A 52-year-old man on ICU has severe ARDS. The team measures his dead space fraction (VD/VT) as 0.72. According to Nuckton et al. (2002), what is the prognostic significance of this value?AA VD/VT of 0.72 is normal and has no prognostic significanceBAn elevated VD/VT (>0.60) is independently associated with increased mortality in ARDS - each 0.05 increase in VD/VT increases the odds of death by approximately 45%CVD/VT only predicts ventilator duration, not mortalityDOnly VD/VT values >0.90 are prognostically significantEDead space fraction has been invalidated as a prognostic markerCheck my answer