The study encountered unexpected difficulties in enrolling patients due to requirements for the Informed Consent. 60% of our patients comes from abroad with only one accompanying parent. The rules of our EC require both parents to sign the consent.

In pediatric patients (newborns and infants weighing less than 10 kg) undergoing cardiac surgery with extracorporeal circulation postoperative bleeding represents a known complication with a significant impact on outcome. Fresh frozen plasma (FFP) for bleeding management is associated, particularly in this kind of patients, to volume overload and a significative increase of Transfusion Related Acute Lung Injury (TRALI), further worsening the postoperative outcome. In the adult patient FFP employment could be almost completely canceled by administration of concentrated hemostatic components - the fibrinogen concentrate and prothrombin complex concentrate (PCC). We designed this phase II pilot study to establish whether an analogous strategy, modified accordingly to pediatric physiology, could be safely and successfully applied in newborns and infants.

The study population will be randomized to two groups: ZEPLAST and control, respectively.

The two groups will receive the same priming solution (containing Red Blood Cells and albumin 5%) and heparin/protamine management. In both groups coagulation will be assessed with rotational thromboelastometry (ROTEM - EXTEM, INTEM, HEPTEM and FIBTEM tests) after heparin antagonization. In case of bleeding, coagulopathies will be treated differently:

• in the ZEPLAST group, fibrinogen deficiency (FIBTEM Maximum Clot Firmness MCF < 8 mm) will be treated with 30 mg/kg of concentrated fibrinogen; low thrombin generation (EXTEM Clotting Time CT > 100 s) will be treated with 20 mg/kg of prothrombin complex concentrate;
• in the control group, coagulopathies will be treated with 10-20 ml/kg of FFP. In case of refractory bleeding, PCC and fibrinogen can be administered as a rescue treatment.

Further ROTEM tests will be performed at 24 and 48 hours post surgery. Outcome parameters will be collected at the same timepoints.

Inclusion Criteria:

• newborns and infants with weight lower than 10 kg undergoing cardiac surgery with extracorporeal circulation:
• informed consent signed by both parents or legal guardian.

Exclusion Criteria:

• emergency surgery;
• known congenital coagulopathy or suspected based on anamnesis;
• participation to other clinical trials;
• known hypersensitivity to components and excipients of FFP , prothrombin complex concentrate or fibrinogen concentrate.