Heart-Lung Transplant

Introduction

A heart-lung transplant is one of the rarest and most complex operations in modern medicine. It is offered to a small number of carefully selected patients whose heart and lungs have both reached a point where medications, oxygen therapy, and other surgeries can no longer keep them well. If you or someone you love is being assessed for this surgery, you are entering a long process that involves a full medical evaluation, time on a waiting list, the operation itself, and a lifetime of careful follow-up.

This guide explains what a heart-lung transplant is, who it is considered for, the alternatives that are usually tried first, what happens during the surgery, and what recovery and life after transplant typically look like. The goal is to help you understand the journey clearly, so that the conversations you have with your transplant team feel less overwhelming and more informed.

Because heart-lung transplantation involves two organs at once, it is more demanding than either a heart transplant or a lung transplant alone. It is performed at a small number of specialised transplant centres, and the decision to proceed is always made by a multidisciplinary team that includes cardiac surgeons, thoracic surgeons, cardiologists, pulmonologists, transplant coordinators, anaesthetists, and mental health professionals.

What Is a Heart-Lung Transplant?

The heart-lung circulation loop showing: ① right ventricle, ② pulmonary arteries, ③ lungs (gas exchange), ④ pulmonary veins, ⑤ left ventricle, ⑥ aorta and systemic circulation.

*AI-generated image - for illustration only. Clinical accuracy is not guaranteed.

A heart-lung transplant is a surgical procedure in which a person’s failing heart and both lungs are removed and replaced with a healthy heart and lungs from a single deceased donor. The two organs are transplanted together, as a connected unit, because in many of the conditions that require this operation the heart and lungs have damaged each other over time. Replacing only one would not solve the problem.

The heart pumps blood to the lungs, where it picks up oxygen, and then back out to the rest of the body. When the lungs are severely diseased, the right side of the heart has to work much harder to push blood through them. Over months and years, this extra strain can permanently damage the heart muscle. In other conditions, the heart is the original problem and the lungs are damaged by long-term back-pressure or low oxygen. Either way, both organs eventually fail together.

A heart-lung transplant is different from:

• A heart transplant alone, where only the heart is replaced. This is used when the lungs are still healthy enough to work normally.
• A lung transplant alone (single or double), where one or both lungs are replaced but the original heart stays in place. This is the more common option when heart function is expected to recover once the lungs are working properly.

The choice between these options is made carefully by the transplant team based on detailed testing of both heart and lung function. In recent decades, advances in lung transplantation have meant that many patients who would once have needed a heart-lung transplant can now be helped with a double lung transplant instead. As a result, true heart-lung transplants are now uncommon worldwide.

Why Is a Heart-Lung Transplant Performed?

A heart-lung transplant is considered only when both the heart and lungs are damaged to a point that life expectancy and quality of life are severely limited, and when other treatments have been exhausted. The most common reasons include:

Severe pulmonary arterial hypertension

Pulmonary arterial hypertension is high blood pressure in the arteries that carry blood from the heart to the lungs. Over time, the right side of the heart can fail from the strain. When medical therapy can no longer control the disease and the right heart is severely damaged, a heart-lung transplant may be considered.

Eisenmenger syndrome

Eisenmenger syndrome develops when a hole or abnormal connection in the heart (a congenital defect that was not repaired in time) causes long-term changes in the lung arteries. Eventually blood flow reverses and oxygen levels drop. Because both the heart defect and the lung damage need to be corrected, a heart-lung transplant is sometimes the most suitable option.

Complex congenital heart disease with lung damage

Some adults living with complex congenital heart disease that was not fully correctable in childhood develop combined heart and lung failure. When the heart anatomy is too abnormal for a standard heart transplant alone and the lungs are also affected, a heart-lung transplant may be the only realistic option.

Advanced cystic fibrosis or other lung disease with heart failure

In some cases of cystic fibrosis, severe emphysema, or pulmonary fibrosis, both lungs are destroyed and the heart has been irreversibly damaged. Most such patients can be treated with a double lung transplant, but in a small number of cases, the heart cannot recover and both organs are replaced together.

