Chu CM, Chan VL, Lin AW, et al : Readmission rates and life threatening events in COPD survivors treated with non-invasive ventilation for acute hypercapnic respiratory failure. Thorax. 2004 ; 59 : 1020-5.
Ai-Ping C, Lee KH, Lim TK : In-hospital and 5-year mortality of patients treated in the ICU for acute exacerbation of COPD : a retrospective study. Chest. 2005 ; 128 : 518-24.
Vitacca M, Bianchi L, Barbano L, et al : Effects of acute on chronic respiratory failure on hypercapnia and 3-month survival. Chest. 2005 ; 128 : 1209-15.