Heart transplant Treatment

Replacing a Failing Heart: What Treatment Aims to Achieve

When a person's heart becomes too weak or damaged to pump blood effectively throughout the body, and all other medical treatments have stopped working, doctors may consider a heart transplant as a final treatment option. This is not a cure, but rather a life-saving procedure that aims to improve both the quality and length of a patient's life.1 The goal is to replace a severely diseased heart with a healthy donor heart, allowing the person to return to many normal daily activities that were previously impossible due to heart failure, a condition where the heart cannot pump enough blood to meet the body's needs.2

Heart transplant treatment is highly individualized and depends on many factors, including the stage and severity of the heart disease, the patient's overall health, age, and other existing medical conditions. The decision to pursue a transplant involves extensive evaluation by a specialized team of heart doctors, surgeons, nurses, social workers, psychologists, and other healthcare professionals.3 Treatment guidelines established by major medical organizations such as the American College of Cardiology, American Heart Association, Heart Failure Society of America, and European Society of Cardiology help doctors determine who might benefit most from this complex intervention.3

The treatment journey begins long before surgery and continues for the rest of the patient's life. Before transplant, patients often require other forms of support to keep them alive while waiting for a suitable donor heart. After surgery, the focus shifts to preventing the body from rejecting the new heart and managing the side effects of lifelong medications. Throughout this process, research continues into new ways to improve outcomes, reduce complications, and expand access to this life-saving treatment for more patients who need it.

Standard Medical and Surgical Treatments for End-Stage Heart Disease

Heart transplantation becomes necessary when someone develops end-stage heart failure, meaning their heart has permanent damage or weakness that prevents it from working properly despite all other treatments. In adults, this severe heart failure can result from several conditions: a weakening of the heart muscle itself called cardiomyopathy, blockages in the heart's blood vessels known as coronary artery disease, problems with the heart valves that control blood flow, birth defects affecting the heart's structure called congenital heart disease, or dangerous irregular heartbeats that medications and other procedures cannot control.1 In children, the most common causes are congenital heart defects or cardiomyopathy.1

Before a transplant becomes necessary, doctors try many other treatments first. Patients typically receive medications to help the heart pump more effectively and to manage symptoms such as shortness of breath and swelling. These may include drugs that remove excess fluid from the body, medications that reduce the heart's workload, or substances that help the heart muscle contract more forcefully. Some patients may undergo procedures like angioplasty, where doctors open blocked blood vessels, or bypass surgery, where surgeons create new pathways for blood to flow around blockages.4

When these standard approaches fail, patients may need mechanical circulatory support devices to keep them alive while waiting for a donor heart. One important device is the Left Ventricular Assist Device or LVAD, which is a mechanical pump surgically implanted in the patient's chest. This pump helps move blood from the heart's left ventricle throughout the body. The device connects through the skin to a controller and battery pack that the patient wears outside their body.5 Another option is a Total Artificial Heart (TAH), which temporarily replaces the heart's pumping function while a patient waits for transplant.4

Some patients receive medications called inotropes through their veins, which help the heart pump more strongly. These powerful drugs require close monitoring and often mean the patient must stay in the hospital.3 Other patients might wear a LifeVest, which is a portable device that continuously monitors the heart's rhythm and can deliver an electric shock if it detects a dangerous abnormal rhythm that could cause sudden death.5

For the most critically ill patients who are not stable enough even for an LVAD, doctors may use extracorporeal membrane oxygenation or ECMO. This technique involves placing tubes in large blood vessels in the neck, groin, or chest to pump blood outside the body through a machine that adds oxygen before returning it to the body. Patients on ECMO are usually sedated and on a breathing machine, though some may be awake enough to participate in physical therapy while the machine supports them.5

The Transplant Evaluation and Waiting List Process

Not everyone with severe heart failure qualifies for a transplant. The evaluation process is thorough because donor hearts are extremely limited, and doctors must ensure that each precious organ goes to someone who has the best chance of long-term survival and benefit. When a patient's regular cardiologist determines that no other treatments will work, they refer the patient to a specialized heart transplant program for evaluation.2

The evaluation includes numerous tests to assess both heart function and overall health. Doctors order blood tests to check for infections, organ function, and blood type compatibility. Imaging studies such as chest X-rays, echocardiograms (ultrasound pictures of the heart), and sometimes cardiac catheterization provide detailed information about the heart's structure and function. An electrocardiogram or ECG records the heart's electrical activity. Additional tests evaluate how well the lungs, kidneys, liver, and other organs are functioning.4

Beyond physical health, the evaluation team assesses psychological readiness and social support. A psychologist or psychiatrist meets with the patient to discuss their mental health, coping skills, and understanding of what life after transplant will require. Social workers evaluate whether the patient has family or friends who can provide care and support, as well as adequate financial resources and insurance coverage for the surgery and lifelong follow-up care.3

Several conditions may make someone ineligible for a heart transplant. These include active cancer or recent cancer history, severe lung disease that would make surgery too risky, serious kidney or liver disease (unless the patient qualifies for a multi-organ transplant), active infections like HIV or hepatitis C that are not controlled, current use of tobacco, alcohol, or drugs, severe obesity with a body mass index over 35, poorly controlled diabetes, age over 70 in most cases, or a history of not taking prescribed medications as directed.4 The last factor is particularly important because transplant recipients must take anti-rejection medications exactly as prescribed for the rest of their lives.