Other rare causes

Conditions such as severe sarcoidosis, pulmonary veno-occlusive disease, and certain failed previous surgeries can occasionally lead to combined heart-lung transplantation.

In all of these situations, the underlying principle is the same: both organs are failing, neither can be expected to recover, and replacing only one would not restore normal function.

Who Is a Candidate?

Being a candidate for a heart-lung transplant means more than having severe disease. The transplant team has to be confident that you are likely to survive the operation, tolerate lifelong immunosuppressive medications, and follow the demanding follow-up plan that comes with transplanted organs. Selection is rigorous because donor organs are extremely scarce.

Factors that support candidacy

• End-stage disease affecting both heart and lungs, with a poor expected outcome on current treatment
• No other surgical or medical option likely to provide meaningful benefit
• Otherwise reasonable general health, including kidney and liver function
• Strong support from family or carers
• Demonstrated ability and willingness to take medications reliably and attend follow-up
• Stable mental health, with treatment for any underlying conditions

Factors that may reduce or rule out candidacy

• Active infection that cannot be controlled
• Active cancer, or recent cancer where recurrence risk is significant
• Severe damage to other major organs, such as the kidneys or liver, that would not recover after transplant
• Ongoing smoking, alcohol misuse, or substance use
• Inability to follow complex medication and follow-up plans
• Severe obesity or very low body weight, which can affect surgical outcomes
• Advanced age in combination with other significant medical problems

Age alone is not usually an absolute barrier. International transplant societies, including the International Society for Heart and Lung Transplantation (ISHLT), describe candidacy as a balance of factors rather than a single cut-off. Each centre also has its own protocols, and patients who are not accepted at one centre are sometimes accepted at another.

Alternatives to Heart-Lung Transplant

Comparison of transplant options: ① heart transplant alone (lungs retained), ② double lung transplant alone (heart retained), ③ combined heart-lung transplant (both organs replaced).

*AI-generated image - for illustration only. Clinical accuracy is not guaranteed.

Before a heart-lung transplant is offered, most patients will have already tried, or been evaluated for, several other treatments. Understanding these alternatives can help explain why transplant has become the option under discussion.

Medical therapy for pulmonary hypertension

For patients with pulmonary arterial hypertension, several classes of medication are now available, including endothelin receptor antagonists, phosphodiesterase-5 inhibitors, prostacyclin analogues, and soluble guanylate cyclase stimulators. These medications can significantly slow disease progression and improve symptoms. Transplant is considered only when the disease progresses despite optimised combination therapy.

Surgical correction of congenital defects

For some patients with congenital heart disease, earlier surgical repair can prevent the development of Eisenmenger syndrome. Once Eisenmenger physiology is established, however, closing the original defect is usually no longer safe, and transplantation becomes the only option for severe disease.

Double lung transplant alone

A double lung transplant, leaving the patient’s own heart in place, is now the preferred approach for most patients with severe lung disease, even when there is significant right heart strain. This is because the right side of the heart often recovers once lung blood pressure normalises after lung transplant. Lung transplants are also more common globally and donor availability is somewhat better. The transplant team will assess heart function carefully to determine whether the heart can be expected to recover with new lungs in place.

Heart transplant alone

If the lungs are essentially healthy but the heart has failed, a heart transplant alone may be appropriate. Sometimes the question of whether the lungs are “healthy enough” is difficult, and detailed testing of pulmonary pressures is needed.

Mechanical support devices

Ventricular assist devices (VADs) can support a failing heart and are sometimes used as a bridge to transplant. Extracorporeal membrane oxygenation (ECMO) can support both heart and lung function for short periods in critically ill patients. These devices are not long-term solutions for everyone but can keep some patients alive while they wait for a suitable donor.

