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Table 2 Respiratory distress assessment over the spontaneous breathing trial (SBT) between patients who succeeded or failed the SBT

From: Respiratory distress observation scales to predict weaning outcome

Variables of respiratory distress assessment

All patients (n = 58)

SBT success (n = 25)

SBT failure (n = 33)

P value

Before SBT (n = 58)

fR/VT, breaths/min/L

47 (34–66)

37 (29–54)

56 (39–73)

0.010

MV-RDOS  ≥ 2.6, n (%)

10 (17)

0 (0)

10 (24)

0.008

MV-RDOS value

2.2 (2.0–2.3)

2.1 (2.0–2.2)

2.3 (2.0–2.6)

0.014

 Heart rate, beats/min

92 (84–100)

91 (84–98)

94 (84–101)

0.410

 Respiratory rate, cycles/min

22 (17–27)

19 (14–23)

22 (18–28)

0.027

 Use of neck muscle during inspiration, n (%)

5 (9)

0 (0)

5 (15)

0.063

 Abdominal paradox during inspiration, n (%)

0 (0)

0 (0)

0 (0)

1.000

 Facial expression of fear, n (%)

3 (5)

0 (0)

3 (9)

0.251

At 2-min SBT (n = 58)

fR/VT, breaths/min/L

64 (49–79)

52 (41–72)

68 (57–88)

0.010

MV-RDOS  ≥ 2.6, n (%)

21 (38)

3 (12)

18 (55)

< 0.001

MV-RDOS value

2.3 (2.2–4.2)

2.2 (2.1–2.4)

2.6 (2.2–4.5)

0.003

 Heart rate, beats/min

96 (88–102)

92 (86–102)

99 (90–104)

0.063

 Respiratory rate, cycles/min

25 (20–30)

23 (20–26)

28 (24–32)

0.005

 Use of neck muscle during inspiration, n (%)

11 (19)

1 (4)

10 (30)

0.016

 Abdominal paradox during inspiration, n (%)

3 (5)

0 (0)

3 (9)

0.251

 Facial expression of fear, n (%)

10 (17)

3 (12)

7 (21)

0.489

At 15-min SBT (n = 40)

  

n = 15

 

fR/VT, breaths/min/L

67 (45–89)

50 (40–72)

93 (60–141)

0.002

MV-RDOS  ≥ 2.6, n (%)

21 (53)

8 (32)

13 (87)

< 0.001

MV-RDOS value

2.7 (2.2–4.3)

2.3 (2.1–4.1)

4.3 (2.8–5.3)

< 0.001

 Heart rate, beats/min

96 (86–102)

92 (82–101)

97 (88–109)

0.492

 Respiratory rate, cycles/min

25 (21–31)

22 (18–26)

31 (27–34)

0.004

 Use of neck muscle during inspiration, n (%)

12 (30)

5 (20)

7 (47)

0.091

 Abdominal paradox during inspiration, n (%)

5 (13)

1 (4)

4 (27)

0.056

 Facial expression of fear, n (%)

5 (13)

2 (8)

3 (20)

0.345

At 30-min SBT (n = 39)

  

n = 14

 

fR/VT, breaths/min/L

72 (49–107)

56 (41–78)

94 (60–141)

0.006

MV-RDOS  ≥ 2.6, n (%)

22 (56)

10 (40)

12 (86)

< 0.001

MV-RDOS value

3.9 (2.2–4.5)

2.4 (2.1–4.2)

4.8 (4.1–6.2)

< 0.001

 Heart rate, beats/min

98 (89–105)

93 (87–103)

101 (98–116)

0.061

 Respiratory rate, cycles/min

27 (22–32)

24 (21–28)

33 (27–38)

0.007

 Use of neck muscle during inspiration, n (%)

13 (33)

6 (24)

7 (50)

0.157

 Abdominal paradox during inspiration, n (%)

6 (15)

1 (4)

5 (36)

0.016

 Facial expression of fear, n (%)

8 (21)

3 (12)

5 (36)

0.108

  1. MV-RDOS, mechanical ventilation—respiratory distress observation scale; fR, respiratory rate; VT, expired tidal volume