Time intervals presented in units of hours from presentation. HR = heart
rate (beats/minute); Fset=mandatory respiratory rate
(breaths/minute); Ftot = total respiratory rate
(breaths/minute); Vt = tidal volume; PS = pressure
support applied to spontaneous breaths; PEEP = positive end-expiratory
pressure; PIP = peak inspiratory pressure; C = static compliance;
Cwt = static compliance indexed for body weight in
kilograms; I:E ratio = inspiratory to expiratory ratio;
FiO2 = fractional inspired oxygen concentration;
SpO2 = pulse oximetry; ETCO2 = end-tidal
carbon dioxide; PvCO2 = venous carbon dioxide tension;
PaCO2 = arterial carbon dioxide tension;
PaO2 = arterial oxygen tension; P:F ratio =
PaO2:FiO2 ratio. * = prior to adopting
ARDSnet settings; ** = immediately prior to extubation.
Table 4 - Positive end-expiratory pressure and fractional
inspired oxygen settings used, adapted from the ARDSnet
trial.10