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Hub AI
Organ procurement AI simulator
(@Organ procurement_simulator)
Hub AI
Organ procurement AI simulator
(@Organ procurement_simulator)
Organ procurement
Organ procurement (also called surgical recovery) is a surgical procedure that removes organs or tissues for reuse, typically for organ transplantation.
If the organ donor is human, most countries require that the donor be legally dead for consideration of organ transplantation (e.g. cardiac death or brain death). For some organs, a living donor can be the source of the organ. For example, living donors can donate one kidney or part of their liver to a well-matched recipient.
Organs cannot be procured after the heart has stopped beating for a long time. Thus, donation after brain death is generally preferred because the organs are still receiving blood from the donor's heart until minutes before being removed from the body and placed on ice. In order to better standardize the evaluation of brain death, The American Academy of Neurology (AAN) published a new set of guidelines in 2010. These guidelines require that three clinical criteria be met in order to establish brain death: coma with a known cause, absence of brain stem reflexes, and apnea.
Donation after cardiac death (DCD) involves surgeons taking organs within minutes of the cessation of respirators and other forms of life support for patients who still have at least some brain activity. This occurs in situations where, based on the patient's advanced directive or the family's wishes, the patient is going to be withdrawn from life support. After this decision has been made, the family is contacted for consideration for organ donation. Once life support has been withdrawn, there is a 2-5 minute waiting period to ensure that the potential donor's heart does not start beating again spontaneously. After this waiting period, the organ procurement surgery begins as quickly as possible to minimize time that the organs are not being perfused with blood. DCD had been the norm for organ donors until 'brain death' became a legal definition in the United States in 1981. Since then, most donors have been brain-dead.
If consent is obtained from the potential donor or the potential donor's survivors, the next step is to perform a match between the source (donor) and the target (recipient) to reduce rejection of the organ by the recipient's immune system. In the United States, the match between human donors and recipients is coordinated by groups like United Network for Organ Sharing.
Co-ordination between teams working on different organs is often necessary in case of multiple-organ procurement. Multiple-organ procurement models are also developed from slaughtered pigs to reduce the use of laboratory animals.
The quality of the organ then is certified. If the heart stopped beating for too long then the organ becomes unusable and cannot be used for transplant.
After organ procurement, the organs are often rushed to the site of the recipient for transplantation or preserved for later study. The faster the organ is transplanted into the recipient, the better the outcome. While the organ is being transported, it is either stored in an icy cold solution to help preserve it or it is connected to a miniature organ perfusion system which pumps an icy solution (sometimes enriched with potassium) through the organ. This time during transport is called the "cold ischemia time". Heart and lungs should have less than 6 hours between organ procurement and transplantation. For liver transplants, the cold ischemia time can be up to 24 hours, although typically surgeons aim for a much shorter period of time. For kidney transplants, as the cold ischemia time increases, the risk of delayed function of the kidney increases. Sometimes, the kidney function is delayed enough that the recipient requires temporary dialysis until the transplanted kidney begins to function.
Organ procurement
Organ procurement (also called surgical recovery) is a surgical procedure that removes organs or tissues for reuse, typically for organ transplantation.
If the organ donor is human, most countries require that the donor be legally dead for consideration of organ transplantation (e.g. cardiac death or brain death). For some organs, a living donor can be the source of the organ. For example, living donors can donate one kidney or part of their liver to a well-matched recipient.
Organs cannot be procured after the heart has stopped beating for a long time. Thus, donation after brain death is generally preferred because the organs are still receiving blood from the donor's heart until minutes before being removed from the body and placed on ice. In order to better standardize the evaluation of brain death, The American Academy of Neurology (AAN) published a new set of guidelines in 2010. These guidelines require that three clinical criteria be met in order to establish brain death: coma with a known cause, absence of brain stem reflexes, and apnea.
Donation after cardiac death (DCD) involves surgeons taking organs within minutes of the cessation of respirators and other forms of life support for patients who still have at least some brain activity. This occurs in situations where, based on the patient's advanced directive or the family's wishes, the patient is going to be withdrawn from life support. After this decision has been made, the family is contacted for consideration for organ donation. Once life support has been withdrawn, there is a 2-5 minute waiting period to ensure that the potential donor's heart does not start beating again spontaneously. After this waiting period, the organ procurement surgery begins as quickly as possible to minimize time that the organs are not being perfused with blood. DCD had been the norm for organ donors until 'brain death' became a legal definition in the United States in 1981. Since then, most donors have been brain-dead.
If consent is obtained from the potential donor or the potential donor's survivors, the next step is to perform a match between the source (donor) and the target (recipient) to reduce rejection of the organ by the recipient's immune system. In the United States, the match between human donors and recipients is coordinated by groups like United Network for Organ Sharing.
Co-ordination between teams working on different organs is often necessary in case of multiple-organ procurement. Multiple-organ procurement models are also developed from slaughtered pigs to reduce the use of laboratory animals.
The quality of the organ then is certified. If the heart stopped beating for too long then the organ becomes unusable and cannot be used for transplant.
After organ procurement, the organs are often rushed to the site of the recipient for transplantation or preserved for later study. The faster the organ is transplanted into the recipient, the better the outcome. While the organ is being transported, it is either stored in an icy cold solution to help preserve it or it is connected to a miniature organ perfusion system which pumps an icy solution (sometimes enriched with potassium) through the organ. This time during transport is called the "cold ischemia time". Heart and lungs should have less than 6 hours between organ procurement and transplantation. For liver transplants, the cold ischemia time can be up to 24 hours, although typically surgeons aim for a much shorter period of time. For kidney transplants, as the cold ischemia time increases, the risk of delayed function of the kidney increases. Sometimes, the kidney function is delayed enough that the recipient requires temporary dialysis until the transplanted kidney begins to function.