Which assessment is most beneficial in differentiating hemorrhagic shock from neurogenic shock in the prehospital setting?

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Differentiating hemorrhagic shock from neurogenic shock in the field hinges on how the skin reflects underlying vascular tone. Hemorrhagic shock from blood loss triggers a sympathetic response that constricts peripheral vessels, so the skin becomes cool, pale, and clammy. Neurogenic shock, due to loss of sympathetic tone from spinal injury, causes peripheral vasodilation, leading to warm or even flushed, dry skin. In the prehospital setting, blood pressure and neurologic status can be unreliable or nonspecific early on, and abdominal findings or neurological impairment from trauma can muddy the picture, but the skin pattern provides a consistent clue to the type of shock. Therefore, assessing skin is the most helpful single indicator to differentiate these shock states.