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Table 3 Data of respiratory mechanics at day 1 and day 3 after ICU admission

From: Expiratory flow limitation in intensive care: prevalence and risk factors

VariablesDay 1Day 3
NO EFL (n = 84)EFL (n = 37)p valueNO EFL (n = 63)EFL (n = 58)p value
Cst,rs, ml/cmH2O49 [40–64]47 [38–56]0.30948 [39–61]52 [39–56]0.652
Rrs,max, cmH2O/l/s16 [13–21]22 [17–26]< 0.000117 [15–20]21 [17–27]0.031
Rrs,min, cmH2O/l/s8 [6–12]9 [7–13]0.2699 [7–13]9 [7–14]0.825
ΔRrs, cmH2O/l/s7 [5–10]10 [6–14]0.0017 [5–10]11 [6–14]0.008
P/F ratio257 [177–370]168 [123–260]0.003230 [170–329]183 [134–265]< 0.0001
PEEPi, cmH2O2 [1–2]7 [4–10]< 0.00011 [0–2]6 [4–9]< 0.0001
PEEPappl, cmH2O7 [6–8]10 [8–12]< 0.00018 [6–10]10 [8–12]< 0.0001
RR, breaths/min15 [14–18]15 [14–16]0.83915 [14–17]16 [15–20]0.065
VT, ml/kg IBW7.3 [6.7–7.3]8.0 [7.0–8.9]0.0987.2 [6.4–8.0]7.3 [6.1–7.9]0.673
Ppeak, cmH2O20 [17–24]27 [24–31]< 0.000121 [17–25]29 [22–33]< 0.0001
Pplat, cmH2O17 [15–19]19 [16–18]0.00917 [15–20]19 [15–21]0.227
ΔP, cmH2O9 [8–12]11 [8–13]0.2689 [8–12]9 [7–12]0.741
  1. EFL expiratory flow limitation, Cst,rs static compliance of the respiratory system, Rrs,max total resistance of the respiratory system, Rrs,min flow resistance of the respiratory system, ΔRrs additional resistance of the respiratory system, P/F arterial partial oxygen pressure to fraction of inspired oxygen ratio, PEEPi intrinsic positive end-expiratory pressure, PEEP appl positive end-expiratory pressure applied at the ventilator, RR respiratory rate, VT tidal volume, IBW ideal body weight, Ppeak peak inspiratory pressure, Pplat plateau pressure, ΔP driving pressure