Emergency Medicine Hub / Trauma & Orthopedics • 3 min read • 3 sections

Spinal Trauma, Incomplete Cord Syndromes & Neurogenic Shock

Systematic emergency management of blunt and penetrating spinal trauma: clinical decision rules (NEXUS vs. Canadian C-Spine), unstable cervical and thoracolumbar fracture patterns, differentiation of incomplete spinal cord injury syndromes, and the hemodynamics of neurogenic vs. spinal shock.

Resuscitation Quick Actions • First 2 Minutes

High-Acuity

C-Spine Clearance

NEXUS criteria (no midline tenderness, no focal neurologic deficit, normal alertness, no intoxication, no painful distracting injury). If all 5 met -> clinically clear without imaging.

Canadian C-Spine Rule

High-risk factors (age >=65, dangerous mechanism, paresthesias in extremities) -> imaging mandatory. Low-risk factors allow assessment of 45° active neck rotation.

Unstable Cervical Fractures

Jefferson (burst fracture of C1 atlas ring), Hangman (traumatic spondylolisthesis of C2 pars interarticularis from hyperextension), Odontoid Type II (dens base fracture, high non-union rate), Flexion Tear-drop (hyperflexion, anterior body fracture with retroflexion into canal; highly unstable with anterior cord syndrome).

Stable Cervical Fracture

Clay-shoveler (avulsion of C6-T1 spinous process from forceful muscular contraction, neurologically intact).

Thoracolumbar Seatbelt Injury

Chance fracture (horizontal flexion-distraction fracture slicing through all three spinal columns); 50% associated with intra-abdominal hollow viscus or solid organ rupture.

Neurogenic Shock vs Spinal Shock

Neurogenic shock = hemodynamic collapse (hypotension + bradycardia); Spinal shock = temporary neurological flaccidity and loss of all reflexes below the level of the lesion (resolves with return of bulbocavernosus reflex).

Brown-Séquard Syndrome

Spinal cord hemisection causing ipsilateral motor loss and dorsal column proprioception loss, with contralateral spinothalamic pain/temperature loss.

Bottom-Line Clinical Pearl

Neurogenic shock is a true distributive shock caused by disruption of sympathetic autonomic pathways (T1-L2), characterized by hypotension with PARADOXICAL bradycardia and warm, dry skin. Treat with Norepinephrine to maintain MAP 85-90 mmHg for 7 days to preserve spinal cord perfusion. Central cord syndrome (upper > lower weakness) is the most common incomplete cord injury.

CRITICAL RESUSCITATION: Perfusion Pressure Goals in Acute Spinal Cord Injury

Hypotension severely compounds ischemic secondary injury in damaged spinal cord tissue. Guidelines (AANS/CNS) mandate maintaining a Mean Arterial Pressure (MAP) of 85 to 90 mmHg for the first 7 days following acute spinal cord injury. Fluid resuscitation alone is insufficient; initiate Norepinephrine or Phenylephrine early to counteract loss of vascular tone.

Incomplete Spinal Cord Injury Syndromes

Syndrome	Mechanism/Vascular Culprit	Motor Deficits	Sensory Deficits	Prognosis
Central Cord Syndrome (Most Common)	Cervical hyperextension injury in older adults with preexisting cervical spondylosis	Marked upper extremity motor weakness > lower extremity (hands/arms disproportionately paralyzed due to medial corticospinal tract laminations)	Variable; patchy sensory loss in upper extremities; burning dysesthesias in hands	Moderate (50-75% regain some ambulatory function; hand dexterity often permanently impaired)
Anterior Cord Syndrome	Hyperflexion injury or occlusion/ischemia of the anterior spinal artery (ASA)	Complete bilateral paraplegia or quadriplegia below lesion (corticospinal tract destruction)	Complete loss of pain and temperature sensation below lesion (spinothalamic tracts); Dorsal column vibration and proprioception are preserved	Poor (worst prognosis of incomplete syndromes; <10-20% functional recovery)
Brown-Séquard Syndrome	Penetrating trauma (stab wound) or lateral mass fracture causing spinal cord hemisection	Ipsilateral flaccid motor paralysis below lesion (lateral corticospinal tract)	Ipsilateral loss of vibration, proprioception, and light touch (dorsal column) PLUS Contralateral loss of pain and temperature sensation 1-2 dermatomes below lesion (spinothalamic tract)	Favorable (best prognosis; 75-90% regain bowel/bladder control and independent ambulation)
Posterior Cord Syndrome (Rare)	Direct posterior contusion, hyperextension, or posterior spinal artery infarct	Motor function typically preserved	Bilateral loss of proprioception and vibratory sense; sensory ataxia (positive Romberg)	Variable; severe gait disability from loss of proprioception

Neurogenic Shock vs. Spinal Shock Differentiation

Neurogenic Shock (Hemodynamic Entity): Due to sudden interruption of descending sympathetic pathways in cervical or high thoracic cord (above T6). Loss of sympathetic tone results in severe peripheral vasodilation (hypotension, warm pink skin, normal capillary refill) and loss of cardiac accelerator fibers (T1-T4), producing paradoxical bradycardia or inability to mount a compensatory tachycardia. Resuscitate with isotonic crystalloids followed promptly by vasopressors (Norepinephrine or Dopamine) to restore vascular resistance and heart rate.
Spinal Shock (Neurologic Entity): Physiological, not hemodynamic. A transient state of total physiological transection characterized by flaccid paralysis, absent sensation, and complete loss of all spinal reflexes below the lesion (including bladder/bowel tone). Typically lasts days to weeks. The return of the bulbocavernosus reflex (anal sphincter contraction upon squeezing the glans penis or tugging the Foley catheter) signals the end of spinal shock.

Clinical Pitfalls

Assuming bradycardia and hypotension in trauma is always neurogenic shock: A patient with spinal cord injury can also be exsanguinating internally from splenic rupture or pelvic fracture; rule out hemorrhagic shock before attributing hypotension solely to neurogenic shock!
Relying on methylprednisolone: High-dose steroids (NASCIS protocol) are NO LONGER recommended as standard of care in acute spinal cord trauma due to increased risk of sepsis, GI hemorrhage, and wound complications without proven long-term functional recovery.

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