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Table 2 Dyspnea, breathing pattern, hemodynamics and blood gas at the initiation and end of the spontaneous breathing trial

From: Dyspnea and the electromyographic activity of inspiratory muscles during weaning from mechanical ventilation

 

Initiation of SBT

End of SBT

All patients n = 31

SBT success n = 17

SBT failure n = 14

p value

All patients n = 31

SBT success n = 17

SBT failure n = 14

p value

Dyspnea-VAS, mm

2 (0–2)

0 (0–2)

2 (2–5)

0.188

4 (0–10)

0 (0–4)

10 (8–10)

0.003

RR, min‒1

23 (20–28)

20 (17–23)

28 (24–31)

0.001

27 (20–35)

22 (16–25)

35 (32–40)

0.001

Vt, ml

380 (328–476)

453 (372–557)

336 (283–388)

0.004

437 (334–551)

450 (370–563)

345 (271–513)

0.109

RR/Vt, min‒1·ml‒1

48 (41–77)

45 (31–63)

77 (50–95)

0.031

54 (39–74)

52 (35–68)

75 (47–113)

0.625

Heart rate, min‒1

93 (83–102)

88 (72–105)

96 (89–102)

0.014

95 (83–110)

87 (76–101)

99 (91–114)

0.001

Systolic blood pressure, mmHg

136 (127–146)

136 (130–151)

132 (123–146)

0.233

143 (135–171)

139 (130–152)

158 (138–200)

0.016

PaO2, mmHg

89 (79–120)

113 (79–130)

86 (73–94)

0.039

64 (59–78)

65 (60–86)

62 (65–75)

0.218

PaCO2, mmHg

37 (32–46)

36 (32–42)

44 (33–52)

0.406

40 (35–45)

37 (34–41)

44 (41–66)

0.106

pH

7.45 (7.39–7.47)

7.43 (7.38–7.48)

7.45 (7.42–7.48)

0.212

7.42 (7.38–7.49)

7.42 (7.41–7.50)

7.39 (7.29–7.45)

0.150

SaO2, %

97 (95–100)

98 (95–100)

97 (94–98)

0.462

93 (92–95)

95 (93–99)

91 (88–93)

0.005

  1. SBT spontaneous breathing trial; Dyspnea-VAS Dyspnea-Visual Analog Scale; RR respiratory rate; Vt tidal volume; IBW ideal body weight; SaO2 arterial saturation of oxygen
  2. Data are provided as median (interquartile range) and number (%)