The crystalloids solutions are generally the first line of therapy in replacing volume deficit while colloids solutions are more effective to maintain plasma colloid osmotic pressure and to prove more prolonged period of homeostasis after the initial resuscitation. Decisions for blood and blood component transfusion must be based on considerations of the patient's blood volume, preoperative hematocrit, general medical condition, the nature of the surgical procedure, and the risk versus benefits of transfusion.