Neurogenic vs Hemorrhagic Shock

Why this matters

Textbooks show a warm, dry, slow patient after a high spinal cord injury. Real scenes are mixed. In trauma, hemorrhagic shock is still the default. Expect cool, pale skin and a fast heart rate, unless a drug or a dying heart is hiding the rate.

Neurogenic shock is usually a cervical or high-thoracic cord injury that loses sympathetic tone. Those nerves squeeze blood vessels and speed the heart. Blood pressure is low. The heart rate is slow, or it is not as fast as the pressure drop should produce. Skin below the injury can be warm and dry.

First, stop bleeding you can see. Then read the skin and the heart rate. Check the abdomen, pelvis, long bones, back, and the scene for blood. Do not call a bleeding pelvis neurogenic because a collar is on. Do not give a large fluid bolus to an isolated cord injury as if the only problem were blood loss.

Clinical sequence

1. Run MARCH: massive hemorrhage, airway, respirations, circulation, then hypothermia and head injury. Stop obvious bleeding. Open the airway. Ask whether this is tension. Then look at the blood pressure and the heart rate.
2. If the patient is hypotensive and slow after a likely high cord injury, treat neurogenic shock as possible and still look for blood. Do not rock the pelvis. Use a binder only if your protocol includes one. A binder does not replace the search for blood.
3. Give fluids and vasopressors only as your protocol allows. Isolated neurogenic shock may need vessel tone more than volume. Hemorrhage needs blood, if you carry it, and a surgeon. You may not be sure on scene.
4. Go to a trauma center. Name both possibilities in the handoff.

Teaching points

• Hemorrhagic shock is low volume. Expect a fast heart rate unless the patient takes a beta-blocker, is dying, or also has a spinal injury. Skin is cool and clammy. The pulse pressure is narrow. Find the blood.
• Neurogenic shock is lost sympathetic tone, usually above about the sixth thoracic vertebra. Expect low blood pressure, a slow rate or a rate that is not as fast as it should be, and warm dry skin below the injury. You may see priapism, a persistent erection from the cord injury. The limbs may be floppy, with no reflexes. Make this diagnosis only after you have looked for bleeding.
• Spinal shock and neurogenic shock are different. Spinal shock is a temporary loss of cord function. The limbs are floppy, and reflexes are gone. Neurogenic shock is the blood-pressure problem from lost sympathetic tone. Do not use the two names as synonyms on the radio.
• Do not withhold hemorrhage control because the heart rate is 60. Beta-blockers and dying patients who are bleeding can be slow too.
• Target pressure, fluids, and atropine belong to your protocol and medical direction. This site does not list milligrams. Isolated neurogenic shock is a problem of vessel tone. More volume is not always the whole fix.

Common errors

• Calling it spinal shock so you skip the search for blood, or treating a binder as a substitute for finding the bleed.
• Calling every low trauma blood pressure neurogenic.
• Confusing spinal shock, which is an exam finding, with neurogenic shock, which is the blood-pressure problem.
• Letting the patient get cold while you debate the label.

Practice

Related: Shock Categories, Hidden Hemorrhagic Shock, Pelvic Binder Thinking.

Sources & Further Study

Named guidelines for further study. They are not clinical orders and do not replace your protocol or medical direction.

• NASEMSO National Model EMS Clinical Guidelines (2022) — U.S. EMS model language; your protocol decides
• NASEMSO 2022 — shock and spinal injury language — hemorrhage control remains first; protocol owns fluids and vasopressors
• ACS COT trauma education — hypotension in trauma is hemorrhage until you have a reason it is not
• AHA 2025 Part 9: Adult ALS — hypovolemia and other reversible causes remain different problems