Autologous is a medical term meaning derived from oneself or relating to the patient’s own body. It is used to describe procedures, tissues, or biological materials sourced from the same individual who will receive them, eliminating the risk of immune rejection or disease transmission that exists when materials are taken from another person (allograft or allogeneic source).
In cardiac surgery, autologous tissue is used in several contexts. Autologous pericardium (the patient’s own pericardial sac) can be harvested and used as a patch to repair defects or construct conduits during cardiac surgery, as it integrates well with the patient’s own tissues. In coronary artery bypass grafting (CABG), the saphenous vein from the leg and the radial artery from the forearm are autologous grafts: the patient’s own blood vessels used to bypass blocked coronary arteries.
In blood transfusion, autologous transfusion refers to collecting and storing a patient’s own blood before a planned surgical procedure, to be reinfused if blood loss occurs during the operation. This avoids the need for donor blood and eliminates transfusion reactions and infection risk from allogeneic (donor) blood.
Autologous stem cell therapy is an area of research in cardiac medicine, in which stem cells are harvested from the patient’s own bone marrow or blood, processed, and reintroduced into the coronary circulation or heart muscle with the aim of promoting regeneration of damaged myocardium after heart attack. To date, clinical trial results have been mixed, and autologous cardiac stem cell therapy remains investigational rather than standard clinical practice.
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