A lung transplant is a multi-stage process that begins months before surgery and continues for the rest of the recipient’s life. The operation itself typically lasts six to twelve hours, during which a surgeon removes one or both diseased lungs and connects donor lungs by stitching together the airway, pulmonary artery, and a cuff of heart tissue. But the surgical procedure is only the middle chapter. Before it comes a rigorous evaluation, a wait for a suitable donor organ, and careful preservation of that organ during transport. After it come intensive care, a lifelong immunosuppression regimen, and rehabilitation. Each stage carries its own risks and decision points, and understanding them helps make sense of why the process is so involved.
Who Qualifies and When They Get Listed
Not everyone with severe lung disease is a candidate. Transplant teams evaluate a wide range of factors before putting someone on the waiting list. A full workup covers the severity of the underlying lung disease, nutritional status, degree of frailty, other medical conditions that could complicate surgery or recovery, mental health and social support, and health behaviors like smoking or medication adherence.1Journal of Heart and Lung Transplantation. Consensus document for the selection of lung transplant candidates: An update from the International Society for Heart and Lung Transplantation The timing of that evaluation depends on how quickly the disease is progressing and how long the expected wait for a donor organ will be. Someone with a rare tissue type, for instance, may face a longer wait and need to be listed earlier.
The most common conditions that lead to lung transplant include chronic obstructive pulmonary disease (COPD), idiopathic pulmonary fibrosis, cystic fibrosis, and pulmonary arterial hypertension. The goal is to identify patients who are sick enough that they will not survive long without a transplant but healthy enough to survive the surgery and the demanding recovery period. That narrow window is one reason the evaluation process is so thorough.
How Donor Lungs Are Matched and Allocated
Once listed, a patient enters the organ allocation system. In the United States, a scoring system called the Composite Allocation Score (CAS) determines who receives available lungs. The CAS replaced the older Lung Allocation Score and shifted from a rigid hierarchical ranking to a continuous scoring framework that weighs medical urgency, expected benefit from transplant, distance from the donor hospital, and other factors. Its modular design allows adjustments over time to reflect evolving priorities.2PubMed Central. Impact of the Composite Allocation Score on Lung Transplant Waitlist and Posttransplant Outcomes
On the donor side, the traditional “ideal” lung donor criteria were established in the 1980s and included an age between 25 and 40, no smoking history, a clear chest X-ray, and clean bronchoscopy findings. In practice, donors who meet every one of those criteria are rare. Over the past couple of decades, research has shown that many of those strict cutoffs do not actually predict worse outcomes for recipients. Donors aged 18 to 64 produce acceptable results. Cold storage times beyond six hours have not been linked to higher recipient mortality. Even lungs from donors with a smoking history, while they may slightly reduce survival, still offer a lifesaving opportunity for patients who would otherwise keep waiting.3PubMed Central. Lung donor selection criteria The broadening of acceptable donor criteria has been essential because the demand for donor lungs far exceeds supply.
Preserving the Organ During Transport
Once donor lungs are retrieved, the clock starts. Standard practice involves flushing them with a cold preservation solution and storing them on ice at roughly 4°C, which slows cellular metabolism and limits damage. Under this method, the accepted preservation window is about six to eight hours.4ClinicalTrials.gov. 10°C vs 4°C Lung Preservation RCT That time constraint limits how far donor lungs can travel, effectively putting geographic distance between donor and recipient at the center of every allocation decision.
Newer approaches are pushing those limits. Controlled hypothermic storage devices maintain lungs at a slightly warmer temperature, around 7 to 9°C, which avoids the freezing injury that can occur with ice. A multicenter study found that this approach allowed safe ischemic times exceeding 15 hours in a small group of recipients.5PubMed. Extended ischemic time (>15 hours) using controlled hypothermic storage in lung transplantation: A multicenter experience If validated in larger studies, this could dramatically expand the geographic pool of usable donor organs.
Another technique, ex vivo lung perfusion (EVLP), goes a step further. Instead of just keeping the lungs cold, EVLP circulates a nutrient solution through them at body temperature, allowing the transplant team to assess and even recondition marginal donor lungs before implanting them. Research shows that marginal lungs undergoing EVLP exhibit more inflammation, clotting activity, and endothelial damage than standard-criteria lungs, but that these problems may be treatable during the perfusion process itself with targeted therapies.6PubMed Central. Biomarkers of standard criteria and marginal donor lungs during ex vivo lung perfusion: A comparative study EVLP has been one of the most significant advances in the field, allowing the use of lungs that previously would have been discarded.
