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Table 6 Correlation between the ultrasonic indicators and lung ventilation function in COPD

From: Two-dimensional shear wave elastography: a new tool for evaluating respiratory muscle stiffness in chronic obstructive pulmonary disease patients

 

FEV1% predicted value

FEV1/FVC

r

P

r

P

Elastic modulus of diaphragm

-0.81

< 0.001

-0.63

< 0.001

Elastic modulus of intercostal muscle

-0.76

< 0.001

-0.57

< 0.001

DE at tidal inspiration

0.55

< 0.001

0.47

< 0.001

DE at maximal deep inspiration

0.10

0.138

0.23

0.001

TF at tidal inspiration

0.56

< 0.001

0.48

< 0.001

TF at maximal deep inspiration

0.58

< 0.001

0.60

< 0.001

  1. COPD chronic obstructive pulmonary disease, FEV1 forced expiratory volume in one second, FVC forced vital capacity, DE diaphragm excursion, TF thickening fraction