This document discusses fluid imbalance and its management. It notes that fluid input and output should be equal and that imbalances can result from gastrointestinal, renal, skin or third-space losses. Clinical manifestations of fluid loss include symptoms related to dehydration and electrolyte disturbances. Fluid imbalance is managed through maintenance fluids to replace ongoing losses and replacement fluids to correct existing deficits, with the choice and rate of fluids dependent on factors like the patient's volume status and electrolyte levels.