Neurogenic shock

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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1] Associate Editor-In-Chief: Ayan Sen, M.D, Henry Ford Hospital, Detroit MI, USA


Neurogenic shock is shock caused by the sudden loss of the sympathetic nervous system signals to the smooth muscle in vessel walls. This can result from severe central nervous system (brain and spinal cord) damage. With the sudden loss of background sympathetic stimulation, the vessels suddenly relax resulting in a sudden decrease in peripheral vascular resistance and decreased blood pressure.


  1. Spinal cord injury / Ischemia
  2. Regional Anesthesia
  3. Drugs
  4. Neurological Disorders

History and Symptoms

The classic presentation of a patient in neurogenic shock is almost the opposite to that found in other shock states. In hypovolaemic shock the patient presents with cold, clammy, and pale or cyanotic peripheries. In neurogenic shock, the extremities may remain pink, warm and well perfused. Due to the loss of sympathetic function, he is unable to initiate the vasoconstriction required to divert blood to the central vital organs; and thus it pools in the peripheral vascular compartments.

Similarly, a hypovolaemic patient typically presents with tachycardia and hypotension; the increased heart rate represents an early and sustained attempt to support the failing circulation, and maintain central perfusion. In neurogenic shock, the cardiovascular system cannot stimulate compensatory changes in the same way; and thus the patient may present with a normal heart rate. As vital signs and physical assessment do not indicate shock, this factor may also mask other underlying causes of the shock state, such as hypovolemia.

Symptoms of neurogenic shock may include:


Medical Therapy


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