Palliative care

For patients who are not candidates for transplant or who choose not to pursue it, palliative care focuses on relieving symptoms, supporting quality of life, and providing emotional and practical support to patients and families. This is an important option that is sometimes discussed alongside transplant evaluation.

The Evaluation and Waiting List

Once a heart-lung transplant is being considered, you will go through a detailed evaluation. This is usually done as an outpatient over days to weeks, or sometimes during a hospital admission if you are very unwell.

Pre-transplant evaluation

The evaluation is designed to confirm that transplant is appropriate, identify any problems that need to be treated first, and gather the information needed for the waiting list. It typically includes:

• Detailed heart imaging, including echocardiogram and sometimes cardiac MRI
• Right heart catheterisation, which measures the pressures in the lung arteries directly
• Pulmonary function tests to measure how well the lungs move air
• CT scans of the chest
• Blood tests for kidney and liver function, blood type, tissue typing, and infection screening (including HIV, hepatitis, tuberculosis, and others)
• Cancer screening appropriate for your age and history
• Dental and other source-of-infection checks
• Nutritional assessment
• Psychological and social evaluation, including discussion of family support and your ability to manage long-term medication

Going on the waiting list

If the team decides that transplant is appropriate, your details are added to a national transplant waiting list. In India, organ allocation is regulated under the Transplantation of Human Organs and Tissues Act, and donor organs are matched and allocated through approved organisations.

Waiting time for a heart-lung transplant is unpredictable. Because suitable donors must provide a healthy heart and both lungs from the same person, and because the organs must be size- and blood-type compatible, waits can be long. Some patients receive a call within months; others wait much longer. A small number of patients become too unwell to wait and are removed from the list, while others stabilise and continue to wait.

Bridging therapies while you wait

While on the list, you will continue with whatever medical treatment is keeping you stable. Some patients require mechanical support such as a ventricular assist device or, in critical situations, ECMO, to stay alive long enough to reach transplantation. You will be reassessed regularly to make sure transplant is still appropriate.

Preparing for a Heart-Lung Transplant

Preparation for a heart-lung transplant has two layers: the long preparation while you wait, and the rapid preparation that happens once a donor is identified.

While you wait

• Physical condition. Many transplant programmes encourage patients to stay as physically active as their condition allows, often with the support of a pulmonary or cardiac rehabilitation programme. Better fitness before surgery is associated with better recovery.
• Nutrition. Both severe underweight and significant excess weight increase surgical risk. A dietitian may help you reach a healthier weight.
• Vaccinations. Vaccinations are usually updated before transplant, because some live vaccines cannot be given safely after immunosuppression starts.
• Smoking, alcohol, and other substances. Complete abstinence is required, and adherence is often verified through testing.
• Mental health. Anxiety, depression, and difficulty sleeping are common during the wait. Speaking with a mental health professional, joining a support group, or working with a transplant coordinator can help.
• Practical planning. Once a donor is found, you may have only a few hours to reach the hospital. Many transplant programmes ask patients to stay within a defined distance of the centre and to have a packed hospital bag and transport plan ready at all times.

When a donor is identified

When the transplant centre is offered suitable donor organs and you are selected as the recipient, the team will call you in urgently. You will be asked not to eat or drink, transported quickly to the hospital, and re-checked for any new infection or change in your condition. Final blood tests, imaging, and consent discussions happen rapidly. If everything is in order, you will be taken to the operating room.

What Happens During the Surgery

A heart-lung transplant is a long and highly specialised operation, typically lasting six to eight hours, and sometimes longer.

Anaesthesia and monitoring

You will be given a general anaesthetic, which means you are completely unconscious and feel nothing during the surgery. Several lines and tubes are placed: a breathing tube into the windpipe, large intravenous lines for medications and fluids, lines into arteries to monitor blood pressure precisely, and a urinary catheter.

Cardiopulmonary bypass

Because both your heart and lungs are being removed, the function of these organs has to be taken over by a machine during the operation. A cardiopulmonary bypass machine, sometimes referred to as a heart-lung machine, circulates and oxygenates your blood while the surgeons work.

