ITLS Head and Spinal Trauma 2 — Questions and Answers

Question 1: A patient struck in the head with a baseball bat initially loses consciousness, then regains awareness and appears lucid for 30 minutes before rapidly deteriorating. What type of intracranial hemorrhage is most likely?

Subdural hematoma
Epidural hematoma (Correct answer)
Subarachnoid hemorrhage
Intracerebral hemorrhage

Correct answer: Epidural hematoma

An epidural hematoma, typically from tearing of the middle meningeal artery by a temporal bone fracture, classically presents with a 'lucid interval' followed by rapid neurological decline as the arterial bleed expands.

Epidural hematomas account for about 2% of head injuries but are among the most surgically urgent. The middle meningeal artery, running in a groove along the inner surface of the temporal bone, is torn when a fracture crosses this groove. The classic presentation follows three phases: initial loss of consciousness from the impact, a lucid interval (minutes to hours) as the patient recovers while the arterial bleed slowly separates the dura from the skull, then rapid deterioration with ipsilateral pupil dilation (uncal herniation compressing CN III), contralateral hemiparesis, and progression to coma and death if untreated. The lucid interval occurs because the initial brain injury is often minimal—the danger is the expanding mass effect. Subdural hematomas are venous, develop more slowly, and rarely have a clear lucid interval. This is a neurosurgical emergency requiring craniotomy and hematoma evacuation, with excellent outcomes if treated before brainstem herniation.

Question 2: What clinical signs indicate Cushing's triad, and what does it signify?

Tachycardia, hypotension, and tachypnea indicating hemorrhagic shock
Hypertension, bradycardia, and irregular respirations indicating critically elevated intracranial pressure (Correct answer)
Fever, neck rigidity, and altered mental status indicating meningitis
JVD, muffled heart sounds, and hypotension indicating cardiac tamponade

Correct answer: Hypertension, bradycardia, and irregular respirations indicating critically elevated intracranial pressure

Cushing's triad (hypertension, bradycardia, irregular respirations) is a late and ominous sign of critically elevated ICP with impending brainstem herniation, requiring immediate intervention.

Cushing's response is a physiological reflex triggered when rising ICP threatens to exceed cerebral perfusion pressure. The brainstem's vasomotor center responds by dramatically increasing systemic blood pressure (hypertension with widened pulse pressure) to force blood through the compressed cerebral vasculature. Baroreceptors detect the hypertension and trigger a vagal reflex, producing bradycardia. As the brainstem itself becomes compressed, respiratory centers dysfunction, producing irregular breathing patterns (Cheyne-Stokes, ataxic, or apneustic breathing). By the time the full triad is present, brainstem herniation is imminent or occurring. ITLS management includes: controlled hyperventilation (brief, to EtCO2 of 30-35), elevating the head of bed 30 degrees if spine injury is excluded, osmotic therapy (mannitol or hypertonic saline), and emergent transport to neurosurgical care. Cushing's triad is a pre-terminal sign—it means the brain is running out of compensatory space.

Question 3: A trauma patient has unequal pupils—the right pupil is fixed and dilated while the left is reactive. What does this finding most likely indicate?

Direct trauma to the right eye
Right-sided uncal herniation compressing the right oculomotor nerve (Correct answer)
Left-sided brain injury with contralateral effect
Normal pupillary variation

Correct answer: Right-sided uncal herniation compressing the right oculomotor nerve

A unilateral fixed, dilated pupil in a trauma patient indicates ipsilateral uncal herniation, where the medial temporal lobe herniates through the tentorial notch and compresses the ipsilateral CN III (oculomotor nerve).

Uncal herniation is one of the most immediately dangerous consequences of expanding intracranial mass lesions. As ICP rises on one side (from epidural hematoma, subdural hematoma, or cerebral edema), the uncus (medial temporal lobe) is pushed medially and inferiorly through the tentorial notch. The ipsilateral oculomotor nerve (CN III) runs along the tentorial edge and is compressed first, causing progressive pupillary dilation (parasympathetic fibers run on the outside of CN III and are compressed first). The progression is: sluggish pupillary response → fixed, dilated pupil → ipsilateral oculomotor palsy → contralateral hemiparesis (compression of the ipsilateral cerebral peduncle) → bilateral fixed pupils → death. This is a neurosurgical emergency. ITLS providers should note the time of pupil change, maintain CPP (avoid hypotension, provide osmotic therapy), and transport immediately. Direct eye trauma typically causes an irregular, not perfectly dilated, pupil and has associated periorbital findings.

Question 4: A motorcycle crash victim has weakness and loss of pain/temperature sensation in both arms but relatively preserved leg function. What spinal cord injury pattern is this?

