ROTEM monitoring will be performed in patients with signs of clinically relevant diffuse bleeding and in whom blood transfusion is considered (Temp >35 Celsius degrees; pH lower than 7.2; Cai above 4.6 mg/dL; Hb below 9g/dL, or below 10g/dL with anticipated greater blood loss) or at a fixed range every 2 hours or at Anesthesiologist criteria based on patient's clinical situation.