Anesthesia and Getting Ready for Surgery
Lung transplant anesthesia is among the most complex in all of surgery. The patient arrives with end-stage lung disease, meaning their ability to tolerate even routine anesthetic steps like going on a ventilator is already compromised. Several critical moments during the operation demand close vigilance: induction of anesthesia, switching to one-lung ventilation so the surgeon can work on the other side, clamping and then unclamping the pulmonary artery, and the moment blood first flows into the new lung.7PubMed Central. A Review of Anesthesia for Lung Transplantation
Most centers place an arterial line before inducing anesthesia so they can detect blood pressure changes immediately. Monitoring typically includes transesophageal echocardiography (a small ultrasound probe placed in the esophagus to watch the heart in real time) and a catheter threaded into the pulmonary artery. These tools let the anesthesiologist track how the right side of the heart is handling the stress, since one-lung ventilation and pulmonary artery clamping both put heavy strain on the right ventricle.8Anesthesia and Pain Medicine. Anesthetic considerations for lung transplantation
When the Heart Needs Mechanical Help
Some patients cannot maintain stable circulation during surgery on their own. Historically, cardiopulmonary bypass (CPB) was used to take over the work of the heart and lungs while the surgeon operated. More recently, extracorporeal membrane oxygenation (ECMO) has largely replaced CPB for this purpose, and the data strongly favor the switch. In one five-year analysis, patients supported with ECMO during transplant had shorter ICU stays (a median of five days versus about twelve and a half for CPB), shorter overall hospital stays, and substantially lower in-hospital mortality: roughly 3% compared to 16%.9The Journal of Heart and Lung Transplantation. Five-year experience with intraoperative extracorporeal membrane oxygenation in lung transplantation: Indications and midterm results
A broader review of the literature confirmed that CPB is associated with more blood transfusions, higher rates of kidney injury requiring dialysis, more frequent reintubation, and worse survival at every time point compared to ECMO.10PubMed Central. Intraoperative Extracorporeal Support during Lung Transplantation: Not Just for the High-Risk Patient Another study found that CPB was an independent risk factor for in-hospital death even after adjusting for other variables, with one-year survival of 81% in the ECMO group versus 56% in the CPB group.11The Journal of Thoracic and Cardiovascular Surgery. Lung transplantation on cardiopulmonary support: Venoarterial extracorporeal membrane oxygenation outperformed cardiopulmonary bypass As a result, many transplant centers now use ECMO as their default when mechanical support is needed intraoperatively.
The Incision and the Connections
For a bilateral (double) lung transplant, two main approaches exist. The traditional clamshell thoracotomy involves a large incision running beneath both breasts, crossing the front of the chest, and cutting through the lower part of the sternum. This gives the surgeon wide access and allows central cannulation for circulatory support if needed. The alternative is bilateral anterolateral thoracotomies: two smaller incisions, one on each side, made through the fourth or fifth rib space. This approach leaves the sternum intact and connects any needed circulatory support through the femoral vessels in the groin instead.12PubMed Central. Anterolateral vs. Clamshell Thoracotomy for Bilateral Lung Transplantation Single lung transplants require only one incision on the side being operated on.
Once inside, the surgeon removes the diseased lung and then makes three critical connections to the donor lung. The order at many centers is bronchus first, then pulmonary artery, then the left atrial cuff (a patch of tissue connecting the pulmonary veins to the heart). The bronchial connection is typically done with an absorbable running suture. If the donor and recipient airways differ significantly in size, a telescoping technique is used where one end is slipped inside the other by the depth of one cartilage ring. The pulmonary artery is sewn with a fine running suture and filled with a blood-thinning solution before the knot is tied. The atrial cuff suture uses a technique that folds the tissue outward along the back wall to reduce the risk of blood clots forming along the stitch line.13Journal of Chest Surgery. Technical Aspects of Lung Transplantation: General Considerations For a double transplant, this entire sequence is performed twice, once for each side.
Single Versus Double Lung Transplant
The choice between replacing one lung or both depends on the underlying disease, the patient’s overall fitness, and practical considerations like donor availability. In older adults, a propensity-matched analysis found that single lung transplant recipients had shorter hospital stays (14 versus 18 days), lower reintubation rates, and less need for post-operative dialysis. Early survival was essentially identical between the two groups. But five-year survival favored double lung transplant: about 53% compared with 45% for single.14PubMed Central. Single vs Double Lung Transplantation in Older Adults: A Propensity-Matched Analysis The tradeoff is real: a single transplant is a less grueling operation with easier recovery, but the remaining native lung can develop infections or cancer and contributes to lower long-term survival.
