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We evaluated the efficacy of activated recombinant factor VIIa (rFVIIa) administration for critical bleeding during cardiothoracic surgery in Iceland. ⋯ rFVIIa can be used effectively to stop intractable bleedings in open heart surgery, with 8 out of 11 patients in this small series achieving hemostasis after its administration. Mortality in this group of patients was high (50%), however, in all cases rFVIIa was used as an end-of-the-line treatment where other therapy had failed. One patient died from pulmonary embolism and cerebral infarct, raising the question of hypercoagulation. Further studies on the side effects and indications of rFVIIa treatment are necessary.