Transplant Rejection

Transplant Rejection is a topic covered in the 5-Minute Emergency Consult.

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Basics

Description

Immune response to a graft's genetically dissimilar antigens resulting in rejection of the transplanted organ:
  • HLA incompatibility:
    • Most common cause of rejection
    • Rejection of solid organ transplants
  • Blood group incompatibility:
    • Much less of a risk to graft survival than HLA incompatibility
    • May result in hyperacute rejection of primarily vascularized grafts (kidney and heart)
  • 3 phases of rejection:
    • Hyperacute:
      • Immediate postoperative period
      • Antibody reaction to red cells or HLA antigens
      • Endothelial damage
      • Platelets accumulate, thrombi develop, and tissue necrosis occurs.
      • Rare with careful donor–recipient matching
  • Acute:
    • Within the 1st 3 mo postop
    • At any time if immunosuppressant (IS) medication is stopped
    • T-cell–dependent process. Inflammatory cells infiltrate allograft, release cellular and humoral factors, destroys graft
    • Presents with constitutional symptoms and signs of transplant organ insufficiency
  • Chronic:
    • Occurs over years
    • Results in gradual organ failure

Epidemiology

Incidence and Prevalence Estimates
  • Solid organ transplants:
    • End of 2007: 183,222 living transplant patients
    • 27,281 organs transplanted in 2008
    • Most transplanted organs: Kidney (59%), liver (21%), heart (8%), lung (5%), pancreas (4%)
    • Most common diagnosis from visit to ED: Infection (36%), GI/GU pathology (20%), dehydration (15%), electrolyte (10%), CV and pulmonary pathology (10%), injury (8%), rejection (6%). 60% required hospitalization
  • Hematopoietic stem cell transplants:
    • 4,300 transplants in 2008
    • Acute graft-versus-host disease incidence: 20–80%.

Etiology

  • Reduction or noncompliance with medication:
    • Medication interactions with cyclosporine, tacrolimus, or sirolimus:
      • Phenobarbital, phenytoin, carbamazepine, rifampin, isoniazid
  • Kidney transplant rejection:
    • Early rejection caused by T and B lymphocytes, which attack microvasculature and impair graft perfusion; volume depletion, hypotension, infection
    • Chronic rejection caused by progressive nephrosclerosis of renal vessels, infection
  • Liver transplant rejection:
    • Acute: 48% by 6 wk, 65% by 1 yr
      • Commonly follows reduction in the IS regimen
    • Chronic: <5%
      • 1 wk to 6 mo MC range to experience
  • Cardiac transplant rejection:
    • Acute rejection:
      • 75–85% of patients within the 1st 3–6 mo due to T-cell–mediated response
    • Chronic rejection:
      • Accelerated atherosclerosis is the hallmark
      • Associated with change in IS therapy
  • Lung transplant rejection:
    • Acute rejection develops early:
      • Can occur up to 6 times in the 1st year
    • Chronic rejection:
      • 25–40% of patients postop
      • MCC of death in 2nd postop year
      • Rejection caused by endothelial, vascular, and lymphocyte inflammation, recurrent acute rejection
  • Bone marrow transplant rejection:
    • Acute graft-versus-host disease:
      • Immune attack of donor marrow on lung tissue
    • Chronic graft-versus-host disease:
      • 25–50% of patients
    • Marrow rejection:
      • MC in patients with plastic anemia who do not receive total body radiotherapy or in patients receiving mismatched or unrelated transplants

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Citation

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TY - ELEC T1 - Transplant Rejection ID - 307116 Y1 - 2016 PB - 5-Minute Emergency Consult UR - https://emergency.unboundmedicine.com/emergency/view/5-Minute_Emergency_Consult/307116/all/Transplant_Rejection ER -