https://www.ncbi.nlm.nih.gov/pubmed/6162412
Pathophysiology of the burn wound. Arturson G. Abstract The pathophysiology of the burn wound is characterized by an inflammatory reaction leading to rapid oedema formation, due to increased microvascular permeability, vasodilation and increased extravascular osmotic activity. These reactions are due to the direct heat effect on the microvasculature and to chemical mediators of inflammation. The earliest stage of vasodilatation and increased venous permeability is commonly due to histamine release. Damage to the cell membranes partly caused by oxygen-free radicals released from polymorphonuclear leucocytes would activate the enzymes catalyzing the hydrolysis of prostaglandin precursor (arachidonic acid) with rapid formation of prostaglandin as the result. Prostaglandins inhibit the release of norepinephrine and may thus be of importance in modulating the adrenergic nervous system which is activated in response to thermal injury. The morphological interpretations of the changes in the functional ultrastructure of the bloodlymph barrier following thermal injury seem to be an increase in the numbers of vacuoles and many open endothelial intercellular junctions. Furthermore changes of the interstitial tissue after burn trauma are of great importance. The continuous loss of fluid from the blood circulation within the thermally damaged tissue causes increased haematocrit levels and a rapid fall in plasma volume, with decreased cardiac output and hypoperfusion on the cellular level. If the fluids are not adequately restored burn shock develops. Furthermore, the burn wound provides a vast area of entry of surface infection with a high risk of septic shock. Four main principles are of utmost importance in the current management of patients with severe thermal injury, namely early wound closure, prevention of septic complications, adequate nutrition and control of the external environment.
According to FA, stimulation of the H1 receptor results in "nasal and bronchial mucus production, vascular permeability, bronchoconstriction, pruritus, pain" (page 284 of FA 2018).
Mast cell degranulation can be triggered by foreign antigens and trauma
@thomasalterman you are right. I don't why you got downvoted. In UW QID# 17853 it's the same exact scenario. And this is what they said "the morphologic changes in burns occur due to both direct tissue damage and inflammatory mediators released from epidermal and immune cells. Release of histamine and other preformed vasoactive mediators from MAST CELLS in the minutes following a burn leads to dilation of superficial skin capillaries."
submitted by โtemmy(152)
Dr Sattar talks about increase capillary permeability in the postcapillary venules and vasodilation in the arterioles as actions of histamine. That was what i thought of when i answered the questions.