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Letters to the editor
Non-invasive ventilation
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We read with interest the recent paper published in Thorax by Plant et al1 which analysed predictors of the outcome of non-invasive ventilation (NIV) in patients with acute exacerbations of chronic obstructive pulmonary disease. Few data are available on this important question, and studies specifically designed to propose answers are either retrospective2 or have been performed in a small sample of patients.3 We recently published the results of a trial …