If approved for transplant, the patient is added to a national waiting list managed by the United Network for Organ Sharing (UNOS), a private nonprofit organization. The waiting time varies greatly depending on blood type, body size, how urgently the heart is needed, and other medical factors. Some patients wait weeks while others wait many months. During this waiting period, patients must remain close to their transplant center, attend regular check-up appointments, and be ready to come to the hospital immediately when a donor heart becomes available.4

The Heart Transplant Surgical Procedure

Heart transplant surgery is performed under general anesthesia, meaning the patient is completely unconscious and feels no pain. The operation typically takes four to five hours, though it may take longer if the patient has a ventricular assist device that must be removed first.6 The surgical team makes a large cut down the center of the chest and separates the breastbone to access the heart.

There are two main types of heart transplant procedures, though one is far more common than the other. The standard approach is called an orthotopic heart transplant, where surgeons remove the patient's diseased heart and replace it with the donor heart in the same position. Much less commonly, surgeons perform a heterotopic or "piggyback" transplant, where they leave the patient's own heart in place and attach the donor heart alongside it to provide additional pumping support.3

During the orthotopic procedure, the surgical team connects the patient to a heart-lung machine, which temporarily takes over the work of pumping blood and adding oxygen while the surgeons operate. They then remove the damaged heart and carefully connect the donor heart to the major blood vessels entering and leaving the chest. Once all connections are secure, they restore blood flow to the new heart. The donor heart usually begins beating on its own once blood flow is restored, though medications may be needed to support it initially.6

After the surgery is complete, the patient is transferred to an intensive care unit (ICU) for close monitoring. They remain on a breathing machine (ventilator) for one to three days until they can breathe on their own. The ICU stay typically lasts about five days, followed by another week to ten days in a regular hospital room as the patient recovers.7 During this time, the medical team watches carefully for signs of complications and begins the patient on anti-rejection medications.

Post-Transplant Care and Medications

After discharge from the hospital, the real work of living with a transplanted heart begins. Patients must stay near the transplant center for several weeks for frequent monitoring. Initial follow-up visits occur twice per week for about two weeks, then weekly, then every two weeks, gradually spacing out to monthly visits by six months after transplant.8

These clinic visits are comprehensive and time-consuming, often taking most of the day. They typically include blood tests to check medication levels and organ function, an echocardiogram to visualize the heart, a chest X-ray, and meetings with various members of the transplant team including the nurse coordinator, doctors, and sometimes the dietitian, social worker, and pharmacist.8

One of the most important aspects of post-transplant follow-up is the heart biopsy, performed regularly to check for signs of rejection. During this procedure, doctors insert a thin tube called a catheter into a blood vessel in the neck or groin and guide it to the heart, where they remove tiny samples of heart tissue for examination under a microscope. This test is essential because rejection can occur even when the patient feels fine.6 Biopsies are performed frequently in the first few months after transplant, then less often as time goes on.

The cornerstone of long-term care after heart transplant is immunosuppressive medications, also called anti-rejection drugs. These medications must be taken exactly as prescribed every day for the rest of the patient's life. They work by suppressing the immune system so it does not attack and destroy the donor heart, which the body recognizes as foreign tissue.9 Common immunosuppressive medications include drugs that target different parts of the immune system response.

The challenge with immunosuppressive medications is finding the right balance. If the dose is too low, rejection may occur. If the dose is too high, the patient becomes extremely vulnerable to infections because their immune system cannot fight off bacteria, viruses, and fungi effectively. Side effects of these medications can include increased risk of infections, kidney problems, high blood pressure, diabetes, elevated cholesterol, osteoporosis (weak bones), and an increased risk of certain cancers over time.9 Blood tests monitor medication levels and organ function to help doctors adjust doses as needed.

In addition to anti-rejection drugs, transplant recipients typically take several other medications. These may include drugs to prevent infections, manage blood pressure, prevent blood clots, protect the stomach from ulcers, and treat or prevent diabetes. Pain medications are used in the weeks after surgery as the surgical incision heals.7 Patients should never take over-the-counter medications or herbal supplements without first checking with their transplant team, as these can interact with immunosuppressive drugs.