Anterior cord syndrome
Central cord syndrome (Correct answer)
Brown-Séquard syndrome
Complete spinal cord transection

Correct answer: Central cord syndrome

Central cord syndrome involves greater motor impairment in the upper extremities than the lower, with variable sensory loss. It occurs from cervical hyperextension that damages the central portion of the spinal cord where upper extremity fibers are located.

Central cord syndrome is the most common incomplete spinal cord injury, frequently occurring in elderly patients with cervical spondylosis after hyperextension injuries but also in younger patients from high-energy mechanisms. The spinal cord has a somatotopic organization: the corticospinal tracts arrange fibers with cervical (arm) fibers located more centrally and sacral (leg) fibers more peripherally. Hyperextension causes compression of the central cord by infolding of the ligamentum flavum posteriorly and osteophytes anteriorly, preferentially damaging the central fibers. The result is upper extremity weakness greater than lower extremity weakness (classic 'man-in-a-barrel' pattern), variable sensory loss, and possible bladder dysfunction. Anterior cord syndrome affects motor and pain/temperature below the level but preserves posterior column function (proprioception). Brown-Séquard involves ipsilateral motor loss and contralateral pain/temperature loss from a hemisection. The prognosis for central cord syndrome is relatively favorable, with most patients recovering some function.

Question 5: What is the appropriate blood pressure target when managing a trauma patient with both a severe traumatic brain injury (GCS 6) and hemorrhagic shock?

Allow permissive hypotension to protect the clots
Maintain systolic BP above 90 mmHg to protect cerebral perfusion, even though this conflicts with permissive hypotension strategy (Correct answer)
Target systolic BP of 60-70 mmHg
Blood pressure management is not important in polytrauma

Correct answer: Maintain systolic BP above 90 mmHg to protect cerebral perfusion, even though this conflicts with permissive hypotension strategy

TBI patients require adequate cerebral perfusion pressure, making hypotension particularly dangerous. When TBI coexists with hemorrhagic shock, maintaining systolic BP above 90 mmHg takes priority over permissive hypotension to prevent secondary brain injury.

This scenario presents a classic dilemma in polytrauma management. Permissive hypotension (SBP 80-90) is beneficial for uncontrolled hemorrhage by reducing clot disruption, but TBI outcomes dramatically worsen with even single episodes of hypotension (SBP <90). A single hypotensive episode doubles TBI mortality. The injured brain loses autoregulation and becomes dependent on systemic blood pressure for perfusion. ITLS resolves this conflict by prioritizing cerebral perfusion: target SBP ≥90 mmHg (some guidelines now recommend ≥100 mmHg for severe TBI). Crystalloid boluses maintain the target while attempting hemorrhage control (tourniquets, pelvic binder). Blood products, when available prehospital, provide volume without diluting clotting factors. Maintain PaO2 >60 mmHg and avoid hyperventilation (which reduces cerebral blood flow). This balanced approach accepts the hemorrhage trade-off because secondary brain injury from hypotension is often more devastating than increased bleeding.

Question 6: A patient with a suspected cervical spine injury is vomiting while secured to a backboard. What is the immediate management?

Suction the airway while keeping the patient supine
Tilt the entire backboard to the side as a unit while suctioning (Correct answer)
Remove the cervical collar and turn only the head
Sit the patient upright on the backboard

Correct answer: Tilt the entire backboard to the side as a unit while suctioning

Tilting the entire backboard with the patient as a unit (log-roll on the board) allows drainage of vomitus while maintaining spinal alignment. Aspiration is immediately life-threatening and takes priority.

Vomiting while immobilized supine on a backboard creates an immediate aspiration risk. The entire backboard is tilted laterally (typically to the patient's left side) as one unit, maintaining spinal alignment while allowing vomitus to drain from the mouth by gravity. Simultaneously, aggressive suctioning with a rigid-tip catheter clears residual material. Suction alone in the supine position may be insufficient for copious vomitus, and aspiration of gastric contents can cause chemical pneumonitis and rapid respiratory failure. Turning only the head is absolutely contraindicated as it creates cervical rotation. Sitting upright changes spinal alignment. The backboard tilt maneuver requires coordination—ideally one provider at the head maintaining inline stabilization while others tilt the board. Once the airway is clear, the board is returned to supine. Prevention includes placing a suction unit within immediate reach of any immobilized patient and considering prophylactic lateral tilt for patients at high aspiration risk.

ITLS Head and Spinal Trauma 2

A patient struck in the head with a baseball bat initially loses consciousness, then regains awareness and appears lucid for 30 minutes before rapidly deteriorating.
What type of intracranial hemorrhage is most likely?