You respond to a call for a fall from a ladder. Your patient is alert, oriented, and refusing transport, complaining only of a mild headache. It’s tempting to clear them, but inside their skull, a bleed could be expanding. This is the deceptive danger of Traumatic Brain Injury (TBI), where the most life-threatening threats often hide behind a mask of normalcy.
What is Traumatic Brain Injury?
Traumatic Brain Injury (T-B-I) is a disruption in normal brain function caused by a bump, blow, or jolt to the head, or by a penetrating head injury. It ranges from mild—commonly called a concussion—to severe, permanent brain damage. To visualize the mechanism, imagine the brain as soft tofu floating in fluid inside a hard, bony bowl. When the head stops suddenly (like hitting a dashboard), the brain keeps moving, slamming into the skull, bruising the tissue, or tearing blood vessels.
Why TBI Matters in the Field
TBI is a time-sensitive injury because of secondary brain injury. While you cannot fix the initial damage that happened at the moment of impact, you can prevent the damage that happens next—specifically hypoxia (low oxygen) and hypotension (low blood pressure). In the brain, even a brief drop in blood pressure or oxygen can double mortality rates. Your job is to stabilize the patient’s airway, breathing, and circulation to protect the brain from further insult while rushing them to definitive care.
What You’ll Actually See
Presentation varies wildly based on severity. Look for a declining Glasgow Coma Scale (GCS) score, confusion, combativeness, or specific signs like Battle’s sign (bruising behind the ear) or raccoon eyes. Be wary of the “lucid interval,” where a patient with an epidural hematoma is initially awake and talking before rapidly deteriorating.
“Patient has a large laceration to the forehead but is currently A&O x4. GCS is 15, but there was a reported loss of consciousness. Given the mechanism and mechanism of injury, I’m advising transport to the trauma center for a CT scan due to risk of intracranial bleed.”
Common Pitfall & Pro Tip
⚠️ Pitfall: Being reassured by a “normal” initial set of vitals or a patient who feels “fine.” A TBI patient can deteriorate rapidly as intracranial pressure rises.
💡 Pro Tip: Treat the mechanism, not just the symptoms. If the force was enough to crack a windshield or cause a fall over 5 feet, assume significant TBI until proven otherwise. Perform serial neurological assessments every 5 minutes during transport to catch changes early.
Memory Aid for TBI
Use the “Egg Analogy”:
- Shell: The Skull (hard, protective)
- White/Yolk: The Brain (soft, delicate)
- Water: Cerebrospinal Fluid (cushioning)
If you shake a raw egg hard, the shell might not break, but the yolk inside is scrambled. This explains why patients can have severe internal brain damage without any external signs of head trauma.
NREMT Connection
TBI is a core component of the trauma section. You will likely be tested on calculating GCS, recognizing signs of increased intracranial pressure (like Cushing’s Triad), and understanding the importance of hyperventilation (only in herniation) and maintaining adequate cerebral perfusion.
Related Concepts
A TBI often leads to increased intracranial pressure (ICP), which restricts blood flow to the brain. If untreated, this pressure can force brain tissue through the brainstem, causing herniation syndrome—a rapidly fatal condition. You should also assess for basilar skull fractures, which present with cerebrospinal fluid leaking from the ears or nose.
Quick Reference
✓ Key vitals/values: GCS trending down is a red flag
✓ Priority level: Emergent (if GCS < 9 or deteriorating)
✓ Treatment considerations: • Maintain Spinal immobilization if indicated • Ensure PaO2 > 94% (prevent hypoxia) • Maintain Systolic BP > 90-100 mmHg (prevent hypotension) • Elevate head of bed 30° (if no spinal injury) • Rapid transport to Trauma Center
The bottom line? Treat the mechanism, trust your gut, and never let a “walking and talking” patient fool you into missing a life-threatening bleed.