After a burn injury, the patient usualy goes into hypovolemia (rapid loss in blood or bodily fluids because of severe bleeding from injury) this results in hypoperfusion (low blood flow), therefore fluid resuscitation is required in order to replace the lost fluids.
Ringers lactate is generally used because it helps to replace fluids and electrolytes in order increase the blood pressure, it is also used because the by-products of lactate metabolism in the liver counteract the acidosis, which is a chemical imbalance that occurs with acute loss of fluid or kidney failure
