In patients with extensive burns, edema occurs in both burned and unburned areas because of:
a. catecholamine-induced vasoconstriction.
b. decreased glomerular filtration.
c. increased capillary permeability.
d. loss of integument barrier.
C
Capillary permeability is altered in burns beyond the area of tissue damage, resulting in significant shift of proteins, fluid, and electrolytes resulting in edema (third spacing). Catecholamine-induced vasoconstriction does not produce edema. Decreased glomerular filtration may cause fluid retention, but it is not responsible for the extensive edema seen after burn injury. Loss of integument barrier does not cause edema.
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