5Scala R, Nava S, Conti G, et al. Noninvasive versus conventional venti- lation to treat hypercapnic eneephalopathy in chronic obstructive pul- monary disease. Intensive Care Med ,2007,33:2101-2108.
6Borghi-Silva A, Reis MS, Mendes RG, et al. Noninvasive ventilation a- cutely modifies heart rate variability in chronic obstructive pulmohary disease patients. Respir Med ,2008,102 : 1117-1123.
7Lee TA, Pickard AS, Au DH, et al. Risk for death associated with med- ications for recently diagnosed chronic obstructive pulmonary disease. Ann Intern ,2008,149:380-390.
10Lee TA, Pickard AS, Au DH, et al. Risk of Death Associated with Medi cations for Recently Diagnosed Chronic Obstructive Pulmonary Disease[J]. Annals of Internal Medicine,2008,149: 380-390.