Removing the diseased organs

The surgeon opens the chest, usually through the breastbone. The diseased heart and lungs are carefully separated from the blood vessels, airway, and surrounding tissues and removed. Great care is taken to protect the nerves that run alongside these organs, particularly the phrenic nerves that control the diaphragm.

Implanting the donor organs

The donor heart and lungs, which have been kept cold and preserved during transport, are placed into the chest. The surgeon connects:

• The donor windpipe (trachea) to your own
• The donor aorta to your own aorta
• The donor right atrium or major veins to your own venous system

The connections are checked carefully for bleeding and proper alignment.

Restarting the heart and lungs

Once the connections are complete, blood is gradually allowed back into the new organs. The heart usually starts beating on its own or with a small electrical shock. The lungs are gently re-inflated and ventilated. The team carefully weans you off the bypass machine over time.

Closing the chest

Recovery timeline after heart-lung transplant: ① ICU — ventilator, close monitoring (days 1–14), ② transplant ward — physiotherapy, medication education (weeks 2–6), ③ early home recovery — frequent clinic visits, gradual activity (months 1–3), ④ building independence — improving exercise tolerance (months 3–6), ⑤ long-term recovery — return to work or study, settled routine (6–12 months).

*AI-generated image - for illustration only. Clinical accuracy is not guaranteed.

Recovery after a heart-lung transplant happens in stages and continues over many months. Most patients return to a meaningful level of independence, but the timeline is gradual.

Intensive care unit

Immediately after surgery, you will be cared for in a specialised intensive care unit (ICU). You will be on a ventilator for at least the first hours, sometimes longer, while the new lungs settle. The team will:

• Monitor heart rhythm, blood pressure, and oxygen levels continuously
• Adjust medications that support blood pressure and heart function
• Watch closely for bleeding, infection, and early rejection
• Begin immunosuppressive medications immediately
• Start gentle physiotherapy as soon as you are stable

Typical ICU stay is one to two weeks, but this varies widely.

Ward recovery

Once you are stable enough, you move to a transplant ward. Here, focus shifts to:

• Weaning off remaining tubes and drains
• Learning to take your immunosuppressive medications correctly
• Progressing physiotherapy and breathing exercises
• Eating, walking, and gradually returning to daily activities
• Education for you and your family about life after transplant

Total hospital stay is often around four to six weeks, sometimes longer if complications arise.

First months at home

After discharge, you will need to stay close to the transplant centre for regular follow-up. The first three months are the highest-risk period for rejection and infection, so visits to the clinic are frequent — sometimes more than once a week initially — and include blood tests, lung function tests, and sometimes biopsies. Energy returns slowly. Most people notice steady improvement in breathing and exercise tolerance over weeks and months.

Long-term recovery

By six to twelve months after surgery, many patients have returned to a substantially independent life: walking comfortably, doing household activities, exercising in moderation, and in many cases returning to work or study. Full recovery, in the sense of feeling settled with the new normal of life on immunosuppression, often takes a year or more.

Risks and Complications

Heart-lung transplantation carries significant risks, both in the short term around the operation and in the longer term. Your transplant team will discuss these in detail before you give consent. The most important categories are:

Early complications

• Bleeding. The surgery involves many vascular connections, and bleeding may require returning to the operating room.
• Primary graft dysfunction. The new lungs may not work well in the first hours or days, leading to low oxygen and the need for prolonged ventilator support.
• Heart rhythm problems. Abnormal rhythms can occur as the new heart settles.
• Kidney injury. The kidneys can be affected by the surgery, by medications, and by changes in blood flow.
• Stroke. Although uncommon, stroke is a recognised risk of any major cardiac surgery.

