The case is presented of a 10-year-old boy with severe Haemophilia A, in whom standard therapy led to the development of an inhibitor to factor VIII. Immunological tolerance induction (ITI) did not yield the expected result, and inhibitor titers were not reduced. Due to numerous recurrent bleeds, prophylaxis with activated prothrombin complex concentrate (aPCC) was initiated, with recombinant factor VIIa administered in the case of bleeding episodes. Despite second and third-line ITI treatments, desired outcomes were not achieved, leading to therapy discontinuation and initiation of emicizumab treatment. The new therapy significantly reduced bleeding occurrences.

This case clearly illustrates the greater efficacy of emicizumab compared to other drugs, confirming its application in patients with developed factor VIII inhibitors where ITI therapy was ineffective. Prophylaxis with this antibody significantly reduces bleeding frequency and improves the patient’s quality of life.

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