Systemic lupus erythematosus (SLE) may involve the respiratory tract in several ways, such as through pleuritis, pneumonitis, interstitial disease or pulmonary hypertension. In rare cases, SLE patients present a syndrome characterized by dyspnea, chest pain and abnormalities in pulmonary function testing, although there may be no evidence of major parenchymal lung disease on computerized tomography scans. This condition has come to be known as shrinking lung syndrome. We report a case that meets these diagnostic criteria, emphasizing the pathogenesis proposed, as well as the therapeutic options available.

Keywords: Lupus Erythematosus/Systemic, Respiratory System, Shrinking Lung Syndrome

Alveolar hemorrhage leading to respiratory failure is uncommon. Various etiologies have been reported, including systemic lupus erythematosus, which generally presents as pulmonary-renal syndrome. It is believed that the pathogenesis of microangiopathy is related to deposits of immune complexes that lead to activation of cellular apoptosis. The authors report two cases of alveolar hemorrhage and respiratory failure, both requiring mechanical ventilation. The two cases had opposite outcomes after pharmacological therapy. The presence of anti-glomerular basement membrane antibodies in one of the cases demonstrates the multiplicity of physiopathological mechanisms that may be involved. This multiplicity of mechanisms provides a possible explanation for the heterogeneous responses to the available treatments.

Keywords: Lupus erythematosus systemic/etiology. Lupus nephritis/etiology. Respiratory insufficiency/complications.

The hypothesis that exposure to silica might be associated with a wide range of autoimmune diseases including SLE (systemic lupus erythematosus) has been discussed over the last decade, but only few cases of silicosis and SLE were described in the literature. The authors report the case of a male patient in his fifth decade of life, with previous exposure to silica, who worked as a well digger for ten years. The patient's clinical picture started with articular symptoms, sporadic peaks of fever, anemia, positive antinuclear factor, peripheral (1/10) and homogeneous (1/500) standard, and productive cough. Computed tomography of the chest showed a diffuse interstitial process, bilateral nodules, para-aortic and para-tracheal hilar calcifications, compatible with pulmonary and ganglial silicosis. He developed acute respiratory distress syndrome (ARDS) and died.

Keywords: Systemic lupus erythematosus. Silicosis. Autoimmune diseases.

Severe pulmonary hypertension is a debilitating disease with short life expectancy that often affects young people. Pleuropulmonary complications of systemic lupus erythematosus occur in 50-70% of patients. Severe symptomatic pulmonary hypertension in systemic lupus erythematosus is rare and carries a bad prognosis because a fatal outcome can occur within months. The authors describe, for the first time, a patient with systemic lupus erythematosus with severe pulmonary hypertension and secondary antiphospholipid syndrome who responded favorably to oral sildenafil, after unsuccessful use of prednisone, intravenous cyclophosphamide, warfarin and diltiazem.

Keywords: Vasodilator agents/therapeutic use. Lupus erythematosuos systemic. Antiphospholipid antibodies. Phosphodiesterase inhibitors.