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Table 3 Comparison of diaphragm function parameters between COPD subgroup at the end of maximal breathing

From: MRI-assessed diaphragmatic function can predict frequent acute exacerbation of COPD: a prospective observational study based on telehealth-based monitoring system

Variables

Mild group

(N = 9)

Middle group

(N = 19)

Severe group

(N = 18)

Very severe group

(N = 13)

F

P

Diaphragmatic dome factor

      

Insp

1.20 ± 0.07✭

1.16 ± 0.11

1.15 ± 0.09

1.10 ± 0.04

2.39

0.079

Exp

1.28 ± 0.09✭

1.24 ± 0.04

1.28 ± 0.19◇

1.16 ± 0.11

2.77

0.050

Anterior–posterior diameter of chest (cm)

      

Anterior–posterior diameter Insp (cm)

19.52 ± 1.86

18.83 ± 1.33

18.33 ± 1.78

18.82 ± 1.51

1.11

0.353

Anterior–posterior diameter Exp (cm)

16.34 ± 1.83✭

16.99 ± 1.37

16.36 ± 1.86◇

17.79 ± 1.21

2.50

0.069

Chest wall motion (cm)

3.18 ± 1.31✭✭✭

1.84 ± 0.90***

1.97 ± 0.69##◇◇

1.02 ± 0.64△

11.04

P < 0.001

Lung area (cm2)

      

Lung area Insp (cm2)

355.01 ± 21.52

346.53 ± 44.02◇◇

342.58 ± 40.29

385.72 ± 48.13△

3.20

0.030

Lung area Exp (cm2)

190.53 ± 32.04✭✭✭

226.01 ± 36.03*

245.53 ± 37.70##◇◇◇

306.45 ± 44.88△△△

18.96

P < 0.001

Change of lung area (cm2)

164.48 ± 23.24✭✭✭

120.52 ± 28.33**

97.06 ± 29.04###□

79.27 ± 37.72△△△

16.10

P < 0.001

Upper-lower diameter of the lung (cm)

      

Upper-lower diameter Insp (cm)

21.89 ± 1.42✭✭✭

22.16 ± 2.46

22.73 ± 1.76◇◇◇

26.07 ± 1.64△△△

12.81

P < 0.001

Upper-lower diameter Exp (cm)

14.55 ± 1.78✭✭✭

16.57 ± 2.22**□□

18.80 ± 1.99###◇◇◇

22.81 ± 1.49△△△

27.39

P < 0.001

Diaphragmatic displacement (cm)

7.34 ± 1.74✭✭✭

5.58 ± 1.74*

3.94 ± 1.28###□□

3.26 ± 1.05△△△

13.32

P < 0.001

Diaphragm thickness (mm)

      

Thickness Insp (mm)

6.44 ± 1.00✭

6.47 ± 1.35

5.83 ± 0.74

5.42 ± 0.71

3.51

0.021

Thickness Exp (mm)

4.61 ± 0.71

4.64 ± 0.59

4.79 ± 0.61

4.66 ± 0.62

0.26

0.852

Diaphragm thickening fraction

40.51 ± 15.82✭✭✭

38.50 ± 15.68

22.54 ± 14.31##□□

16.45 ± 5.18△△△

10.22

P < 0.001

  1. Data are presented as mean ± SD unless otherwise stated
  2. Mild group: FEV1 ≥ 80% predicted; moderate group: 50% ≤ FEV1 < 80% predicted; severe group: 30% ≤ FEV1 < 50% predicted; very severe group: FEV1 < 30% predicted. P values derived from ANOVA testing. *, **, *** comparison between mild and moderate (P˂0.05, P˂0.01, P˂0.001); #, ##, ### comparison between mild and severe (P˂0.05, P˂0.01, P˂0.001); ✭, ✭✭✭ comparison between mild and very severe (P˂0.05, P˂0.001), □ comparison between moderate and severe (P˂0.05); △, △△, △△△comparison between moderate and very severe (P˂0.05, P˂0.01, P˂0.001); ◇, ◇◇, ◇◇◇comparison between severe and very severe (P˂0.05, P˂0.01, P˂0.001)
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BMC Pulmonary Medicine

ISSN: 1471-2466

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