LUNG TRANSPLANT

A lung transplant also called a lung transplantation procedure is a procedure where a lung or the lungs of an individual are replaced by healthier lungs from another individual. A Lung transplant is mostly offered to patients whose lungs are beyond repair. It has been established that a lung transplant is mostly successful for people with damaged lungs.

Indications for Lung Transplantation

Lung transplant is mainly indicated for patients with end-stage lung disease that is resistant to other interventions.

Some of the diseases that may benefit from a lung transplant include

Chronic Obstructive Pulmonary Disease with airflow limitation

Idiopathic pulmonary fibrosis

Cystic fibrosis

Pulmonary hypertension

Alpha-1 antitrypsin deficiency

Sarcoidosis

Congenital Lung Disease

Pulmonary vascular disease such as scleroderma and primary pulmonary hypertension.

All patients that are breathless, lack exercise tolerance, and require supplementary oxygen should consider a lung transplant.

Evaluation for Lung Transplant

There are different investigations that patients must undergo before being placed on the lungs transplant waiting list. The tests include;

Medical History and Physical Examination – This examination is mostly the starting point for most lung transplant candidates. The examination mainly aims to establish the extent of the lung disease as well as other comorbidities that a patient may have.

Pulmonary Function Tests – This test mainly aims to determine the amount of air a person inhales and exhales as well as the power of one’s lungs.

Chest X-ray/CT scan – This scan mainly helps determine how well the lungs are functioning.

Blood tests – The test mainly aims to determine the general wellbeing of the patient as well as his or her suitability for the transplant.

Heart evaluation – The heart and the lungs are the two most essential organs in the human body. Therefore, cardiac assessment is mandatory at this juncture to evaluate the wellbeing of the heart and ensure it is healthy enough to withstand transplant surgery. This examination may involve cardiac catheterization and echocardiography.

Psychosocial Evaluation – This test mainly aims to establish the psychological wellbeing of the patient to ensure that he or she is emotionally stable to undergo the transplant procedure.

Listing for Transplant. Patients who meet all the above requirements are placed on the lungs transplant listing. Type of Lung Transplant There are three types of lung transplant procedures, which include;

Single Lung Transplant – This transplant procedure is mainly indicated for patients with localized lung disease such as emphysema. This type of transplant procedure mostly involves transplanting either the left or the right lung; in most cases, however, it is the left lung that is transplanted. This type of transplant is suitable for patients with localized lung disease.

Double Lung Transplant – Unlike the single lung transplant procedure, the double lung transplant procedure mainly involves transplanting both of the patient’s lungs. In addition, this procedure is mainly indicated for patients with cystic fibrosis, idiopathic pulmonary fibrosis, and pulmonary hypertension.

Heart Lung Transplant – As the name suggests, this procedure generally involves transplanting both the heart and the lungs. The transplant is mainly indicated for patients with very severe heart and lung problems such as primary pulmonary hypertension. The Lung Transplantation Procedure A lung transplant procedure is generally a very complicated procedure that may last several hours. The lung transplant procedure mainly involves several steps including Anesthesia and incision, Removal of the patient’s lung(s), Lung implantation, and restoration of blood circulation.

The Lung transplant surgery is generally performed as follows;

Anesthesia and Incision – Similar to all other surgical procedures, anesthesia is administered to the patient. Thereafter, a clamshell incision or a sternotomy is made.

Removal of the Patient’s Lung(s) – The surgeon proceeds to remove the patient’s lung or lungs depending on whether it is a single or double lung transplant procedure.

Lung implantation – The surgeon proceeds to implant the donor lung or lungs into the patient’s chest cavity. The bronchi of the donor lung are then connected to the bronchi of the patient. The surgeon also connects the blood vessels and the pulmonary artery. The surgeon then clears the airway to ensure that there are no blockages.

Restoration of blood circulation – The surgeon then reconnects the blood vessels so that blood can flow into the donor lung(s) and allow it or them to start functioning properly. Post-Transplant Care Following Lung Transplantation There are several aspects of care that are vital to the wellbeing of a lung transplant recipient. They include;

Immunosuppression – Since the transplanted lung is a foreign organ, it is vital for the recipient to take immunosuppressant drugs for as long as possible to avoid transplant rejection. Immunosuppressant drugs have various adverse side effects since they basically work by reducing the activity of the body’s immune system. Therefore transplant recipients have to adhere to the recommended dose of immunosuppressant drugs to avoid transplant-related complications such as infections, malignancies, and other transplant-related complications.

