A heart donor is almost always someone who has been declared brain dead while their body is still on life support. Once death is confirmed through a series of neurological tests, the donor’s body is carefully maintained so the heart keeps beating until it can be surgically removed, transported, and transplanted into a waiting recipient. The entire process, from declaration of death to the heart reaching its new home, typically unfolds within hours.
How Brain Death Is Determined
Heart donation begins with a tragedy. The donor is usually someone who has suffered a catastrophic brain injury, such as a massive stroke, severe head trauma, or loss of oxygen to the brain. Even though their heart continues to beat with the help of a ventilator, their brain has permanently stopped functioning.
Doctors confirm brain death through three key findings: the person shows no response to painful stimulation, all brainstem reflexes are absent (including pupil reactions and gag reflex), and the person cannot breathe on their own. That last criterion is tested formally: the ventilator is temporarily disconnected, and doctors watch for any attempt to breathe even as carbon dioxide levels in the blood climb high enough that a functioning brainstem would trigger gasping. If there is no effort to breathe, the test confirms the brainstem is no longer working. The patient must be free of sedative drugs and have a normal body temperature before any of these tests are performed, to rule out other explanations.
Keeping the Heart Viable After Death
Once brain death is declared, the donor’s body doesn’t simply shut down. The ventilator stays on, fluids and medications continue, and the medical team shifts its focus to protecting the organs. Without a functioning brain, the body loses its ability to regulate blood pressure, temperature, and fluid balance on its own, so intensive care continues around the clock.
The general target is to keep systolic blood pressure at or above 100 mmHg, urine output steady, blood sugar normal, and core body temperature above 35°C. IV fluids, blood pressure medications, and hormones are adjusted constantly. This phase can last hours or sometimes longer than a day, depending on how quickly a matching recipient is identified and the surgical teams are mobilized.
Who Gets the Heart
Not every waiting patient is a candidate for every available heart. The national system in the United States uses a six-tier priority ranking (Status 1 through Status 6) that places the sickest patients first. Status 1, the most urgent, includes people on certain types of emergency mechanical heart support or those experiencing life-threatening heart rhythms. Status 6 covers stable patients on the waitlist without additional complications.
Blood type and body size must be compatible between donor and recipient. Geography also matters: the system searches for a match within roughly 500 nautical miles of the donor hospital before widening the search, prioritizing medical urgency over proximity. This balances the need to find the sickest patient with the reality that a heart can only survive outside the body for a limited time.
The Legal Side of Consent
In every U.S. state, a version of the Uniform Anatomical Gift Act governs organ donation. If someone has registered as an organ donor, whether at the DMV, on a donor registry website, or through another official channel, that decision is legally binding. Only the donor themselves can revoke it while alive. Family members cannot legally override it.
In practice, though, procurement organizations have traditionally approached families to confirm the donor’s wishes. Current guidelines say families should be informed about the upcoming donation, not asked for permission. When a person has not registered a decision, the next of kin can authorize donation on their behalf.
How the Heart Is Removed
The surgical recovery of a heart is a carefully choreographed procedure, often happening alongside teams recovering other organs like the lungs, liver, and kidneys. Before the heart is stopped, a cannula is placed in the aortic root (the base of the large artery leaving the heart) so that a cold preservation solution can be delivered.
A clamp is then applied to the aorta, and the preservation solution is flushed through the heart’s own blood vessels, stopping it in a relaxed state and cooling it rapidly. This process is called cardioplegia, and it essentially puts the heart into a protective hibernation. Once the solution has been delivered, surgeons divide the major blood vessels: the superior and inferior vena cava (which carry blood into the heart) and the left atrium, leaving a small cuff of tissue attached to the pulmonary veins for the recipient surgeon to work with. The heart is then lifted out of the chest.
Racing the Clock: Preservation and Transport
A donor heart is more sensitive to time outside the body than almost any other transplantable organ. The standard limit for cold storage on ice is about four hours. Beyond that window, the risk of the heart not functioning properly after transplant increases, though some studies have found that crossing the four-hour mark doesn’t always lead to worse outcomes.
Traditional preservation involves placing the heart in a bag of cold solution, packing it in ice, and rushing it to the recipient’s hospital by ambulance, helicopter, or chartered jet. A newer approach uses a portable machine that keeps the heart warm and beating during transport. The only such system used in human transplants pumps a mix of the donor’s own blood and nutrients backward through the aortic root, feeding the heart’s own arteries and keeping it alive at about 34°C. Clinical trials showed this warm-perfusion method performed as well as cold storage in standard-risk transplants. More importantly, it allows surgeons to evaluate hearts that might otherwise be considered too risky, such as those from older donors or those expected to spend more than four hours in transit, potentially expanding the number of hearts available for transplant.
What Happens to the Donor’s Body Afterward
After all authorized organs and tissues are recovered, the surgical team closes all incisions. The body is treated with the same care and respect as in any surgical procedure. Organ donation does not prevent an open-casket funeral. Clothing covers the surgical sites, and funeral directors can work with the body as they normally would. Families are sometimes surprised to learn this, but recovery teams are trained to restore the body’s appearance before releasing it to the family.
Support for the Donor’s Family
Organ procurement organizations across the country offer aftercare services for donor families. Nearly all (98%) facilitate some form of connection between donor families and recipients, typically through anonymous letters exchanged through the procurement organization. If both parties eventually agree, some organizations arrange in-person meetings.
Counseling recommendations are offered by about 86% of procurement organizations, though direct on-site counseling and dedicated support groups are less common, available at fewer than 20% of organizations. Many also provide written materials, online resources, podcasts, and memorial events to help families process their grief and find meaning in their loved one’s donation. Families can often learn general information about the recipients, such as their age, gender, and how they are recovering, without identifying details being shared unless both sides consent.