Fatal Cyclophosphamide-Induced Congestive Heart Failure in a 10-Year-Old Boy with Shwachman-Diamond Syndrome and Severe Bone Marrow Failure Treated with Allogeneic Bone Marrow Transplantation

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Abstract
A 10-year-old boy with Shwachman-Diamond syndrome and severe bone marrow failure was treated with high-dose cyclophosphamide, busulfan, and antithymocyte globulin followed by an infusion of human leukocyte antigen-identical, mixed lymphocyte culture (MLC) non-reactive sibling bone marrow. He developed cardiac arrhythmias and intractable hypotension and died on day 23 posttransplant. Autopsy findings were consistent with cyclophosphamide-induced pancarditis. The bone marrow showed signs of early engraftment. Allogeneic bone marrow transplantation may be a treatment alternative for Shwachman-Diamond syndrome with severe bone marrow failure. However, fatal posttransplant pancarditis due to doses of cyclophosphamide not usually associated with cardiac death may be an unanticipated problem. Further trials of bone marrow transplantation as therapy for this syndrome may be warranted, perhaps using lower doses of cyclophosphamide or substituting for it other immunosuppressive and myelosuppressive agents.

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