Disease type matters too. For patients with idiopathic pulmonary fibrosis, a double transplant was associated with a median graft survival roughly 15 months longer than a single transplant. For COPD patients, the difference was much smaller and not statistically significant.15PubMed. Single- vs double-lung transplantation in patients with chronic obstructive pulmonary disease and idiopathic pulmonary fibrosis since the implementation of lung allocation based on medical need This means the decision is genuinely individualized. A 70-year-old with COPD may do perfectly well with a single transplant, while a younger patient with pulmonary fibrosis is more likely to benefit from replacing both lungs.
The First Days in Intensive Care
After the chest is closed, the patient goes to the ICU on a ventilator. The most feared early complication is primary graft dysfunction, or PGD, a form of lung injury that develops within the first 72 hours. It looks like severe pulmonary edema: the new lungs fill with fluid, and oxygen levels drop. PGD results from the combination of ischemia during organ storage and the sudden rush of blood back into the tissue (reperfusion), which triggers an inflammatory cascade.16PubMed Central. Primary graft dysfunction Mild PGD is common and typically resolves with supportive care. Severe PGD can require placing the patient back on ECMO and, in the worst cases, can be fatal.
Getting off the ventilator quickly is a priority. Prolonged intubation in these immunocompromised patients is a major risk factor for hospital-acquired pneumonia and longer ICU stays. Some centers use noninvasive ventilation, delivered via a face mask, to bridge patients who are not quite ready for full independence from respiratory support. This approach can shorten the weaning period and help avoid the need for reintubation.17PubMed. Noninvasive ventilation in postoperative care of lung transplant recipients
Immunosuppression for Life
Because the transplanted lungs are foreign tissue, the recipient’s immune system will attack them unless held in check by medication. Immunosuppression typically involves a combination of drugs: one to prevent T-cell activation, one to block cell division, and a corticosteroid to broadly dampen inflammation. These categories have been standard for decades, but the specific agents and doses are increasingly tailored to the individual patient. Factors like kidney function, infection history, and how the patient metabolizes certain drugs all influence which combination a transplant team selects.18PubMed Central. Individualizing immunosuppression in lung transplantation
Even with good immunosuppression, rejection can occur. Acute rejection, most common in the first year, is usually detected through routine biopsies of the transplanted lung and treated by temporarily intensifying the drug regimen. Antibody-mediated rejection is a more complex diagnosis that requires the presence of clinical symptoms, donor-specific antibodies in the blood, and specific findings on lung biopsy.19PubMed. Antibody-Mediated Rejection in Lung Transplantation: Clinical Outcomes and Donor-Specific Antibody Characteristics Immunosuppression is a lifelong balancing act: too little and the body rejects the lungs, too much and infections or cancers become more likely.
Chronic Rejection and Long-Term Lung Function
The biggest threat to long-term survival after lung transplant is chronic lung allograft dysfunction, or CLAD. This umbrella term covers several distinct patterns of scarring and inflammation that cause the transplanted lung to lose function over time. The most common form, bronchiolitis obliterans syndrome, involves progressive narrowing of the small airways by scar tissue, leading to worsening airflow obstruction. A second pattern, restrictive allograft syndrome, involves stiffening of the lung tissue itself and carries a worse prognosis. Up to about 30% of CLAD patients develop this restrictive pattern.20The Journal of Heart and Lung Transplantation. Chronic lung allograft dysfunction: Definition, phenotypes, and clinical management—A consensus report from the Pulmonary Council of the International Society for Heart and Lung Transplantation
The science here is still actively evolving. Recent work has identified two distinct populations of immune cells (macrophages) that drive these different patterns. One type promotes inflammation and is found in both forms of CLAD. The other drives fibrosis, the formation of scar tissue, and is selectively enriched in the restrictive form.21PubMed Central. Identification and characterization of inflammatory LILR and fibrotic SPP1 macrophages in chronic lung allograft dysfunction These findings suggest that future treatments may need to target the specific type of CLAD a patient develops rather than treating all chronic rejection the same way. For now, treatment options remain limited, and CLAD is the primary reason that five-year survival after lung transplant hovers well below that of other solid organ transplants.
Rehabilitation and Quality of Life After Transplant
Recovery extends far beyond the hospital discharge. Pulmonary rehabilitation programs, which combine exercise training with education and psychological support, are a core part of post-transplant care. Studies show that outpatient rehabilitation after lung transplant significantly improves quality of life scores and reduces symptoms of anxiety and depression.22PubMed Central. Pulmonary rehabilitation in lung transplantation: Its effects on pulmonary function, physical fitness, and quality of life That said, rehabilitation does not prevent all complications. Surgical wound issues, opportunistic infections (a constant risk given the immunosuppression), and episodes of acute rejection still occur even in patients actively participating in rehabilitation programs.
