12.1 ATLS Primary/Secondary Survey, Thoracic & Abdominal Trauma

Advanced Trauma Life Support (ATLS) Principles

Trauma remains a leading cause of morbidity and mortality globally, and motor vehicle accidents (MVAs) represent a significant public health burden in Saudi Arabia. The Advanced Trauma Life Support (ATLS) framework provides a structured, prioritized approach to evaluating and managing the multiply injured patient. The core philosophy of ATLS is to identify and treat the greatest threats to life first, operating under the assumption that missing a critical injury is more dangerous than taking a definitive but potentially unnecessary action.

The Primary Survey: ABCDE Approach

The primary survey is designed to identify and immediately treat life-threatening conditions. It follows the ABCDE mnemonic:

A: Airway and Cervical Spine Protection

The first priority is establishing a patent airway while simultaneously protecting the cervical spine. In any patient with multisystem trauma, particularly blunt trauma above the clavicles, a cervical spine injury must be assumed until proven otherwise.

• Assessment: Ask the patient their name. A clear response confirms a patent airway, sufficient ventilation, and brain perfusion.
• Interventions: If the airway is compromised, perform a jaw-thrust maneuver (avoid head-tilt/chin-lift to protect the c-spine), clear secretions, and insert an oropharyngeal or nasopharyngeal airway. If these fail or if the patient has a Glasgow Coma Scale (GCS) score <= 8, definitive airway management with endotracheal intubation is required.

B: Breathing and Ventilation

A patent airway does not guarantee adequate ventilation. The chest must be examined to evaluate lung expansion and oxygenation.

• Assessment: Inspect for chest wall asymmetry, contusions, or penetrating wounds. Auscultate for breath sounds and percuss for dullness or hyperresonance.
• Life-Threatening Conditions: Identify tension pneumothorax, massive hemothorax, open pneumothorax, and flail chest.
• Interventions: Provide supplemental oxygen to all trauma patients. For tension pneumothorax, immediately perform needle decompression (typically at the 5th intercostal space, mid-axillary line) followed by a tube thoracostomy.

C: Circulation with Hemorrhage Control

Hemorrhage is the predominant cause of preventable post-injury deaths.

• Assessment: Evaluate level of consciousness, skin color, and pulses. Tachycardia is often the earliest sign of hypovolemic shock, while hypotension is a late and ominous finding.
• Interventions: Apply direct manual pressure to external bleeding. For massive extremity hemorrhage not controlled by pressure, apply a tourniquet. Establish robust intravenous access (two large-bore peripheral IVs) and initiate fluid resuscitation with warm isotonic crystalloids, rapidly transitioning to balanced blood product administration (1:1:1 ratio of PRBCs, FFP, and platelets) for massive hemorrhage.

D: Disability (Neurologic Evaluation)

Perform a rapid neurologic assessment to establish the patient's baseline and identify signs of impending herniation.

• Assessment: Calculate the GCS score and evaluate pupillary size and reactivity.
• Interventions: Prevent secondary brain injury by maintaining adequate oxygenation and perfusion. If signs of uncal herniation are present (e.g., unilaterally dilated pupil, contralateral hemiparesis), consider brief hyperventilation and osmotic therapy (mannitol or hypertonic saline) while arranging urgent neurosurgical consultation.

E: Exposure and Environmental Control

The patient must be completely undressed to allow for a thorough examination, including the back.

• Interventions: Log-roll the patient to examine the spine and rectum. Once exposed, immediately cover the patient with warm blankets or use forced-air warming devices to prevent hypothermia, which exacerbates coagulopathy and acidosis (the "lethal triad" of trauma).

Thoracic Trauma

Thoracic injuries are common and can rapidly lead to hypoxia or hemodynamic collapse. Understanding the presentation of specific injuries is crucial.

Abdominal and Pelvic Trauma

The abdomen is a frequent site of occult hemorrhage. The mechanism of injury (blunt vs. penetrating) dictates the diagnostic approach.

Focused Assessment with Sonography for Trauma (FAST)

The FAST exam is a rapid, non-invasive bedside ultrasound used to detect free intraperitoneal fluid (which in the setting of trauma is presumed to be blood) and pericardial effusion. It evaluates four windows:

1. Perihepatic (Morison's pouch): Between the liver and right kidney.
2. Perisplenic: Between the spleen and left kidney.
3. Pelvic: Superior to the symphysis pubis, evaluating the rectovesical or rectouterine pouch.
4. Pericardial: Subxiphoid view to evaluate for tamponade.

A positive FAST in a hemodynamically unstable patient is an indication for immediate exploratory laparotomy. If the patient is stable, a CT scan of the abdomen and pelvis is the gold standard for identifying specific solid organ injuries.

Pelvic Fractures

Pelvic ring disruptions can cause massive retroperitoneal hemorrhage from venous plexuses or arterial branches (e.g., internal iliac artery).

• Diagnosis: Suspect in patients with a suggestive mechanism, pelvic pain, or instability on physical exam (do not repeatedly test for instability as this can dislodge clots).
• Management: Place a pelvic binder centered over the greater trochanters to reduce pelvic volume and control venous bleeding. If the patient remains unstable despite binding and blood transfusion, options include preperitoneal pelvic packing or angioembolization.

The Secondary Survey

The secondary survey begins only after the primary survey is complete, resuscitative efforts are underway, and the patient's vital signs are normalized. It involves a "head-to-toe" evaluation, a complete neurological exam, and obtaining a comprehensive history using the AMPLE mnemonic: Allergies, Medications, Past illnesses/Pregnancy, Last meal, and Events/Environment related to the injury. It also includes obtaining definitive imaging studies and specialized consultations.