A 25-year-old man with factor IX deficiency had an aortic and mitral valve replacement using a 2M Starr Edwards valve in the mitral position and a 22 Medtronic valve in the aortic position under cover of factor IX concentrate. The surgical procedure and the immediate postoperative period were uneventful except for a pericardial effusion which required a pericardiostomy. He was anticoagulated with heparin in the immediate postoperative period while the factor IX concentrate was being administered. Oral anticoagulation with acenocoumarol (Acitrom®) was started, maintaining the international normalized ratio between 1.5 and 2. He was doing well at follow-up 9 months later.
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