For many recipients, the improvement in daily function is dramatic. People who could not walk across a room without supplemental oxygen may return to exercise, work, and travel. The adjustment is not purely physical, though. The psychological burden of lifelong medication, frequent clinic visits, and the knowledge that the transplanted lungs have a limited lifespan can weigh heavily. Transplant centers with integrated mental health support tend to produce better adherence to medication and follow-up, both of which directly affect survival.
Living-Donor Lung Transplants
Most lung transplants use organs from deceased donors, but a smaller number involve living donors. In living-donor lobar lung transplantation, typically two healthy volunteers each donate a lower lobe of one lung. The two lobes are then implanted into the recipient in place of the diseased lungs. This approach was first performed at Stanford in 1990 and has been most extensively developed in Japan, where deceased-donor organ availability has historically been limited.23PubMed Central. History of lung transplantation
The outcomes are surprisingly good. One Japanese center performing both types reported five-year survival rates of 83% after living-donor transplants and 74% after deceased-donor transplants, both well above the roughly 55% global average.24JMA Journal. Living-donor Lobar Lung Transplantation – Initiation and Development – Secondary Publication There were no operation-related deaths among living donors, and all resumed their previous lifestyles. For double lung transplants specifically, living-donor procedures had shorter cold ischemic times, faster implantation, and lower rates of primary graft dysfunction compared to deceased-donor transplants, though they required more platelet transfusions.25The Journal of Heart and Lung Transplantation. Living-donor lobar lung transplantation vs deceased-donor lung transplantation: Outcomes and evaluation The main limitation is that each donor loses a lobe permanently, so precise size matching between the donated lobes and the recipient’s chest cavity is critical. This procedure remains rare outside of Japan but represents an important option for critically ill patients who cannot afford to wait for a deceased donor.
Transplant in Children and Infants
Pediatric lung transplant carries unique challenges. Infants listed for transplant face particularly long waits because of the scarcity of size-matched donors. Of 128 infants listed between 1995 and 2011, more than 40% died while waiting. One-year and five-year survival rates for infants who do receive a transplant are about 61% and 43%, respectively. But here is an encouraging nuance: infants who make it through the first year post-transplant do considerably better than older children, with 85% alive at three years and 66% at five years.23PubMed Central. History of lung transplantation The first year is the gauntlet. Those who survive it have some of the best long-term outcomes in all of pediatric transplant.
Surgical considerations in infants include the extreme size mismatch between available donor organs and the tiny recipient chest, the relative immaturity of the immune system (which paradoxically can sometimes work in the patient’s favor by reducing rejection risk), and the need for growth of the transplanted tissue. Some centers have used lobar transplants from adult deceased donors to address the size problem, trimming a single adult lobe to fit an infant’s chest. These cases push the boundaries of surgical technique and remain concentrated at a small number of specialized centers worldwide.
How the Field Got Here
Lung transplantation has one of the more turbulent histories in surgery. The first experimental attempts were performed in animals by the Russian surgeon V.P. Demikhov in 1947. The first human lung transplant was done by James Hardy in Mississippi in 1963; the patient survived 18 days.26PubMed Central. Historical perspectives of lung transplantation: connecting the dots Over the next two decades, 45 lung transplants were attempted worldwide. Only one recipient, transplanted in Belgium by Fritz Derom in 1968, survived longer than a few weeks, living about ten and a half months.27Transplantation Proceedings. History of Lung and Heart-Lung Transplantation, With Special Emphasis on German-Speaking Countries
The breakthrough came with cyclosporine, an immunosuppressive drug that transformed all of organ transplantation. The Stanford group performed the first successful heart-lung transplant in 1981, and in 1983 the Toronto group achieved the first long-term surviving single lung transplant; that patient lived nearly seven years. Toronto followed with the first long-term double lung transplant in 1986, and in 1990 the first lobar transplant from a living donor was performed at Stanford.23PubMed Central. History of lung transplantation The modern technique of sequential bilateral transplantation, where each lung is replaced one at a time through separate bronchial connections rather than a single tracheal one, was originally described in an animal model in 1950 but was not adopted clinically until 1990. Since then, the field has been shaped by the introduction of allocation scoring systems, ECMO as a bridge to transplant, donation after cardiac death, and ex vivo lung perfusion. Each of these advances addressed a specific bottleneck, whether that was fairness in organ distribution, the shortage of usable donor organs, or keeping the sickest patients alive long enough to receive one.