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Overall, readmission and death rates are substantial after noninvasive positive-pressure ventilation for chronic obstructive pulmonary disease, and risk factors for poor outcomes are identified.Chu CM, Chan VL, Lin AWN, et al. Readmission rates and life threatening events in COPD survivors treated with noninvasive ventilation for acute hypercapnic respiratory failure. Thorax. 2004;59:1020–1025.