Table 4.

Changes in the electromyographic activity (EMG) of the Alae nasi, the parasternal intercostal muscles and the diaphragm between the initiation and end of spontaneous breathing trial

	Total (n = 31)	Success (n = 17)	Failure (n = 14)	p
Alae nasi
EMGmax	1.02 (0.94–1.25)	0.98 (0.77–1.10)	1.24 (0.94–1.60)	0.010
EMGauc	1.07 (0.66–1.44)	0.93 (0.60–1.11)	1.44 (0.91–2.40)	0.015
Parasternal intercostal muscles
EMGmax	0.99 (0.87–1.01)	1.00 (0.98–1.01)	0.97 (0.83–1.01)	0.426
EMGauc	1.12 (0.90–1.69)	1.12 (1.04–1.25)	1.03 (0.71–1.78)	0.855
Diaphragm
EMGmax	1.24 (0.80–2.06)	0.84 (0.60–1.57)	1.87 (1.19–2.92)	0.008
EMGauc	1.28 (0.98–1.81)	1.12 (0.79–1.70)	1.65 (1.47–2.93)	0.125
Alae nasi/diaphragm ratio
EMGmax	0.79 (0.54–1.22)	0.87 (0.58–1.52)	0.55 (0.45–0.99)	0.039
EMGauc	0.76 (0.49–1.04)	0.72 (0.43–0.93)	0.68 (0.23–0.96)	0.812

The EMG activity is described by peak EMG (EMGmax) and area under the curve (EMGauc). Values are normalized to EMG activity at initiation of the SBT and are expressed as the ratio of the EMG activity and the end of the SBT to the EMG activity at the initiation of the SBT

Data are provided as median (interquartile range)