Electrical impedance tomography during spontaneous breathing trials and after extubation in critically ill patients at high risk for extubation failure: a multicenter observational study

Annals of Intensive Care

Table 4 EIT data in patients with extubation success and failure

	Baseline	SBT_0	SBT_30	SB_0	SB_30
∆Vt%
Extubation success (n = 39)	0 [0; 0]	− 12 [− 31; 0]	− 9 [− 29; 7]	− 3 [− 16; 18]	− 12 [− 34; 19]
Extubation failure (n = 22)	0 [0; 0]	− 25 [− 42; − 10]	− 29 [− 45; − 11]	− 21 [− 39; 1]	− 22 [− 46; − 11]
Extubation success vs. failure	p > 0.999	p = 0.117	p = 0.024	p = 0.014	p = 0.061
∆EELI (ml)
Extubation success (n = 39)	0 [0; 0]	− 125 [− 237; 23]	− 78 [− 250; 115]	− 187 [− 488; 82]	− 60 [− 371; 256]
Extubation failure (n = 22)	0 [0; 0]	− 112 [− 316; 17]	− 194 [− 335; − 59]	− 236 [− 438; 139]	− 290 [− 537; 152]
Extubation success vs. failure	p > 0.999	p = 0.671	p = 0.253	p > 0.999	p = 0.132
Inhomogeneity index
Extubation success (n = 39)	46 [42; 63]	53 [44; 68]	56 [44; 70]	52 [45; 66]	53 [45; 69]
Extubation failure (n = 22)	53 [48; 60]	65 [55; 80]	62 [54; 71]	64 [50; 79]	66 [55; 74]
Extubation success vs. failure	p = 0.166	p = 0.025	p = 0.132	p = 0.049	p = 0.029

SBT: Spontaneous Breathing Trial; SBT_0: first 5 min after the beginning of the SBT; SBT_30: last 5 min of the SBT; SB_0: first 5 min of the spontaneous breathing; SB_30: last 5 min of the spontaneous breathing; ∆Vt%: change from baseline of the tidal volume in percentage; ∆EELI: change from baseline of the end-expiratory lung impedance
According to Bonferroni correction, the threshold for statistical significance is p < 0.017