Case-Based Review

Management of Early Pulmonary Complications After Hematopoietic Stem Cell Transplantation

2018 January/February;13(1):36-48

References

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Diffuse Alveolar Hemorrhage

DAH is clinical syndrome consisting of diffuse alveolar infiltrates on pulmonary imaging combined with progressively bloodier return per aliquot during BAL in 3 different subsegments or more than 20% hemosiderin-laden macrophages on BAL fluid evaluation. Classically, DAH is defined in the absence of pulmonary infection or cardiac dysfunction. The pathophysiology is thought to be related to inflammation of pulmonary vasculature within the alveolar walls leading to alveolitis. Although no prospective trials exist, early use of high-dose corticosteroid therapy is thought to improve outcomes;^64,65 a recent study, however, showed low-dose steroids may be associated with the lowest mortality.⁶⁶ Mortality is directly linked to the presence of superimposed infection, need for mechanical ventilation, late onset, and development of multiorgan failure.⁶⁷

Idiopathic Pneumonia Syndrome

IPS is a complex clinical syndrome whose pathology is felt to stem from a variety of possible lung insults such as direct myeloablative drug toxicity, occult pulmonary infection, or cytokine-driven inflammation. The ATS published an article further subcategorizing IPS as different clinical entities based upon whether the primary insult involves the vascular endothelium, interstitial tissue, and airway tissue, truly idiopathic, or unclassified.⁶⁸ In clinical practice, IPS is defined as widespread alveolar injury in the absence of evidence of renal failure, heart failure, and excessive fluid resuscitation. In addition, negative testing for a variety of bacterial, viral, and fungal causes is also necessary.⁶⁹ Clinical syndromes included within the IPS definition are ARDS, acute interstitial pneumonia, DAH, cryptogenic organizing pneumonia, and BOS.⁷⁰ Risk factors for developing IPS include TBI, older age of recipient, acute GVHD, and underlying diagnosis of AML or myelodysplastic syndrome.¹² In addition, it has been shown that risk for developing IPS is lower in patients undergoing allogeneic HSCT who receive non-myeloablative conditioning regimens.⁷¹ The pathologic finding in IPS is diffuse alveolar damage. A 2006 study in which investigators reviewed BAL samples from patients with IPS found that 3% of the patients had PCR evidence of human metapneumovirus infection, and a study in 2015 found PCR evidence of infection in 53% of BAL samples from patients diagnosed with IPS.^72,73 This fuels the debate on whether IPS is truly an infection-driven process where the source of infection, pulmonary or otherwise, simply escapes detection. Various surfactant proteins, which play a role in decreasing surface tension within the alveolar interface and function as mediators within the innate immunity of the lung, have been studied in regard to development of IPS. Small retrospective studies have shown a trend toward lower pre-transplant serum protein surfactant D and the development of IPS.⁷⁴

The diagnosis of IPS does not require pathologic diagnosis in most circumstances. The correct clinical findings in association with a negative infectious workup lead to a presumptive diagnosis of IPS. The extent of the infectious workup that must be completed to adequately rule out infection is often a difficult clinical question. Recent recommendations include BAL fluid evaluation for routine bacterial cultures, appropriate viral culture, and consideration of PCR testing to evaluate for Mycoplasma, Chlamydia, and Aspergillus antigens.⁷⁵ Transbronchial biopsy continues to appear in recommendations, but is not routinely performed and should be completed as the patient’s clinical status permits.^8,68Table 3 reviews basic features of early noninfectious pulmonary complications.

Treatment of IPS centers around moderate to high doses of corticosteroids. Based on IPS experimental modes, tumor necrosis factor (TNF)-α has been implicated as an important mediator. Unfortunately, several studies evaluating etanercept have produced conflicting results, and this agent’s clinical effects on morbidity and mortality remain in question.⁷⁶

What treatment should be offered to the patient with diffuse alveolar damage on biopsy?

Treatment consists of supportive care and empiric broad-spectrum antibiotics with consideration of high-dose corticosteroids. Based upon early studies in murine models implicating TNF, pilot studies were performed evaluating etanercept as a possible safe and effective addition to high-dose systemic corticosteroids.⁷⁷ Although these results were promising, data from a truncated randomized control clinical trial failed to show improvement in patient response in the adult population.⁷⁶ More recent data from the same author suggests that pediatric populations with IPS are, however, responsive to etanercept and high-dose corticosteroid therapy.⁷⁸ When IPS develops as a late complication, treatment with high-dose corticosteroids (2 mg/kg/day) and etanercept (0.4 mg/kg twice weekly) has been shown to improve 2-year survival.⁷⁹

Case Patient 2 Conclusion

The patient is started on steroids and makes a speedy recovery. He is successfully extubated 5 days later.

Conclusion

Careful pretransplant evaluation, including a full set of pulmonary function tests, can help predict a patient’s risk for pulmonary complications after transplant, allowing risk factor modification strategies to be implemented prior to transplant, including smoking cessation. It also helps identify patients at high risk for complications who will require closer monitoring after transplantation. Early posttransplant complications include infectious and noninfectious entities. Bacterial, viral, and fungal pneumonias are in the differential of infectious pneumonia, and bronchoscopy can be helpful in establishing a diagnosis. A common, important noninfectious cause of early pulmonary complications is IPS, which is treated with steroids and sometimes anti-TNF therapy.