What Is a Heart Transplant?

If your heart can no longer pump well enough to keep the rest of you going — and medicines, devices, and other operations have done all they can — one option remains on the table: replacing the heart itself. A heart transplant is surgery in which a failing heart is removed and a healthy donor heart is sewn in its place. It is major, uncommon, and carefully rationed surgery, because donor hearts are scarce. This page answers the questions patients usually ask, in the order they usually ask them.

The short video at the top of this page, "Heart Transplant Video", runs about a minute and a quarter, and it works well as a map before you read on: it summarises orthotopic heart transplantation — the standard form, in which the donor heart takes the native heart's place — and outlines the main stages of the operation, from preparing the donor organ to completing the transplant. It was made as an overview for students of cardiac surgery, so expect a brisk, technical tour rather than a patient's-eye view.

When is a transplant even considered?

Almost always at the end of a long road. The typical starting point is advanced heart failure — breathlessness, exhaustion, and fluid build-up that keep returning despite well-managed treatment. Some people reach that point through severe coronary artery disease; others through a weakened heart muscle, valve disease, or a rhythm problem that cannot be controlled. For some, a pump-boosting device such as an implantable defibrillator (ICD) or a mechanical assist pump is the right answer instead, or a bridge while waiting.

Because donor hearts are few, transplant centres assess candidates thoroughly: the heart problem must be severe enough to justify a transplant, and the rest of the body — kidneys, liver, lungs, immune system — must be strong enough to handle the operation and the medicines that follow. That assessment, not the operation, is where most of the waiting and uncertainty sits.

Where does the donor heart come from?

From a person who has died and whose heart can be given through organ donation, matched to the recipient — blood group and body size matter, among other factors. When a suitable heart becomes available, timing takes over: the organ must travel from donor to recipient and be working again within a short window, so transplant teams move quickly, sometimes through the night.

If you'd like the fuller picture of how the operation itself is framed for patients — a transplant "performed on patients with end-stage heart failure or severe coronary artery disease when other medical or surgical treatments have failed" — the longer video "Heart transplant" walks through the procedure in more detail than the short overview above.

What actually happens in the operating theatre?

In outline, the sequence is steady rather than dramatic. You are fully asleep under general anaesthesia, and a heart-lung machine takes over the work of circulating and oxygenating your blood — the same kind of support used in other major heart operations. The surgeon opens the chest, removes the diseased heart, and positions the donor heart so its chambers and great vessels can be connected: the atria, the aorta, the pulmonary artery, and the venae cavae are joined with careful stitching.

Once the connections are complete, blood flow is restored to the new heart. A transplanted heart typically starts beating as it warms and fills — sometimes on its own, sometimes after a gentle electrical prompt — and the team then weans you off the heart-lung machine while watching the new organ take over the circulation. The chest is closed, and you go to intensive care, where the first days are about close monitoring: heart rhythm and pressures, bleeding, kidney function, and early signs of rejection.

What changes afterwards?

Two things, permanently. The first is follow-up: regular clinic visits, blood tests, heart scans, and periodic biopsies of the new heart in the early period, all watching for rejection or infection before symptoms appear. The second is medication. Because the donor heart is foreign tissue, the immune system must be kept from attacking it with anti-rejection (immunosuppressant) medicines, taken every day for as long as the transplant lasts. Those same medicines make infections easier to catch, so transplant recipients learn to treat fevers and new symptoms seriously and to keep vaccinations and hygiene up to date on their team's advice.

Physically, many recipients describe the striking part not as the surgery but as the contrast: walking further without stopping, sleeping flat without breathlessness, getting ordinary life back in stages. Recovery is gradual — weeks for the chest to heal, months for stamina — and cardiac rehabilitation usually guides that rebuild. The wider story of how transplantation replaces a failing organ is told for a sister organ in our guide to kidney transplant, where the same themes of matching, waiting, and lifelong follow-up appear in a different operating theatre.

References & further reading

• MedlinePlus — Heart Transplantation
• MedlinePlus Medical Encyclopedia — Heart transplant
• MedlinePlus — Heart Failure
• NHS — Heart transplant (Organ transplantation, NHS Blood and Transplant)

Frequently Asked Questions

Is a heart transplant the same as open-heart surgery? — It is a form of open-heart surgery — the chest is opened and a heart-lung machine is used — but instead of repairing the existing heart, the surgeon removes it and sews in a donor heart. Bypass surgery, by contrast, keeps your own heart and reroutes blood around blocked arteries.

How long is the wait for a donor heart? — There is no single answer, and anyone who gives you an exact figure is guessing. Waiting time depends on your blood group, body size, urgency, and how many suitable donor hearts become available in your region — which is why some people wait with a mechanical pump supporting them in the meantime.

Will I feel the new heart beating differently? — Possibly, at first. A transplanted heart's connections to the body's nerves are cut during surgery, so it can respond more slowly to exercise and rest than a native heart, and its resting rate often runs a little faster. Most recipients simply adapt to this as they recover, guided by their transplant team.

Can a transplanted heart fail? — Yes — rejection episodes, infection, and over years a form of artery disease in the donor heart can all threaten it. That is exactly why the follow-up schedule and daily anti-rejection medicines are non-negotiable parts of transplant life rather than optional extras.

MedicalVideos.com has published trusted medical videos since 2007. The site was founded by Dr. Mohamed Ibrahim, MD, PhD — physician-scientist.

Educational only — this article is general information about heart transplantation, not medical advice and not a diagnosis. Whether a transplant is appropriate, and how a candidacy is assessed, belongs to your own cardiology and transplant team.