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Table 1 Clinical characteristics of the patients

From: Influence of lung aeration on diaphragmatic contractility during a spontaneous breathing trial: an ultrasound study

 Overall
(n = 49)
LUS < 14
(n = 16)
LUS ≥ 14
(n = 33)
P value
LUS15 (11 to 21)10 (8 to 11)19 (15 to 22)< 0.001
Age (year)55 (41 to 67)58 (43 to 71)52 (41 to 66)0.179
Sex (male)33 (67%)9 (56%)24 (72%)0.249
APACHE II at admission13 (8 to 16)15 (9 to 18)13 (7 to 15)0.375
SOFA at admission6 (4 to 8)5 (4 to 7)6 (4 to 9)0.390
Cause of admission (n)   0.239
 Medical26 (53%)8 (50%)18 (55%) 
 Surgical15 (31%)7 (44%)8 (24%) 
 Trauma8 (16%)1 (6%)7 (21%) 
ET size (mm)7.5 (7.5 to 7.5)7.5 (7 to 7.5)7.5 (7.5 to 7.5)0.418
Frequency-T-1 (breaths/min)17 (15 to 21)16 (14 to 22)18 (15 to 21)0.571
Pressure support level T-1 (cmH2O)8 (8 to 10)8 (8 to 10)8 (8 to 9)0.834
PEEP T-1 (cmH2O)5 (5 to 6)5 (5 to 6)5 (5 to 6)0.927
VT T-1 (ml)495 (409 to 571)450 (418 to 591)514 (403 to 563)0.981
FiO2 (%) T-140 (35 to 40)40 (35 to 40)40 (34 to 45)0.237
PaO2/FiO2 T-1 (mmHg)244 (213 to 278279 (236 to 339)238 (208 to 205)0.016
Duration of MV before SBT (day)10 (4 to 15)9 (3 to 12)10 (4 to 16)0.412
Total duration of MV (day)10 (5 to 17)9 (4 to 12)10 (6 to 18)0.197
  1. Data are expressed as median and 25–75% IQR
  2. LUS lung ultrasound aeration score, APACHE Acute Physiology and Chronic Health Evaluation, SOFA Sequential Organ Failure Assessment, MV mechanical ventilation, SBT spontaneous breathing trial, ET endotracheal tube, T-1 during mechanical ventilation 1 h before SBT, PEEP positive end-expiratory pressure, VT tidal volume, Frequency respiratory rate