As part of the general stress response, catecholamines are released after a burn injury. Their main deleterious effect is to cause vasoconstriction, so potentially limiting perfusion to the zone of stasis. However, vasoconstriction also occurs in non-burned skin, muscle and viscera and this may act to shunt perfusion to the burn.
Also, catecholamines act to increase cardiac output to counter any increase in systemic vascular resistance.
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