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Table 3 Correlations between diaphragmatic ultrasound findings with resting dyspnea, exercise tolerance, quality of life and pulmonary function in FILD cases

From: Diaphragmatic ultrasound findings correlate with dyspnea, exercise tolerance, health-related quality of life and lung function in patients with fibrotic interstitial lung disease

Variables

Deep breathing mobility

Deep breathing thickness

Thickening fraction

R

p

R

p

R

p

 

Health-related quality of life -SGRQ

Respiratory symptoms

− 0.40

0.03

− 0.46

0.01

− 0.26

0.16

Activity

−0.45

0.01

−0.50

< 0.01

−0.44

0.01

 

Resting dyspnea

MRC scale

−0.57

< 0.01

− 0.36

0.05

− 0.54

< 0.01

 

Pulmonary function test

FVC (% pred)

0.76

< 0.01

0.70

< 0.01

0.68

< 0.01

DLCO (% pred)

0.59

< 0.01

0.53

0.01

0.45

0.03

 

Exercise tolerance

SpO2 desaturation at end 6MWT

−0.41

0.03

−0.26

0.18

− 0.41

0.03

Borg dyspnea at end 6MWT

−0.41

0.03

−0.37

0.05

−0.50

< 0.01

  1. Desaturation = (initial peripheral arterial oxygen saturation minus final saturation) over peripheral arterial oxygen saturation initial saturation, in percentage
  2. FILD fibrotic interstitial lung disease, MRC Medical Research Council, FVC forced vital capacity, FEV1 forced expiratory volume in 1 s, TLC total lung capacity, DLCO carbon monoxide diffusing capacity, SpO2 peripheral oxygen saturation, 6MWT six-minute walk test