate or speak

2. Unconsciousness

3. Severe facial fractures

4. Presence of inspiratory stridor (especially after inhalational injury)

5. Suspected cerebral hypoperfusion

6. Glasgow Coma Scale (GCS) score less than or equal to 8 (prophylactic intubation)

• Airway Maneuvers: Before intubation, standard maneuvers include chin lift and jaw thrust.

• Methods of Intubation:

1. Orotracheal Intubation:

• Preferred route in trauma due to easier access.

• Contraindications: Severe facial fractures, inadequate mouth opening.

2. Nasotracheal Intubation:

• Indication: Used when orotracheal intubation is contraindicated.

• Contraindications: Anterior skull base fracture with cribriform plate fracture and CSF rhinorrhea. (Memory Tip: CSF rhinorrhea can be identified by a sniff test, halo/blot sign on gauze, or biochemical testing.)

• Management when Unable to Intubate (Emergency Airway):
  If both orotracheal and nasotracheal intubation fail or are contraindicated:

• Emergency Procedure: Needle Cricothyroidotomy

• Needle: Wide bore, 14-gauge needle.

• Insertion Site: Between the cricoid and thyroid cartilages (cricothyroid membrane).

• Next Step: Connect to high-flow oxygen (15 L/minute) for temporary ventilation.

• Definitive Procedure: Emergency Tracheostomy or Surgical Cricothyroidotomy

• Tracheostomy Incision: In emergency, a vertical midline neck incision is preferred.

• Cricothyroidotomy Contraindication: Contraindicated in children less than 12 years old; tracheostomy is preferred for surgical airway in children.

• Endotracheal Tube (ETT) Size: Typically 5-7 mm size tube for intubation.

Cervical Spine Injury Assessment: The Nexus Criteria

The Nexus Criteria (National Emergency X-ray Utilization Study) is critical for assessing cervical spine injury.

Role of X-ray in Cervical Spine Injury Assessment

Every trauma patient should undergo a c-spine X-ray. While evidence of injury on X-ray confirms C-spine injury, no evidence does not definitively rule out an injury, as some are not traceable by X-ray alone.

Nexus Criteria for Clinically Ruling Out Cervical Spine Injury

To rule out a cervical spine injury when the X-ray appears normal, all five criteria must be met:

1. No Posterior Midline Cervical Tenderness: The single most important criterion. Pain or wincing upon gentle stroking of the cervical spine midline indicates suspicion.

2. No Evidence of Intoxication: Patients must be in a state of absolute sensus to accurately report pain or tenderness.

3. Normal Level of Alertness: Patients must demonstrate a normal level of alertness and not have a low Glasgow Coma Scale (GCS) score.

4. No Focal Neurological Deficit: Absence of any focal neurological deficit is required.

5. No Painful Distracting Injuries: The patient must not have any other painful distracting injuries (e.g., a crushed limb) that could mask C-spine pain.

Summary of Nexus Rule-Out Process

A cervical spine injury can be ruled out if there is no evidence of injury on a C-spine X-ray and ALL five clinical Nexus criteria are met.

Airway Management Devices

Various devices aid airway management:

• Oropharyngeal Airway (OPA): Requires 180° rotation for proper positioning.

• I-gel: Placed in the esophagus, it is lifted to direct air into the trachea.

• Laryngeal Tube & Laryngeal Mask Airway (LMA): Devices for airway control.

• Multi-lumen Esophageal Tube: Less popular; inserted into the esophagus with a cuff, using fenestrations to direct air to the trachea.