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Letters to the editor
Endothelin in acute exacerbations of COPD
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We read with interest the article by Rolandet al 1 on endothelin-1 (ET-1) levels in exacerbations of chronic obstructive pulmonary disease (COPD). The authors found increased sputum levels of ET-1 in patients with COPD during an exacerbation and this was reflected by a smaller rise in venous ET-1 levels.
We have recently performed a study to …