Explain the ABCDE of trauma

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The ABCDE of Trauma - Primary Survey

The ABCDE approach is the systematic framework for the primary survey in trauma, developed by the Advanced Trauma Life Support (ATLS) program of the American College of Surgeons. It prioritizes assessment and treatment of immediately life-threatening conditions in a fixed sequence, ensuring the most lethal problems are addressed first.

The principle is: treat as you find - do not move to the next step until the current threat is managed or excluded.

ABCDE Trauma Flowchart - Assessment and Management

A - Airway (with Cervical Spine Protection)

Goal: Confirm the airway is open and patent; protect the cervical spine.

Assessment:

Ask the patient their name and what happened - a clear vocal response confirms the airway is open and gives information about breathing, circulation, and consciousness simultaneously
Listen for stridor or hoarseness (suggesting partial obstruction or laryngeal injury)
Inspect for obstruction: blood, vomit, foreign bodies, tongue prolapse, facial/mandibular fractures
Look for crepitus in the neck, hemoptysis, or cyanosis - these may indicate tracheobronchial injury requiring immediate operative repair

Interventions:

Suction and clear the oropharynx
Chin lift / jaw thrust maneuver
Oropharyngeal or nasopharyngeal airway adjuncts
Bag-valve-mask ventilation with 100% oxygen
Definitive airway (intubation) if: GCS <8, combativeness impairing assessment, obtundation from severe shock, or anticipated airway deterioration
Surgical airway (cricothyroidotomy) if intubation fails

Cervical spine: Apply inline manual immobilization in all blunt trauma until the spine is clinically cleared.

B - Breathing

Goal: Ensure adequate oxygenation and ventilation.

Assessment:

Observe for symmetric, non-labored chest wall movement
Auscultate lung fields bilaterally - absent or unequal breath sounds indicate hemothorax or pneumothorax
Monitor with pulse oximetry; use end-tidal CO2 (EtCO2 target: 35-40 mmHg) if available
Percussion: hyper-resonance = pneumothorax; dullness = hemothorax

Key diagnoses and immediate treatment:

Condition	Findings	Treatment
Tension pneumothorax	Absent breath sounds, hyper-resonance, absent chest rise, hemodynamic collapse	Immediate needle decompression (14G angiocatheter, 4th-5th ICS, anterior midaxillary line), then tube thoracostomy
Open ("sucking") pneumothorax	Large chest wall defect (>3 cm), audible air movement	3-sided occlusive dressing (flutter valve effect), then tube thoracostomy away from wound
Hemothorax	Dullness to percussion, decreased breath sounds	Tube thoracostomy; operative if >1,500 mL initial output or >200 mL/hr for ≥4 hours
Flail chest	Paradoxical chest wall movement	Analgesia, supplemental O2, positive pressure ventilation if failing

C - Circulation (with Hemorrhage Control)

Goal: Identify and control hemorrhage; assess for shock.

Assessment:

Vital signs: blood pressure, heart rate
Palpate central and peripheral pulses (including distal to any injured extremity)
Assess skin color, temperature, capillary refill
Hard signs of vascular trauma: active arterial bleeding, absent pulse in an injured limb, expanding/pulsatile hematoma, bruit or thrill at injury site - these mandate operative intervention or urgent imaging

Interventions:

Direct compression or tourniquet for external bleeding (note exact time of tourniquet application)
Pelvic binder for pelvic fracture with hypotension (closes pelvic ring, tamponades retroperitoneal hemorrhage)
Splint long-bone fractures to reduce hemorrhage (traction splint for mid-shaft femur)
Large-bore IV access x2; send blood for CBC, coagulation, type and cross-match
FAST (Focused Assessment with Sonography for Trauma) to detect hemoperitoneum or pericardial effusion
Blood product resuscitation (balanced transfusion: packed red cells, FFP, platelets in 1:1:1 ratio for massive hemorrhage)

Important caveat: In a patient in extremis from presumed hemorrhagic shock, hemorrhage control may supersede airway evaluation. Resuscitative ED thoracotomy (EDT) or REBOA (Resuscitative Endovascular Balloon Occlusion of the Aorta) may be required for non-compressible hemorrhage.

D - Disability (Neurological Status)

Goal: Rapidly assess the brain and spinal cord.

Assessment:

AVPU scale (quick screen): Alert / Verbal / Pain / Unresponsive
Glasgow Coma Scale (GCS): Eyes (1-4) + Verbal (1-5) + Motor (1-6) = total score 3-15
- GCS <8 = severe TBI; intubation is indicated
Pupillary response: size, symmetry, reaction to light - unequal pupils suggest uncal herniation
Motor and sensory examination of all four limbs for spinal cord injury
Blood glucose to rule out hypoglycemia as a reversible cause of altered mental status

Interventions:

Optimize oxygenation and perfusion to the brain (hypoxia and hypotension are the primary secondary injury mechanisms)
Emergency neurosurgical consultation for evidence of herniation
Cervical spine immobilization continues
Head/neck/spine CT once stabilized
Intracranial pressure monitoring when indicated

E - Exposure and Environment

Goal: Fully expose the patient to identify all injuries; prevent hypothermia.

Assessment:

Remove all clothing (cut away if necessary) to perform a complete head-to-toe inspection
Log roll the patient to examine the back, spine, and buttocks
Inspect all skin surfaces for wounds, bruising, deformity, or evidence of penetrating injury
Perineal and rectal examination when indicated

Environment - prevent hypothermia:

Hypothermia in trauma is part of the "lethal triad" (hypothermia + acidosis + coagulopathy) which dramatically worsens outcomes
Use warm IV fluids, warming blankets, and warm environment
Cover the patient as soon as exposure is complete

The "(C)ABCDE" Extension

Modern trauma protocols, particularly in military and pediatric contexts, add a "C" before the A - making it C-ABCDE:

C = Catastrophic (external) hemorrhage - massive compressible bleeding (e.g., limb amputation, junctional wounds) that will kill faster than an airway problem must be controlled first with tourniquets or wound packing before anything else

After the Primary Survey

Once ABCDE is complete and the patient is stabilized, the secondary survey begins - a systematic head-to-toe physical examination documenting all injuries. The ABCDE survey should be repeated whenever the patient's status changes, as new threats can emerge at any time.

Sources: Fischer's Mastery of Surgery, 8th ed.; Miller's Anesthesia, 10th ed.; Tintinalli's Emergency Medicine - based on ATLS (American College of Surgeons) curriculum.

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