Advanced Trauma Life Support (ATLS)

Introduction

Trauma is a leading cause of death, particularly in the first four decades of life, and ranks as the third most common cause of death overall. The Advanced Trauma Life Support (ATLS) program was developed to provide a systematic approach to the management of trauma patients, ensuring that life-threatening conditions are identified and treated promptly.

Mechanisms of Injury

In trauma, injuries can be classified based on their mechanisms:

Overt Mechanisms

1. Penetrating Trauma: Injuries caused by objects that penetrate the skin and underlying tissues.
2. Blunt Trauma: Injuries resulting from impact without penetration, such as collisions or falls.
3. Thermal Trauma: Injuries caused by heat, including burns.
4. Blast Injury: Injuries resulting from explosions, which can cause a combination of blunt and penetrating injuries.

Covert Mechanisms

1. Blunt Trauma: Often results in internal injuries that may not be immediately apparent.
2. Penetrating Trauma: Can include knife wounds and other sharp objects.
3. Penetrating Knife: Specific injuries from stabbing.
4. Gunshot Injury: Injuries caused by firearms, which can have extensive internal damage.

The track of penetrating injuries can often be identified by the anatomy involved, helping to determine which organs may be injured.

Steps in ATLS

The ATLS protocol consists of a systematic approach to trauma management, divided into two main surveys:

1. Primary Survey

• Objective: Identify and treat life-threatening conditions.
• Components:
  • A - Airway: Ensure the airway is patent. In patients with a Glasgow Coma Scale (GCS) of 8 or less, immediate intubation is necessary. Maintain cervical spine stability.
  • B - Breathing: Assess ventilation and oxygenation. Administer high-flow oxygen via a reservoir mask. Identify and treat conditions such as tension pneumothorax, flail chest, massive hemothorax, and open pneumothorax.
  • C - Circulation: Evaluate circulation based on:
    • Conscious level (indicates cerebral perfusion)
    • Skin color
    • Rapid, thready pulse (more reliable than blood pressure)
  • D - Disability: Assess neurological status using the Glasgow Coma Scale (GCS).
  • E - Exposure: Fully expose the patient to assess for injuries on the front and back.

2. Secondary Survey

• Objective: Conduct a thorough head-to-toe examination to identify all injuries.
• Components:
  • AMPLE: A mnemonic to gather important patient history:
    • A - Allergy: Any known allergies.
    • M - Medications: Current medications the patient is taking.
    • P - Past Medical History: Relevant medical history.
    • L - Last Meal: When the patient last ate.
    • E - Events of Incident: Details about the mechanism of injury.

Triage

Triage is the process of sorting patients based on the severity of their condition. The term "triage" comes from the French word meaning "to sort." In trauma settings, patients are categorized using a color-coded system:

• Red: First priority (critical patients, e.g., tension pneumothorax).
• Yellow: Second priority (urgent cases, e.g., pelvic fracture).
• Green: Third priority (minor injuries, e.g., simple fracture).
• Black: Zero priority (patients who are dead or unsalvageable).

Blunt Trauma

• Common Causes: The most frequent cause of blunt trauma is road traffic accidents.
• Seat Belt Use: Wearing seat belts significantly reduces mortality rates:
  • Front row occupants: 45% reduction in death rate.
  • Rear seat belt use: 80% reduction in death rate for front seat occupants.
• Seat Belt Injuries: Marks on the thorax indicate a fourfold increase in thoracic injuries, while abdominal marks indicate a threefold increase in abdominal injuries.

Radiographs in Trauma

Key radiographic views to obtain in trauma cases include:

1. Lateral cervical spine
2. Anteroposterior chest
3. Anteroposterior pelvis

Cricothyroidotomy

Cricothyroidotomy is a surgical procedure that involves making an incision through the skin over the cricothyroid membrane, which is located between the thyroid and cricoid cartilages in the neck. This procedure is performed to establish an emergency airway in situations where intubation is not possible or has failed, such as in cases of severe airway obstruction, facial trauma, or anaphylaxis.

Indications

Cricothyroidotomy is indicated in the following situations:

• Acute Airway Obstruction: When there is a complete blockage of the upper airway due to swelling, foreign body, or trauma.
• Failed Intubation: When attempts to secure an airway via endotracheal intubation have been unsuccessful.
• Facial or Neck Trauma: In cases where traditional airway management is compromised due to injury.
• Severe Anaphylaxis: When rapid airway access is needed and other methods are not feasible.

Anatomy

• Cricothyroid Membrane: The membrane lies between the thyroid and cricoid cartilages and is a key landmark for the procedure.
• Surrounding Structures: Important structures in the vicinity include the carotid arteries, jugular veins, and the recurrent laryngeal nerve, which must be avoided during the procedure.

Procedure

Preparation

1. Positioning: The patient should be in a supine position with the neck extended to improve access to the cricothyroid membrane.
2. Sterilization: The area should be cleaned and sterilized to reduce the risk of infection.
3. Anesthesia: Local anesthesia may be administered, but in emergency situations, this step may be skipped.

Steps

1. Identify the Cricothyroid Membrane: Palpate the thyroid and cricoid cartilages to locate the membrane, which is typically located about 1-2 cm below the thyroid notch.
2. Make the Incision: Using a scalpel, make a vertical incision through the skin over the cricothyroid membrane, approximately 2-3 cm in length.
3. Incise the Membrane: Carefully incise the cricothyroid membrane horizontally to create an opening into the airway.
4. Insert the Airway Device:
   • A tracheostomy tube or a large-bore cannula (e.g., a 14-gauge catheter) is inserted into the opening to establish an airway.
   • Ensure that the device is positioned correctly to allow for ventilation.
5. Secure the Airway: If using a tracheostomy tube, secure it in place to prevent dislodgment.

Post-Procedure Care

• Ventilation: Connect the airway device to a bag-valve-mask (BVM) or ventilator to provide oxygenation and ventilation.
• Monitoring: Continuously monitor the patient for signs of respiratory distress, oxygen saturation, and overall stability.
• Consider Further Intervention: Plan for definitive airway management, such as a formal tracheostomy or endotracheal intubation, once the immediate crisis is resolved.

Complications

While cricothyroidotomy is a life-saving procedure, it can be associated with several complications, including:

• Infection: Risk of infection at the incision site.
• Hemorrhage: Potential bleeding from surrounding vessels.
• Damage to Surrounding Structures: Injury to the recurrent laryngeal nerve, carotid arteries, or jugular veins.
• Subcutaneous Emphysema: Air escaping into the subcutaneous tissue.
• Tracheal Injury: If the incision is not made correctly, there is a risk of damaging the trachea.