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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.