title: A fatal case of transplantation-mediated alloimmune thrombocytopenia following liver transplantation.
abstract: OBJECTIVE
  Transplantation-mediated alloimmune thrombocytopenia (TMAT) occurs when leukocytes transferred in a donor organ from a patient with immune thrombocytopenia (ITP), mount a response against recipient platelets. We present the first fatal case of TMAT following liver transplantation and review its aetiology and treatment.
  
  
  METHODS
  The liver donor had ITP and died from an intracranial haemorrhage. The recipient platelet count fell to 2 × 109/l on post-operative day 2. Treatment refractory thrombocytopenia resulted in pulmonary haemorrhage and death. TMAT did not occur in a kidney recipient from the same ITP donor.
  
  
  METHODS
  Extramedullary haematopoiesis was identified in the donor liver biopsy. Antibodies against platelet GPIb/IX were demonstrated in both donor and recipient. The thrombocytopenia was refractory to platelet transfusions, intravenous immunoglobulin, methylprednisolone, rituximab, romiplostim, plasmapheresis, vincristine and splenic artery embolization. On review of the literature, severe thrombocytopenia (<10 × 109/l) has started within 3 days of transplantation in all reported TMAT cases. Serious non-fatal bleeding was observed in 3/5 previously reported cases. The optimal treatment is unclear. TMAT should resolve as donor lymphocytes are eliminated but re-transplantation may be required in severe refractory cases. TMAT has been reported in recipients of a liver but not kidney or heart transplant from ITP donors, probably because of the greater burden of co-transplanted lymphoid tissue.
  
  
  CONCLUSIONS
  Before using the liver of an ITP donor, the recipient's fully informed consent is required. However, the risk of TMAT from an ITP donor is currently unknown and systematic review of donor registries is needed.
authors.affiliation: a Department of Haematology , St James's University Hospital , Leeds , UK.
authors.forename: Q A
authors.initials: QA
authors.lastname: Hill
authors.affiliation: b Department of Hepatology , St James's University Hospital , Leeds , UK.
authors.forename: L C
authors.initials: LC
authors.lastname: Harrison
authors.affiliation: c Department of Anaesthesia & Intensive Care Medicine , St James's University Hospital , Leeds , UK.
authors.forename: A D
authors.initials: AD
authors.lastname: Padmakumar
authors.affiliation: d HMDS Laboratory and Department of Haematology , St James's University Hospital , Leeds , UK.
authors.forename: R G
authors.initials: RG
authors.lastname: Owen
authors.affiliation: e Department of Transplant and Hepatobiliary Surgery , St James's University Hospital , Leeds , UK.
authors.forename: K R
authors.initials: KR
authors.lastname: Prasad
authors.affiliation: f Histocompatibility & Immunogenetics Laboratory , NHS Blood and Transplant , North Bristol Park, Bristol , UK.
authors.forename: G F
authors.initials: GF
authors.lastname: Lucas
authors.affiliation: b Department of Hepatology , St James's University Hospital , Leeds , UK.
authors.forename: P
authors.initials: P
authors.lastname: Tachtatzis
mesh_terms: D000368:Aged; D001777:Blood Coagulation; D001780:Blood Coagulation Tests; D001792:Blood Platelets / Q000276:immunology; D017809:Fatal Outcome; D006801:Humans; D016756:Immunoglobulins, Intravenous / Q000627:therapeutic use; D007166:Immunosuppressive Agents / Q000627:therapeutic use; D007518:Isoantibodies / Q000276:immunology; D008099:Liver / Q000473:pathology; D016031:Liver Transplantation / Q000009:adverse effects*; D008297:Male; D010976:Platelet Count; D016553:Purpura, Thrombocytopenic, Idiopathic / Q000097:blood / Q000175:diagnosis / Q000209:etiology* / Q000628:therapy; D013916:Thrombelastography
chemical_list: D016756:Immunoglobulins, Intravenous; D007166:Immunosuppressive Agents; D007518:Isoantibodies
keywords: GPIb/IX; Immune thrombocytopenia; TMAT; haemorrhage; liver transplantation; passenger lymphocyte syndrome; transplantation-mediated alloimmune thrombocytopenia