Skip to main content

Table 4 Baseline and 24-h respiratory parameters

From: Twenty-four-hour mechanical power variation rate is associated with mortality among critically ill patients with acute respiratory failure: a retrospective cohort study

Variables MP variation rate ≤ 0%
(MP-worsened, n = 173)
MP variation rate > 0%
(MP-improved, n = 429)
p
Baseline tidal volume, mL/kg PBW 6.7 (5.9, 7.4) 7.1 (6.4, 7.9) < 0.001
24-h tidal volume, mL/kg PBW 6.9 (6.2, 7.9)* 6.9 (5.9, 7.8)* 0.208
Baseline minute ventilation, L/min 8.4 (7.6, 9.4) 8.6 (7.7, 9.9) 0.115
24-h minute ventilation, L/min 9.0 (8.1, 10.2)* 7.5 (6.5, 8.5)* < 0.001
Baseline PEEP, cmH2O 8 (6, 9) 7 (6, 8) 0.353
24-h PEEP, cmH2O 8 (7, 10)* 6 (5, 8)* < 0.001
Baseline Cdyn, mL/cmH2O 31.7 (24.7, 37.5) 31.0 (25.3, 39.3) 0.63
24-h Cdyn, mL/cmH2O 30.9 (22.4, 39.3) 35.3 (27.6, 44.9)* < 0.001
Baseline arterial pH 7.36 (7.29, 7.42) 7.39 (7.32, 7.45) 0.004
24-h arterial pH 7.43 (7.38, 7.47)* 7.44 (7.41, 7.48)* 0.024
Baseline PaCO2, mmHg 42.4 (37.6, 51.6) 38.9 (33.4, 44.3) < 0.001
24-h PaCO2, mmHg 41.0 (37.7, 46.2)* 40.7 (37.0, 44.3)* 0.073
Baseline PaO2/FiO2 ratio, mmHg 123.6 (87.9, 167.0) 134.7 (98.0, 193.3) 0.006
24-h PaO2/FiO2 ratio, mmHg 212.8 (159.1, 280)* 245.0 (184.9, 294.3)* 0.003
Baseline FiO2, % 49 (39, 59) 45 (38, 55) 0.022
24-h FiO2, % 42 (36, 52)* 38 (32, 44)* < 0.001
Baseline PaO2, mmHg 60.1 (49.0, 76.6) 64.2 (50.6, 80.0) 0.061
24-h PaO2, mmHg 86.9 (72.7, 104.0)* 86.5 (74.7, 104.1)* 0.811
Baseline ventilatory ratio 1.50 (1.30, 1.78) 1.42 (1.21, 1.68) 0.018
24-h ventilatory ratio 1.51 (1.33, 1.78) 1.25 (1.12, 1.41)* < 0.001
  1. IQR, interquartile range; PBW, predicted body weight; PEEP, positive end-expiratory pressure; Cdyn, dynamic compliance of respiratory system; PaO2, partial pressure of arterial oxygen; FiO2, fraction of inspired oxygen
  2. *p < 0.05 comparing same parameters at baseline and 24-h by Wilcoxon signed-rank test