Infection prevention and control measures.

Following a transplant, it is not uncommon for transplant recipients to experience infections due to transplant-related immunosuppression. Therefore, it is vital for transplant recipients to adhere to infection prevention and control measures to avoid transplant-related infections and their complications. In addition to the regular use of antibiotics, transplant recipients may also require anti-epileptic and anti-fungal drugs.

Regular follow-up – It is generally vital for transplant recipients to adhere to regular post-transplant follow-ups.

During these follow-ups, the doctor may prescribe certain medication to help the donor lungs function properly. Diagnostic tests such as pulmonary function tests, bronchoscopy, and chest x-ray may also be done during these regular follow-ups. Another crucial aspect of post-transplant follow-up is pulmonary rehabilitation.

Pulmonary rehabilitation generally helps transplant recipients learn how to lead normal lives after transplant surgery while also taking proper care of their lungs. Pulmonary rehabilitation is important in enabling transplant recipients to gain more knowledge on how to take better care of their lungs. Another very crucial aspect of post-transplant follow-up is psychosocial support.

Psychosocial support is very vital to all transplant recipients. Therefore, recipients should consider seeking psychosocial support services such as counselling and psychiatric help following a transplant. Risks and Complications of Lung Transplantation Lung transplant is a very risky procedure and as a result, there are numerous risks and possible complications following the transplant surgery. Some of the major risks and complications associated with a lung transplant include;

Rejection – Rejection is a very serious transplant-related complication that mainly occurs due to the body’s natural ability to recognize foreign substances and rejecting them, thereby initiating an immunological response against the transplanted organ. Lung transplant recipients should, therefore, be wary of the signs and symptoms of lung transplant rejection. Lung transplant rejection is arguably the most serious transplant-related complication following a lung transplant.

Infection – Infection is a transplant-related risk that is very common following a lung transplant. This is mainly because infection prevention and control mechanisms are compromised both by the transplant procedure and the immunosuppressant drugs that are used in transplant recipients for a very long time following the transplant surgery. The best infection control measure is the avoidance or prevention of infection. Infection can be prevented by adhering to the recommended antibiotic regimen.

Lung allograft dysfunction – Lung allograft dysfunction is a transplant-related complication that generally manifests in transplant recipients many years after a lung transplant procedure. Lung allograft dysfunction primarily occurs due to chronic rejection of the transplanted lung. Chronic rejection of the transplanted lung is usually characterized by various transplant-related complications including lung allograft dysfunction, infections, and other transplant-related problems.

Bleeding – Bleeding is a transplant-related risk that is very common following a lung transplant. However, bleeding following a lung transplant is easily controlled. Bleeding can either be controlled during or after the transplant procedure.

Cancer – Transplant recipients generally have an increased risk of developing cancer as compared to the general population. This is mainly because immunosuppressant drugs that are used following transplant surgery weaken the body’s ability to fight off various diseases including cancer. Transplant recipients are, therefore, more prone to developing malignancies than the general population. Some of the cancers that are commonly associated with transplant recipients include skin cancer and lymphoma.

Blood clots – Following a lung transplant procedure, patients generally have an increased risk of developing blood clots due to the transplant procedure as well as various other drugs that are administered during and after the transplant procedure. Survival Rates and Prognosis Survival rates following a lung transplant procedure have significantly improved over the years due to extensive research in the field of lung transplantation. On average, eighty-five to ninety percent of transplant recipients survive the first year following a lung transplant, fifty to sixty percent survive the fifth year following a lung transplant procedure, and thirty to forty percent survive the tenth year following a lung transplant procedure.

Survival rates and prognosis following a lung transplant procedure depend on various factors including the type of lung disease, the age of the recipient, the general wellbeing of the recipient, the experience of the transplant center, and the general quality of post-transplant care that is availed to the recipient. Conclusion A lung transplant is generally a life-saving procedure for patients who are beyond other forms of treatment for lung diseases. Lung transplantation has been established to be beneficial for most patients who have undergone the procedure for severe lung damage. Patients who undergo a lung transplant procedure, however, have to take immunosuppressant drugs for the rest of their lives to ensure that their bodies do not reject the transplanted lungs. Although there are various risks and possible complications following the transplant procedure, it remains an effective procedure for most transplant recipients.