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In page Systemic scleroderma:
"Some impairment in lung function is almost universally seen in patients with diffuse scleroderma on pulmonary function testing,[5] but it does not necessarily cause symptoms, such as shortness of breath. Some patients can develop pulmonary hypertension, or elevation in the pressures of the pulmonary arteries. This can be progressive, and can lead to right-sided heart failure. The earliest manifestation of this may be a decreased diffusion capacity on pulmonary function testing.[citation needed] Other pulmonary complications in more advanced disease include aspiration pneumonia, pulmonary hemorrhage and pneumothorax.[1]
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