This document discusses fluid resuscitation and cautions regarding the use of 0.9% saline and Hartmann's solution. It notes that 0.9% saline can cause hyperchloremic acidosis and does not contain potassium. Hartmann's solution contains lactate and potassium but carries a risk of hyponatremia. The document also addresses signs of adequate resuscitation including warmth, wakefulness, and normalization of lactate levels without acidosis.