“…Some patients may require more, or less, fluid and should be clinically evaluated based on heart rate, blood pressure, oxygen saturation, urine output, capillary refill, appearance of skin mottling, etc. [14,15]. Crystalloid fluid may be given in 500 mL challenges adding up to an initial resuscitation of 20-30 mL kg −1 , measuring responsiveness by an increase in stroke volume [15,16].…”