Measurements of cardiac output, blood volume, plasma renin activity (PRA), serum aldosterone, plasma and urinary catecholamine levels, serum and urinary electrolyte levels, and of transfusion and fluid therapy have been made in eight hypertensive and seven normotensive burned children. Studies were conducted during the acute phase of burn injury when hypertension was first diagnosed and were repeated just before discharge from the hospital. Hypertensive patients perfused at an inappropriately high total peripheral resistance and hypervolemia was demonstrated in the hypertensive patients. No differences could be demonstrated between hypertensive or normotensive patients in PRA, aldosterone, catecholamine, or electrolyte levels. These data indicate that both the hypervolemia and the vasoconstrictor activity of PRA and/or catecholamines are present when hypertension develops in these patients. These data suggest that the renin-angiotension-aldosterone system is directly stimulated as part of the neuroendocrine response to trauma.
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