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Annals of Intensive Care

Table 2 Arterial blood gases and the rapid shallow breathing index (RR/Vt) in patients with SBT success and failure

From: Electrical impedance tomography during spontaneous breathing trials and after extubation in critically ill patients at high risk for extubation failure: a multicenter observational study

 

SBT success (n = 61)

SBT failure (n = 17)

Baseline

SBT_0

SBT_30

Baseline

SBT_0

SBT_30

SBT success

vs. failure

pH

7.44 [7.40; 7.48]

//

7.43 [7.39; 7.47]

7.46 [7.42; 7.48]

//

7.41 [7.38; 7.48]

p = 0.546 a

p = 0.762 c

PaCO2 (mmHg)

39.3 [36.0; 45.0]

//

40.0 [35.2; 46.0]

39.5 [38.2; 44.4]

//

41.0 [38.3; 53.5]

p = 0.392 a

p = 0.194 c

PaO2/FiO2 (mmHg)

274 [241; 306]

//

253 [221; 291]

248 [205; 324]

//

188 [156; 237]

p = 0.347 a

p = 0.034 c

RR/Vt (breaths/min/L)

35 [25; 57]

57 [38; 84]

60 [33; 92]

46 [26; 64]

102 [70; 135]

103 [75; 127]

p = 0.389 a

p < 0.001 b

p < 0.001 c

  1. SBT, Spontaneous Breathing Trial; SBT_0, first 5 min after the beginning of the SBT; SBT_30, last 5 min of the SBT; PaCO2, arterial partial pressure of carbon dioxide; PaO2/FiO2, arterial partial pressure to inspired fraction of oxygen ratio; RR/Vt, respiratory rate to tidal volume ration
  2. //Data not present
  3. aComparison between groups within baseline
  4. bComparison between groups within SBT_0
  5. cComparison between groups within SBT_30. According to Bonferroni correction, the threshold for statistical significance is p < 0.025 for pH, PaCO2 and PaO2/FiO2, while p < 0.017 for RR/Vt
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