The occurrence of acute antibody-mediated rejection (AMR), especially in more severe cases, continues to be associated with a poor prognosis for implant survival. Here, we have reported the results of treatment of two patients who developed AMR associated with thrombotic microangiopathy immediately after transplantation. We used a single dose of eculizumab at an early stage jointly with conventional modalities of steroid boluses, plasmapheresis, intravenous immunoglobulin, and rituximab. In both cases, the clinical course was favorable. Eculizumab, a monoclonal antibody with a high affinity for complement protein C5, prevents generation of the final membrane attack complex, blocking this cascade. To date, there are a few reports of the usefulness of eculizumab in AMR. Eculizumab can help to stop endothelial damage, especially in severe cases that show a risk of progression to cortical necrosis, by providing a therapeutic window until the other modalities begin to control the immune response. In our experience, the use of eculizumab can be beneficial in the treatment of AMR.
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