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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