Pleural and pulmonary involvement in systemic lupus erythematosus

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Summary

Systemic lupus erythematosus (SLE) is a rare complex autoimmune disease with a multisystem involvement. The clinical manifestations of this disease include an erythematous rash, oral ulcers, polyarthralgia, nonerosive arthritis, polyserositis, hematologic, renal, neurologic, pulmonary and cardiac abnormalties. The involvement of the respiratory system is frequent. Pleuro-pulmonary manifestations are present in almost half of the patients during the disease course and may be the presenting symptoms in 4–5% of patients with SLE. Complications directly associated to the disease include pleuritis with or without pleural effusion, alveolitis, interstitial lung disease, lupus pneumonitis, pulmonary hemorrhage, pulmonary arterial hypertension, and pulmonary thromboembolic disease. Complications due to secondary causes include pleuro-pulmonary manifestations of cardiac and renal failure, atelectasis due to diaphragmatic dysfunction, opportunistic pneumonia, and drug toxicity. The prevalence, clinical presentation, prognosis and response to treatment vary, depending on the pattern of involvement. As with other connective tissue diseases, early and specific therapeutic intervention may be indicated for many of these pleuro-pulmonary manifestations.

Section snippets

Pleural involvement

Pleural disease represents the most common intrathoracic manifestation of SLE, with pathologic evidence of pleuritis or pleural fibrosis in 50–83% of patients at autopsy and pleural effusion in 16–50% on chest radiographs. Pleural involvement may be the first manifestation of SLE and is commonly associated with pericarditis [5]. Clinically lupus pleuritis is characterized by chest pain, dyspnea, cough and possibly fever. Pleuritic pain can be present without radiographically detectable chest

Pulmonary infections

Patients with SLE are more susceptible to bacterial and opportunistic infections due to immunosuppressive therapy with glucocorticoids or an immunomodulatory agent as well as characteristic immunologic dysfunction including immunoglobulin deficiency, acquired and inherited complement deficiencies, defects in chemotaxis and phagocytosis and functional asplenia which may account for the increased susceptibility to pneumococcal and Salmonella sepsis [6], [7], [8], [9]. Underlying parenchymal

Acute pulmonary diseases

Acute lupus pneumonitis (ALP) and diffuse alveolar hemorrhage (DAH) are uncommon, acute life-threatening syndromes associated with SLE resulting from acute injury to the alveolar-capillary unit [20]. ALP occurs in 1–4% of patients with SLE. It can reveal a previously unknown SLE in up to 50% of patients or may occur in the course of the disease. The clinical presentation of ALP is non specific and is characterized by the sudden onset of fever, cough and dyspnea with hypoxemia and hypocapnia,

Chronic pulmonary diseases

Diffuse interstitial lung disease (ILD) is relatively less common in SLE than in other CTDs, although it may dominate the clinical picture in some patients. The involvement of the lung affects 3–8% of SLE patients, with a progressive increase in prevalence with disease duration [49], [50]. However, different high resolution computed tomography (HRCT) series have demonstrated a higher rate of ILD features (about one third of SLE patients), suggesting that subclinical lung disease is common [51],

Pulmonary embolism

SLE patients are at increased risk for coagulation problems. Pulmonary embolism should be suspected in patients who have antiphospholipid antibodies (aPL) with acute respiratory symptoms such as pleuritic chest pain and dyspnoea. Antiphospholipid antibodies are a family of acquired autoantibodies that are associated with vascular thrombosis and may be present in up to two thirds of patients with SLE [69], [70]. The two most well known and clinically important are the lupus anticoagulant (LA)

Pulmonary arterial hypertension

CTDs such as systemic sclerosis (SSc) and SLE can be complicated by severe pulmonary arterial hypertension (PAH) [76]. Previous studies have largely concentrated on SSc-associated PAH (SSc-PAH), with a disease prevalence estimated to be between 7.5 and 12% [77], [78]. Some degree of PHT complicates the course of SLE in 5–14% of the patients [79], [80], [81]. PHT prevalence and severity of disease in patients with SLE tend to increase with time [82]. Autopsy findings from patients with SLE and

Myopathies and muscle dysfunction

Shrinking lung syndrome (SLS) is a manifestation of SLE characterized by progressive dyspnea, the characteristic chest radiographic findings of small lung volumes, elevated hemidiaphragms and bibasilar atelectasis, with a restrictive ventilatory defect and a preserved carbon monoxide transfer coefficient. The exact prevalence of SLS in patients with SLE is unknown; occurrence has been described in 18 to 27% of patients [91], [92]. The pathogenesis of this condition is still not entirely known.

Conclusion

To conclude, pulmonary manifestations of lupus erythematosus are myriad. CT scan has emerged as a very useful tool in the early diagnosis and management of pulmonary diseases associated with SLE. The necessity of ruling out infection and establishing the diagnosis of acute pulmonary involvement such as alveolar haemorrhage, lupus pneumonitis, pulmonary embolism or acute alveolitis in ILD is vital as these conditions need immediate treatment and any delay can result in increased morbidity and

Conflicts of interests

None.

Glossary

aCL
anticardiolipin antibodies
ALP
acute lupus pneumonitis
aPL
antiphospholipid antibodies
APS
antiphospholipid syndrome
BAL
bronchoalveloar lavage
CAPS
catastrophic APS
CTD
connective tissue diseases
DAD
diffuse alveolar damage
DAH
diffuse alveolar hemorrhage
DLCO
carbon monoxide diffusing capacity
HRCT
high-resolution computed tomography
ILD
diffuse interstitial lung disease
LA
lupus anticoagulant
LIP
lymphocytic interstitial pneumonia
NSIP
nonspecific interstitial pneumonia
OP
organizing pneumonia
PAH
pulmonary arterial

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