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Table 1 Characteristics of the patients

From: Respiratory distress observation scales to predict weaning outcome

Variables

All patients (n = 58)

SBT success (n = 25)

SBT failure (n = 33)

P value

Age, years

63 (51–68)

62 (50–73)

63 (52–68)

0.922

Gender (male), n (%)

31 (53)

15 (60)

16 (48)

0.384

Body mass index, kg/m2

25 (21–29)

25 (20–31)

24 (21–29)

0.782

Comorbidities

    

 Arterial hypertension, n (%)

21 (36)

9 (36)

12 (36)

1.000

 COPD, n (%)

11 (19)

5 (20)

6 (18)

1.000

 Diabetes, n (%)

11 (19)

4 (16)

7 (21)

0.742

 Chronic kidney failure

9 (16)

5 (20)

4 (12)

0.479

Reasons for ICU admission

    

 Acute respiratory failure, n (%)

33 (57)

15 (60)

18 (54)

0.678

 Coma, n (%)

13 (22)

6 (24)

7 (21)

1.000

 Cardiac arrest, n (%)

8 (14)

2 (8)

6 (18)

0.001

 Other, n (%)

4 (7)

2 (8)

2 (6)

1.000

Clinical variables

    

 Length of MV, days (at inclusion)

5 (2–7)

3 (2–6)

5 (2–11)

0.315

 Number of previous SBT (at inclusion)

1 (1–1)

1 (1–1)

1 (1–1)

0.731

 SAPS II (at admission)

63 (49–76)

57 (46–75)

66 (50–76)

0.388

 SOFA (at admission)

10 (7–12)

10 (7–11)

10 (7–12)

0.591

Readiness to wean assessment at inclusion

    

 Heart rate, beats/min

93 (84–100)

92 (79–101)

93 (84–99)

0.735

 Systolic arterial blood pressure, mmHg

132 (116–145)

125 (111–141)

140 (117–152)

0.094

 Bicarbonate, mmol/L

27 (23–31)

25 (19–29)

28 (24–32)

0.105

 PaO2/FiO2

248 (178–329)

315 (211–355)

230 (157–285)

0.014

 Positive end-expiratory pressure, cmH2O

5 (5–6)

5 (5–6)

6 (5–6)

0.092

 Respiratory rate, breaths/min

22 (17–27)

19 (16–25)

22 (17–29)

0.189

 Expired tidal volume, ml/IBW

6.9 (6.2–8.4)

7.0 (6.6–9.2)

6.8 (5.8–8.2)

0.167

  1. COPD, chronic obstructive pulmonary disease; fR, respiratory rate; VT, expired tidal volume; SBT, spontaneous breathing trial; SAPS II, Simplified Acute Physiology Score (SAPS) II; SOFA, Sequential Organ Failure Assessment