Case-Based Review

Management of Late Pulmonary Complications After Hematopoietic Stem Cell Transplantation

2018 March/April;13(2):41-48

References

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Azithromycin is believed to exert an effect by its anti-inflammatory properties and perhaps by decreasing lung neutrophilia (it may be most beneficial in the subset of patients with high neutrophilia on bronchoalveolar lavage [BAL]).³⁰ Adverse effects of chronic azithromycin include QT prolongation, cardiac arrhythmia, hearing loss, and antibiotic-resistant organism colonization.^37,38

Other therapies include pulmonary rehabilitation, which may improve health-related quality of life and 6-minute walk distance,³⁹ extracorporeal photopheresis,⁴⁰ immunosuppression with calcineurin inhibitors or mycophenolate mofetil,^21,41 and lung transplantation.^42–44 A study with imatinib for the treatment of lung disease in steroid-refractory GVHD has shown promising results, but further validation with larger clinical trials is required.⁴⁵

Case Continued

The patient is diagnosed with BOS and is treated for several months with prednisone 40 mg/day weaned over 3 months. She is started on inhaled corticosteroids, a proton pump inhibitor, and azithromycin 3 times per week, but she has a progressive decline in FEV₁. She starts pulmonary rehabilitation but continues to functionally decline. Over the next year she develops bilateral pneumothoraces and bilateral cavitary nodules (Figure 1).

What is causing this decline and the radiographic abnormalities?

Spontaneous air leak syndrome has been described in a little more than 1% of patients undergoing HSCT and has included pneumothorax and mediastinal and subcutaneous emphysema.⁴⁶ It appears that air leak syndrome is more likely to occur in patients with chronic GVHD.⁴⁷ The association between chronic GVHD and air leak syndrome could explain this patient’s recurrent pneumothoraces. The recurrent cavitary nodules are suspicious for infectious etiologies such as nontuberculous mycobacteria, tuberculosis, and fungal infections.

Case Continued

During an episode of pneumothorax, the patient undergoes chest tube placement, pleurodesis, and lung biopsy. Pathology reveals bronchiolitis obliterans as well as organizing pneumonia (Figure 2). No organisms are seen on acid-fast bacilli or GMS stains.

What are the other late-onset noninfectious pulmonary complications?

Definitions of other late noninfectious pulmonary complications following HSCT are shown in Table 3.

Cryptogenic organizing pneumonia (COP) occurs less frequently than BOS but may also represent pulmonary GVHD, although this is less certain.¹⁶ Organizing pneumonia is a nonspecific pathologic finding associated with various lung diseases.⁴⁸ Clinically, COP resembles pneumonia with fevers, cough, migratory infiltrates, and restrictive lung disease, but there are no infectious organisms identified. It occurs in nontransplant patients as well; in these patients COP has been associated with many different inciting causes, although the etiology often is unknown.⁴⁹ COP responds to prolonged steroid treatment. It is usually treated with high-dose systemic steroids started at 1 mg/kg per day, with rapid weaning over a few weeks but prolonged to 6 months to 1 year.

Interstitial pneumonias may represent COP or may be idiopathic pneumonia syndrome with a later onset or a nonspecific interstitial pneumonia. This syndrome is poorly defined, with a number of differing definitions of the syndrome published in the literature.^50–55

A rare pulmonary complication after HSCT is pulmonary veno-occlusive disease (PVOD). Pulmonary hypertension has been reported after HSCT,⁵⁶ but PVOD is a subset of pulmonary hypertension. It is associated with pleural effusions and volume overload on chest radiography.^57,58 It may present early or late after transplant and is poorly understood.

Besides obstructive and restrictive PFT abnormalities, changes in small airway function⁵⁹ after transplant and loss in diffusing capacity of the lungs for carbon monoxide (Dlco) in the first 5 years after transplant have been reported, although these parameters improve by 10 years after transplant.⁶⁰ There do not appear to be any changes in responsiveness to methacholine.⁶¹ Losses in respiratory muscle strength (PiMax and PeMax after transplant) have been reported.⁶² Lower aerobic exercise capacity (Vo₂max) after pediatric HSCT has also been reported.⁶³

Case Conclusion

The patient’s lung function continues to worsen, but no infectious etiologies are discovered. Ultimately, she dies of respiratory failure caused by progressive bronchiolitis obliterans.

Conclusion

Late pulmonary complications occur frequently in patients who have undergone HSCT. These complications can be classified as infectious versus noninfectious etiologies. Late-onset complications are more common in allogeneic transplantations because they are associated with chronic GVHD. These complications can be manifestations of pulmonary GHVD or can be infectious complications associated with prolonged immunosuppression. Appropriate monitoring for the development of BOS is essential. Early and aggressive treatment of respiratory infections and diagnostic bronchoscopy with BAL can help elucidate most infectious causes. Still, diagnostic challenges remain and multiple causes of respiratory deterioration can be present concurrently in the post-HSCT patient. Steroid therapy remains the mainstay treatment for most noninfectious pulmonary complications and should be strongly considered once infection is effectively ruled out.