Medicine
Organ Donation After Circulatory Death vs. Brain Death
Quick fact
In donation after brain death (DBD), the heart continues to beat and circulate blood even after all brain function has ceased, keeping organs oxygenated. In donation after circulatory death (DCD), organs are recovered only after the heart has stopped and circulation has irreversibly ceased.
Why this is interesting
You've probably heard that someone can be 'brain dead' but still have a heartbeat. But did you know that organ donation can happen after a person's heart stops too? Let's unravel the difference.
Read the full explanation
Understanding Organ Donation After Circulatory Death vs. Brain Death
To understand donor types, we first need to understand two ways a person can be declared dead. Brain death is the irreversible loss of all brain function, including the brainstem, which controls vital reflexes like breathing. Even though the heart may still beat (because it has its own intrinsic pacemaker), a person is legally and medically dead. In DBD, because circulation persists, organs are kept healthy until the moment of recovery. In contrast, circulatory death (also called cardiac death) is declared when the heart stops beating and blood stops circulating, and this is irreversible. In DCD, the patient's heart has stopped, so circulation has ceased, and organs experience a period without oxygen (warm ischemia) before they are removed, which can damage them. Therefore, DCD is often used only when a patient's family or the patient himself has decided to withdraw life-sustaining treatment because further care is futile, and the organs are recovered quickly after death.
A deeper explanation
The fundamental difference lies in the definition of death and the condition of the organs. In brain death, the heart may continue to beat because it is not solely controlled by the brain; it has its own pacemaker. In DBD, the donor is declared dead by brain death criteria, but their heart is still beating, maintaining blood flow to organs until organ recovery, which is why such organs are often in better condition. In DCD, the donor is declared dead by circulatory criteria—irreversible cessation of circulation. After cardiac arrest and a period of observation (typically 2-5 minutes of no heartbeat and no breathing), death is pronounced. Organs are then quickly recovered. However, because circulation has stopped, the organs suffer from warm ischemia, which can lead to cell damage and poorer transplant outcomes. Therefore, DCD is more often used for organs like kidneys, livers, and lungs that can tolerate some oxygen deprivation, whereas DBD allows for recovery of a wider range of organs including the heart and pancreas, which are more sensitive to ischemia.