When a surgeon conducts a cardiac bypass operation by transplanting a piece of vein from a patie

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When a surgeon conducts a cardiac bypass operation by...

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Key Concepts

Autograft

This refers to a tissue or organ transplant where the donor and the recipient are the same individual. Because the transplanted tissue is the patient’s own, the immune system recognizes it as self, significantly reducing or eliminating the chance of rejection.

Allograft

An allograft is a transplant between two genetically non-identical members of the same species. This procedure carries a higher risk of immunologic rejection because the immune system recognizes the tissue as foreign, often requiring immunosuppressive therapy.

Graft Rejection

Graft rejection is the immune-mediated response against transplanted tissue that is recognized as foreign. This process can lead to the failure of the transplanted tissue and is a major concern in cases of allografts or xenografts.

Type IV Hypersensitivity

A type IV hypersensitivity reaction, also known as delayed-type hypersensitivity, is an immune response mediated by T-cells rather than antibodies. It plays a significant role in the rejection of transplanted tissues in non-autologous grafts, where the immune system mounts a cell-mediated response over time.

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