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Table 2 Evolution of EIT-related parameters at different flow rates

From: Effect of postextubation high-flow nasal cannula therapy on lung recruitment and overdistension in high-risk patient

Variables

Baseline

20 L/min

40 L/min

60 L/min

Trend—p

Mauchly‘s test of sphericity p value

ΔEELIgl (%)

Baseline

7.19 (− 5.12,18.66)

10.61 (− 3.42,41.99)a,b

26.32 (10.68,60.75)a,b,c

< 0.0001*

0.046

ΔEELI ROI1 (%)

Baseline

0.32 (− 0.07,2.74)

0.18 (0.00,3.05)

1.61 (0.00,4.60)

0.131

0.000

ΔEELI ROI2 (%)

Baseline

2.12 (− 3.21,7.35)

8.6 (− 1.42,18.19)a,b

16.15 (4.00,27.90)a,b

0.001*

0.000

ΔEELI ROI3 (%)

Baseline

2.52 (− 3.77,6.23)

3.94 (− 3.04,14.48)

14.29 (4.01, 32.26)a,b,c

< 0.0001*

0.462

ΔEELI ROI4 (%)

Baseline

0.21 (0.00,0.40)

0.00 (0.00,1.77)

0.33 (0.00,2.43)

0.345

0.000

ΔVTgl (%)

Baseline

6.40 (− 12.27,22.74)

5.66 (− 8.60,19.78)

3.71 (− 3.29,15.29)

0.095

0.066

ΔVT ROI1 (%)

Baseline

0.41 (− 1.13,1.72)

0.43 (− 0.27,2.10)

0.72 (0.00,2.53)

0.069

0.000

ΔVT ROI2 (%)

Baseline

1.66 (− 5.01,13.19)

4.43 (− 2.17,12.41)

1.93 (− 2.50,13.52)

0.077

0.003

ΔVT ROI3 (%)

Baseline

2.97 (− 4.07,8.10)

0.53 (− 4.20,8.00)

0.12 (− 9.02,10.20)

0.446

0.004

ΔVT ROI4 (%)

Baseline

0.00 (− 1.19,0.64)

0.00 (− 0.80,1.23)

0.00 (− 0.54,1.24)

0.354

0.000

GI index (%)

0.47 ± 0.22

0.47 ± 0.21

0.47 ± 0.23

0.46 ± 0.20

0.693

0.000

RVD index (%)

4.34 (3.39,9.65)

5.66 (3.74,11.82)

5.52 (3.51,9.59)

5.89 (3.82,8.34)

0.191

0.000

Recruited pixels

Baseline

5 (5,17)a,b

9 (1,27)a,b

11 (1,22)a,b

0.0001*

0.000

Overdistended pixels

14 (8,30)

13 (5,28)

13 (3,31)

15 (6,32)

0.101

0.000

Tidal recruitment/derecruitment pixels

12 (7,41)

9 (1,16)

16 (8,33)

11 (4,16)

0.124

0.031

  1. p value by one-way analysis of variance (ANOVA) for repeated measures
  2. ΔEELI change of end-expiratory lung impedance, ΔVT change of tidal variation, gl global, ROI region of interest, GI global inhomogeneity, RVD regional ventilation delay
  3. avs. baseline, p < 0.05
  4. bvs. 20 L/min, p < 0.05
  5. cvs. 40 L/min, p < 0.05
  6. *p < 0.05