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Table 3 Cardiorespiratory parameters of patients during 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) PA NPPV (n = 28) IMV (n = 37) PB
  First minute   Final  
Respiratory rate (f), ipma 27.7 ± 5.7 30.05 ± 8.6 0.23 39.0 ± 2.8b 38.0 ± 3.1b 0.19
Tidal volume (VT), mL 389 ± 0.25 399 ± 0.28 0.51 278 ± 0.24b 268 ± 0.27b 0.46
f/VT 82.6 ± 45 87.6 ± 54.4 0.50 149.0 ± 67.9b 151.3 ± 58.4b 0.23
Heart rate, bpma 95.7 ± 13.6 101.4 ± 20.3 0.57 108.4 ± 12.6b 116.1 ± 14.4b 0.77
SpO2a 95.1 ± 1.92 96.6 ± 1.97 0.15 88.2 ± 2.4 87.3 ± 2.6 0.09
  1. Values are mean ± standard deviation. aValues at moment of failure or at 30 minutes; bP <0.05 (comparison between groups in the first and last minutes). bpm, beats per minute; ipm, incursions per minute; IMV, invasive mechanical ventilation; NPPV, noninvasive mechanical ventilation; PA, comparison between groups in the first minute (t test); PB, comparison between groups in the 30th minute (t test); SpO2, peripheral oxygen saturation.