Living with a Transplanted Heart: Recovery and Lifestyle Changes

Recovery from heart transplant is gradual and varies from person to person. For the first three to four months, patients cannot lift heavy objects or do activities that strain the chest or upper arm muscles. This includes pushing a lawn mower or vacuum cleaner, mopping floors, swinging a golf club or tennis racquet, or lifting heavy grocery bags. For at least six weeks, patients should not use their arms to push themselves up from bed or chairs or pull themselves into or out of vehicles.10

Physical activity is actually encouraged and essential for recovery, but it must be appropriate and gradual. Most patients begin a cardiac rehabilitation program in the hospital that continues after discharge. This structured program helps patients safely rebuild strength and endurance through supervised exercise.11 Walking is typically the first activity, starting with short distances and gradually increasing. Many transplant recipients eventually return to more vigorous activities such as running, swimming, dancing, and playing sports, though this takes time.12

Breathing exercises are important in the weeks after surgery to prevent pneumonia and help the lungs fully expand. Patients are taught to hold a pillow firmly against their chest incision when coughing or taking deep breaths to support the healing breastbone and reduce pain.10 The breastbone takes about four to six weeks to heal fully.

Diet becomes an important part of post-transplant life. Patients typically follow a heart-healthy diet low in sodium (salt), cholesterol, and saturated fats. Avoiding excessive salt helps prevent fluid retention and high blood pressure. Some immunosuppressive medications interact with certain foods, particularly grapefruit and grapefruit juice, which must be avoided entirely. Because the immune system is suppressed, food safety is crucial - patients must avoid raw or undercooked meats, raw eggs, unpasteurized dairy products, and unwashed fruits and vegetables that could harbor harmful bacteria.8

Patients must be vigilant about avoiding infections. This means frequent handwashing, avoiding crowds during cold and flu season, staying away from people who are sick, and receiving certain recommended vaccines (though not live vaccines, which could be dangerous with a suppressed immune system). Dental care is particularly important because bacteria from the mouth can enter the bloodstream and affect the heart. Patients should inform their dentist about the transplant and may need to take antibiotics before dental procedures.13

Most people can return to work three to twelve weeks after transplant, depending on the type of work and how they feel. Office work can typically resume sooner than physically demanding jobs. Driving is usually restricted for several weeks until cleared by the doctor. Sexual activity can resume once the doctor determines it is safe, typically after the breastbone has healed.10

The emotional and psychological aspects of living with a transplanted heart should not be underestimated. Patients may experience a complex mix of emotions including gratitude for the gift of life, guilt about another person's death, anxiety about rejection or complications, and depression. These feelings are normal, and support from family, friends, counselors, and support groups can be invaluable.11 Many transplant centers offer support groups specifically for transplant recipients and their families.

Complications and Risks of Heart Transplantation

Like all major surgeries, heart transplantation carries risks. General surgical risks include bleeding, stroke, damage to other organs such as the kidneys or liver, blood clots, and infection. While these complications are possible, they occur relatively infrequently in experienced transplant centers.6

One of the most serious early complications is primary graft dysfunction, meaning the new heart does not start beating and pumping effectively right away. When this happens, the patient may need to be placed back on the heart-lung machine until the heart recovers. In rare cases where the heart does not recover, a second emergency transplant may be necessary.6

Rejection is the most significant ongoing risk after heart transplant. Acute rejection occurs when the patient's immune system recognizes the donor heart as foreign and attacks it. This is why immunosuppressive medications are so critical and why regular heart biopsies are performed to detect rejection early, even before symptoms appear. With prompt treatment, most episodes of acute rejection can be reversed by temporarily increasing immunosuppressive medications.6

Over time, a different form of rejection called cardiac allograft vasculopathy or graft coronary artery disease can develop. This involves gradual narrowing of the blood vessels in the transplanted heart, similar to coronary artery disease but caused by the immune system's chronic response to the donor organ. This complication develops slowly over years and is monitored through regular testing including coronary angiograms, a procedure where doctors inject dye into the heart's blood vessels and take X-ray pictures to look for narrowing.8

Infections are a constant concern because immunosuppressive medications weaken the body's ability to fight bacteria, viruses, and fungi. Patients are at increased risk for common infections like colds and pneumonia as well as unusual infections that rarely affect people with normal immune systems. Some infections can be life-threatening if not recognized and treated promptly.6

Long-term complications can include high blood pressure, diabetes, kidney disease, osteoporosis, and an increased risk of certain cancers, particularly skin cancers and lymphomas. These complications may be caused by the immunosuppressive medications themselves, the stress of the transplant on the body, or a combination of factors. Regular screening and preventive care are essential to detect and manage these problems early.9 All transplant recipients should use sunscreen and protective clothing when outdoors to reduce skin cancer risk.