Rejection

Rejection is when your immune system recognises the new organs as foreign and attacks them. There are two main forms:

• Acute rejection can happen at any time but is most common in the first months. It is often detected early by routine tests before causing symptoms, and is usually treated successfully with adjustments to immunosuppression.
• Chronic rejection develops gradually over years. In the lungs, it most often takes the form of bronchiolitis obliterans syndrome, a scarring of the small airways that progressively limits breathing. In the heart, chronic rejection causes narrowing of the coronary arteries (cardiac allograft vasculopathy). Chronic rejection is a major long-term challenge of transplantation and a leading cause of late graft failure.

Chronic rejection in transplanted organs: ① healthy small airway (bronchiole) — open lumen, ② bronchiole narrowed by bronchiolitis obliterans syndrome, ③ healthy coronary artery — open lumen, ④ coronary artery narrowed by cardiac allograft vasculopathy.

*AI-generated image - for illustration only. Clinical accuracy is not guaranteed.

Infection

Because immunosuppressive medications weaken the immune system to prevent rejection, infections are a constant concern. Bacterial pneumonia, viral infections (such as cytomegalovirus), and fungal infections are all more common than in people not on immunosuppression. Preventive medications are usually given in the early months, and patients learn careful hygiene and food safety practices.

Medication side effects

Long-term immunosuppressive medications can cause:

• High blood pressure
• Kidney damage over time
• Diabetes
• Higher cholesterol
• Bone thinning (osteoporosis)
• Increased risk of certain cancers, particularly skin cancers and post-transplant lymphoproliferative disorder
• Tremor, mood changes, and sleep problems

Most of these are manageable with regular monitoring and additional medications when needed.

Survival

Heart-lung transplantation has improved over the decades, but it remains a high-risk operation with significant long-term mortality compared with the general population. International data from transplant registries suggest that survival is meaningful for many patients — with a significant proportion living several years and some living a decade or more — but outcomes vary widely depending on the underlying disease, the patient’s condition before transplant, and the centre’s experience. Your transplant team can give you the most accurate, personalised information based on your situation and their centre’s outcomes.

Life After a Heart-Lung Transplant

Life after a heart-lung transplant is deeply changed but, for many people, also profoundly improved. The most striking benefit is usually the relief from breathlessness. Patients who could not walk across a room before surgery often find themselves able to climb stairs, walk outdoors, and return to activities they had given up.

Medications

You will take immunosuppressive medications every day for the rest of your life. These typically include a combination of two or three drugs, with doses adjusted based on blood tests. Skipping doses, even occasionally, can trigger rejection, so reliable medication-taking is essential. You will also take preventive antibiotics, antiviral, or antifungal medications, especially in the first year.

Follow-up

Follow-up is intensive in the first year and continues lifelong. It includes:

• Regular clinic visits
• Blood tests to monitor medication levels, kidney function, and signs of infection
• Lung function tests
• Echocardiograms and other heart investigations
• Bronchoscopies and sometimes heart biopsies, especially in the first year, to look for rejection
• Cancer and bone health screening over the longer term

Daily life

With time, most patients can:

• Return to work, study, or caring responsibilities
• Walk, cycle, and exercise within recommendations
• Travel, with advance planning around medications and access to medical care
• Resume relationships, including sexual relationships, with their partner
• Eat a normal balanced diet, with some specific precautions around foods that carry infection risk

Pregnancy

Pregnancy after a heart-lung transplant is possible but considered high-risk, requiring careful planning, adjustment of medications, and close obstetric and transplant follow-up. Decisions about pregnancy are made together with the transplant team and a high-risk obstetric specialist.

Emotional and mental health

The emotional journey after transplant can be complex. Relief and gratitude often sit alongside anxiety about rejection, grief about the donor, frustration with side effects, and sometimes guilt at being “chosen”. Many transplant programmes include mental health support as a routine part of follow-up. Speaking with a counsellor or joining a transplant patient group can help.

