“…Mortality in patients treated with CPAP ranged from 14-24% [252,256,264,265,268,271] to 43-55% [254,260], although possibly reaching 84% when CPAP was the ceiling treatment [276]. Mortality in patients treated with NIV was reported in five studies and ranged from 5% to 52% (but reaching 86% in DNI patients) [261,263,269,272,274]. Pooling outcomes for the CPAP and NIV groups, Avdeev and colleagues estimated a mortality of 23% [255], and Bellani and colleagues estimated a mortality of 25% [270], while pooled results from Burns et al reported a 50% mortality among DNI patients [257].…”