Innovative Treatments Being Studied in Clinical Trials

While the standard approach to heart transplantation has improved dramatically since the first successful human-to-human transplant in 1967, researchers continue to explore new ways to make transplants safer, more successful, and available to more patients. Clinical trials are investigating new immunosuppressive medications, different surgical techniques, improved methods of preserving donor hearts, and alternative sources of hearts for transplantation.14

One particularly exciting area of research involves xenotransplantation, which is transplanting organs from animals into humans. In January 2022, surgeons performed the world's first successful pig-to-human heart transplant using a genetically modified pig heart. The pig had been specially engineered so its tissues would be less likely to trigger rejection in a human recipient.14 While this field is still very experimental and not yet available as standard treatment, it holds promise for eventually expanding the supply of hearts available for transplant beyond what deceased human donors can provide.

Researchers are also studying new immunosuppressive medications that might be more effective at preventing rejection while causing fewer side effects. Clinical trials test different drug combinations to find the optimal balance between preventing rejection and minimizing complications like infections, kidney damage, and cancer risk. These trials typically enroll patients who have recently received transplants and compare outcomes between those receiving the new treatment versus standard treatment.

Another area of investigation involves improving the preservation of donor hearts. Currently, once a heart is removed from a donor, it must be transplanted within four to six hours. Researchers are developing new preservation solutions and techniques, including devices that keep the heart warm and beating with oxygenated blood flowing through it during transport, rather than cooling it and stopping its function. These approaches may allow hearts to remain viable for longer periods and possibly allow donation from donors whose hearts currently cannot be used.14

Some clinical trials are exploring ways to reduce or even eliminate the need for lifelong immunosuppression. Researchers are investigating whether certain treatments given around the time of transplant might teach the immune system to tolerate the donor heart without constant medication. This approach, called tolerance induction, is still highly experimental but could revolutionize transplantation if successful.

Patients interested in participating in clinical trials related to heart transplantation should discuss options with their transplant team. Not all patients will be eligible for all trials, which typically have strict entry requirements based on age, disease severity, time since transplant, and other medical factors. Participation in a clinical trial may provide access to cutting-edge treatments not yet widely available, but it also involves additional monitoring and tests beyond standard care.

Outcomes and Long-Term Survival

Thanks to advances in surgical techniques, organ preservation, immunosuppressive medications, and post-transplant care, outcomes after heart transplantation have improved dramatically. Most heart transplant recipients can expect to live for many years with good quality of life. Post-operative survival periods average 15 years, and many patients live even longer.14 Heart transplant recipients can often perform the same level of physical activity and enjoy similar quality of life as people who have never had a heart transplant.7

Around the world, approximately 5,000 heart transplants are performed each year, with more than half occurring in the United States. In 2020, just under 8,200 transplants were performed worldwide, with the United States performing 3,658 of these procedures.2 These numbers have been growing as surgical techniques improve and more transplant centers gain experience with this complex procedure.

The first year after transplant is the most critical period, with the highest risk of complications including rejection, infection, and other problems. Patients who survive the first year generally have a good prognosis for long-term survival. Regular monitoring, adherence to the medication schedule, maintaining a healthy lifestyle, and promptly reporting any concerning symptoms all contribute to better outcomes.13

Most common treatment methods

• Immunosuppressive medications
  • Daily anti-rejection drugs that suppress the immune system to prevent the body from attacking the transplanted heart, taken for life
  • Medication doses are carefully balanced through regular blood tests to prevent rejection while minimizing side effects like infections and organ damage
  • Multiple drugs are typically used together, each targeting different parts of the immune response
• Mechanical circulatory support devices
  • Left Ventricular Assist Device (LVAD) - a mechanical pump implanted in the chest that helps move blood from the heart throughout the body while patients wait for a donor heart
  • Total Artificial Heart (TAH) - a device that temporarily replaces the heart's pumping function during the waiting period
  • Extracorporeal Membrane Oxygenation (ECMO) - pumps blood outside the body through a machine that adds oxygen, used for critically ill patients
• Heart biopsy monitoring
  • Regular removal of tiny samples of heart tissue through a catheter to check for rejection under a microscope
  • Performed frequently in the first months after transplant, then less often over time
  • Essential because rejection can occur without symptoms
• Cardiac rehabilitation
  • Structured exercise program that begins in the hospital and continues after discharge
  • Helps patients safely rebuild strength, endurance, and muscle mass lost during illness
  • Includes supervised physical activity, education, and psychological support
• Multi-organ transplantation
  • Heart-kidney transplant for patients with both heart and kidney failure
  • Heart-liver transplant for certain combined liver and heart conditions
  • Heart-lung transplant for severe combined heart and lung diseases that cannot be treated with single-organ transplant