Heart-Lung Transplant in Children

Heart-lung transplants in children are rare but are sometimes performed for severe congenital heart disease combined with pulmonary vascular disease, or for advanced cystic fibrosis with heart failure. Many of the same principles apply as in adults, but there are several differences:

• Donor matching. Donor organs must be appropriately sized for the child, which can make finding a match more difficult.
• Surgical considerations. Children with complex congenital heart disease may have had previous operations that make the transplant surgery more challenging.
• Growth and development. Immunosuppressive medications and chronic illness can affect growth, schooling, and emotional development. Paediatric transplant teams work closely with families to support all of these.
• Family involvement. Parents take on the day-to-day responsibility for medications, infection precautions, and clinic visits, and the whole family is involved in the care plan.
• Transition to adult care. Children who undergo transplant will eventually transition to adult transplant services, ideally through a structured handover process.

Paediatric heart-lung transplantation is performed at a small number of specialised centres with experience in both paediatric cardiac surgery and transplant medicine.

Frequently Asked Questions

Is a heart-lung transplant a cure?

A heart-lung transplant is not a cure in the strict sense. It replaces failing organs with healthier ones, but it also creates a new long-term medical situation: lifelong immunosuppression, regular follow-up, and ongoing risk of rejection and infection. For many patients, however, it offers a dramatic improvement in symptoms and quality of life that no other treatment can match.

How long does the surgery itself take?

The operation usually takes six to eight hours, though it can be longer in complex cases. The total time in the operating room, including anaesthesia and preparation, is longer still.

How long will I be in hospital?

Most patients spend one to two weeks in intensive care, followed by additional time on a transplant ward, with a total hospital stay of around four to six weeks. Complications can extend this.

Will I be able to feel the new heart beating?

Many patients become aware of their heartbeat in a different way after transplant, partly because the transplanted heart is not connected to the same nerves as the original. The new heart may respond more slowly to exercise initially, which the team will help you understand and manage.

How long is the waiting list?

Waiting times for a heart-lung transplant are unpredictable and can be long, because suitable donors are rare and both the heart and lungs must come from the same donor with the right size and blood type match. Your transplant centre can give you a sense of typical waits at their programme.

What happens if my body rejects the new organs?

Most acute rejection episodes are detected early through routine tests and treated successfully by adjusting immunosuppressive medications. Chronic rejection is harder to reverse and may progress over time, but treatments to slow it continue to improve. Reliable medication-taking and attending all follow-up appointments are the single most important things you can do to reduce rejection risk.

Can I exercise after a heart-lung transplant?

Yes, and regular physical activity is encouraged. Most patients participate in cardiac or pulmonary rehabilitation in the early months and then continue with walking, cycling, swimming, and similar activities. The transplant team will guide you on intensity and any limits.

Will I have to take medications forever?

Yes. Immunosuppressive medications continue for life. Doses may be reduced over time, but they are never stopped. Other medications to prevent infections, control blood pressure, protect bones, and manage side effects may also be needed, often long-term.

Can I travel after a transplant?

Most patients can travel once they are stable, usually after the first several months. Travel requires planning: carrying enough medication, knowing where to seek medical care if needed, avoiding regions with high infection risk during vulnerable periods, and discussing vaccinations in advance with your transplant team.

Conclusion

A heart-lung transplant is an extraordinary operation reserved for an extraordinary situation: end-stage disease of both the heart and the lungs, where no other treatment can offer meaningful help. For carefully selected patients, it can restore breath, energy, and a level of daily life that had seemed lost.

The journey is demanding at every stage — the evaluation, the wait, the surgery itself, and the lifelong follow-up that follows. It asks for resilience from the patient and from the family around them. Yet thousands of people around the world are living today because of this surgery, and continued advances in surgical technique, immunosuppression, and long-term care are gradually improving what is possible.

If you are being evaluated for a heart-lung transplant, the most important relationship in your care is the one with your transplant team. They know your full clinical picture, the options available at their centre, and the specific risks and likely benefits in your case. The information in this guide is intended to help you bring better questions and a clearer understanding to those conversations, so that the decisions you make are informed, considered, and your own.