5Hill NS. Complications of noninvasive positive pressure ventilation[J]. Respir Care, 1997,42(3) :431-432.
6Nava S, Ambrosino N,Clini E, et al. Noninvasive mechan- ical ventilation in the weaning of patients with respiratory failure due to chronic obstructive pulmonary disease. A randomized, controlled trial [J].Ann Intern Med, 1998, 128(9) :72-77.