Adult bronchiolitis surgery
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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1];Associate Editor(s)-in-Chief: Hadeel Maksoud M.D.[2]
Overview
Lung transplant is not the first-line treatment option for patients with adult bronchiolitis. Surgery is usually reserved for patients with untreatable and advanced stage lung disease.
Indications
- Lung transplant is not the first-line treatment option for patients with adult bronchiolitis. Surgery is usually reserved for patients with either:
- Clinically severe disease where medical therapy is ineffective.
- The risk of death from lung disease without transplantation is more than 50% within two years
- The likelihood of surviving at least 90 days after lung transplantation is more than 80%
- Absence of a non-respiratory comorbidity that would limit life expectancy in the first 5 years after transplant
- Acceptable social profile and support system
Contraindications
- Absolute contraindications include the following:
- Uncontrolled or untreatable pulmonary or extrapulmonary infection
- Active TB infection
- Malignancy within previous 2 years
- Significant comorbidity of other vital organs
- Significant coronary heart disease not treated by revascularization
- Untreatable bleeding diathesis
- Significant chest wall or spinal deformity expected to cause severe restriction after transplantation
- Grade II or III obesity with body mass index (BMI) ≥35 kg/m2
- Smoker
- Drug or alcohol dependency
- Unresolved psychosocial problems or noncompliance with medications
- Relative contraindications include the following:
- Age more than 65 years in association with low physiologic reserve or other relative contraindications
- Grade I obesity with body mass index (BMI) 30 to 34.9 kg/m2
- Severe or progressive malnutrition
- Severe with clinical manifestations of osteoporosis
- Previous cardiothoracic surgery
- Colonization or infection with highly resistant or highly virulent agents
- HIV positive patient
- Active hepatitis B or C infection
- Absence of a consistent social support system
Medical tests for potential transplant candidates
Patients who are being considered for lung transplantation undergo the following tests to ensure lung transplant success and the patients' clinical status:[1]
- Blood typing:
- The blood type of the recipient must match that of the donor due to certain antigens that are present on donated lungs.
- A mismatch of blood type can lead to a strong response by the immune system and subsequent rejection of the transplanted organs
- Tissue typing:
- Ideally, the lung tissue would also match as closely as possible between the donor and the recipient, but the desire to find a highly compatible donor organ must be balanced against the patient's immediacy of need
- Chest X-ray
- To verify the size of the lungs and the chest cavity
- Pulmonary function tests
- Ventilation/perfusion (V/Q) scan
- Electrocardiogram
- Cardiac catheterization
- Echocardiogram
Types of lung transplant
Lobe
A lobe transplant is a surgery where a lobe or the entire diseased lung is replaced by a healthy donor lung.
Single-lung
A single lung is transplanted and the donor has usually been pronounced brain dead.
Double-lung
Certain patients may require both lungs to be replaced.
Surgery
- While the precise details of surgery will depend on the exact type of transplant, there are many steps which are common to all of these procedures.
- Prior to operating on the recipient, the transplant surgeon inspects the donor lung(s) for signs of damage or disease.
- If the lung or lungs are approved, then the recipient is connected to an IV line and various monitoring equipment, including pulse oximetry.
- The patient will be given general anesthesia, and a machine will breathe for him or her.[2]
- It takes about one hour for the pre-operative preparation of the patient.
- A single lung transplant takes about four to eight hours, while a double lung transplant takes about six to twelve hours to complete.
- A history of prior chest surgery may complicate the procedure and require additional time.
Lobe
Single-lung
- In single-lung transplants, the lung with the worse pulmonary function is chosen for replacement.
- If both lungs function equally, then the right lung is usually favored for removal because it avoids having to maneuver around the heart, as would be required for excision of the left lung.[3]
- In a single-lung transplant the process starts out after the donor lung has been inspected and the decision to accept the donor lung for the patient has been made.
- An incision is generally made from under the shoulder blade around the chest, ending near the sternum.
- An alternate method involves an incision under the breastbone.[4]
- In the case of a singular lung transplant the lung is collapsed, the blood vessels in the lung tied off, and the lung removed at the bronchial tube.
- The donor lung is placed, the blood vessels reattached, and the lung reinflated.
- To make sure the lung is satisfactory and to clear any remaining blood and mucus in the new lung a bronchoscopy will be performed.
- When the surgeons are satisfied with the performance of the lung the chest incision will be closed.
Double-lung
- A double-lung transplant, also known as a bilateral transplant, can be executed either sequentially, en bloc, or simultaneously.
- Sequential is more common than en bloc.[3]
- This is effectively like having two separate single-lung transplants done.
- A less common alternative is the transplantation of both lungs en bloc or simultaneously.
- The transplantation process starts after the donor lungs are inspected and the decision to transplant has been made.
- An incision is then made from under the patient's armpit, around to the sternum, and then back towards the other armpit, this is known as a clamshell incision.
- In the case of a sequential transplant the recipients lung with the poorest lung functions is collapsed, the blood vessels tied off, and cut at the corresponding bronchi.
- The new lung is then placed and the blood vessels reattached.
- To make sure the lung is satisfactory before transplanting the other a bronchoscopy is performed.
- When the surgeons are satisfied with the performance of the new lung, surgery on the second lung will proceed.
- In 10% to 20% of double-lung transplants the patient is hooked up to a heart-lung machine which pumps blood for the body and supplies fresh oxygen.[5]
Risks
- Signs of rejection:[4]
- Fever
- Flu-like symptoms, including chills, dizziness, nausea, general feeling of illness
- Increased difficulty in breathing
- Worsening pulmonary test results
- Increased chest pain or tenderness
- In order to prevent transplant rejection and subsequent damage to the new lung or lungs, patients must take a regimen of immunosuppressive drugs.
- Patients will normally have to take a combination of these medicines in order to combat the risk of rejection.
- The immunosuppressive regimen is begun just before or after surgery.
- Usually the regimen includes cyclosporine, azathioprine and corticosteroids, but as episodes of rejection may reoccur throughout a patient's life, the exact choices and dosages of immunosuppressants may have to be modified over time.
- Sometimes tacrolimus is given instead of cyclosporine and mycophenolate mofetil instead of azathioprine.
- Chronic rejection, meaning repeated bouts of rejection symptoms beyond the first year after the transplant surgery, occurs in approximately 50% of patients.[6] Such chronic rejection presents itself as bronchiolitis obliterans, or less frequently, atherosclerosis.[6]
Prognosis
Transplanted lungs on average last 3 to 5 years before showing signs of failure.
References
- ↑ "Lung Transplant Evaluation: Required Tests". Cleveland Clinic. February 7 2003. Retrieved 2006-09-29. Check date values in:
|date=(help) - ↑ "What Is the Surgical Procedure?". American College of Chest Physicians. October 2005. Retrieved 2006-09-29.
- ↑ 3.0 3.1 "Lung Transplant". eMedicine. June 1 2006. Retrieved 2006-09-29. Check date values in:
|date=(help) - ↑ 4.0 4.1 "Lung Transplant". Aetna intelihealth. January 30 2006. Retrieved 2006-09-29. Check date values in:
|date=(help) - ↑ "Lung Transplant". Aetna intelihealth. January 30, 2006. Retrieved 2006-11-02.
- ↑ 6.0 6.1 Merck Manual 18th ed. p. 1377