Platelets or Fibrinogen as First-line Treatment for Bleeding During Pedatric Heart Surgery

Inclusion Criteria: * Children \< 1 years of age, scheduled for open surgery of congenital heart defects, using cardiopulmonary bypass. * Body weight \< 10 kg. * Expected CPB time \> 90 minutes. Exclusion Criteria: * Known coagulation disorder, current treatment with antiplatelet and/or anticoagulant drugs, major surgery the past month before the planned surgery, preoperative kidney or liver failure (defined as creatinine and/or transaminases \> normal interval for the patient´s age), gestational age \< 34 weeks.