- Patients with significant uncontrolled acute bleeding, defined as hemorrhage requiring > 15 cc/kg of packed red blood cells (ie. a pediatric patient weighing 20 kg and requiring > 300cc of packed red blood cells /24 hours or an adult patient weighing 70 kg and requiring >3 units of packed red blood cells/24 hours) to replace blood loss are excluded. These parameters must be reviewed prior to enrollment by the PI or his/her designate.