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Table 2 Respiratory characteristics of patients before spontaneous breathing trial

From: Noninvasive mechanical ventilation may be useful in treating patients who fail weaning from invasive mechanical ventilation: a randomized clinical trial

  NPPV (n = 28) IMV (n = 37) P value
Respiratory rate, rpm 22.3 ± 4.2 21.2 ± 4.9 0.35
Tidal volume, mL 594 ± 0.21 629 ± 0.27 0.58
Peak inspiratory pressure, cm H2O 19.3 ± 4.9 18.6 ± 2.9 0.44
Maximal inspiratory pressure, cm H2O 36.0 ± 11.5 37.0 ± 16.1 0.64
Arterial pH 7.41 ± 0.07 7.41 ± 0.06 0.96
PaCO2, mm Hg 45.1 ± 11.5 40.1 ± 11.1 0.08
PaO2, mm Hg 88.7 ± 23.2 99.7 ± 29.5 0.11
SaO2, percentage 95.8 ± 3.1 96.6 ± 2.5 0.26
  1. Values are mean ± standard deviation. P value indicates comparison between groups using t test. IMV, invasive mechanical ventilation; NPPV, noninvasive mechanical ventilation; PaCO2, arterial partial pressure of carbon dioxide; PaO2, arterial partial pressure of oxygen; rpm, respirations per minute; SaO2, arterial saturation of oxygen.