Table 5 Summary of abnormalities in PFT (all ages) in 35 children by type of ARDS

Hyperinflation and/or obstructive pattern

12/35

9

3

 Hyperinflation [functional residual capacity (FRC), total lung capacity (TLC)]

7/30

4

3

 Obstruction [resistance by interruption technique (R_int), total lung resistance by oesophageal-balloon technique (R_L)]

11/19

9

2

 Associated to a decrease in lung dynamic compliance (C_Ldyn /FRC)

7/9

7

0

Restrictive abnormalities

6/12

4

2

 True restrictive ventilatory defect (TLC) in 4/11 children

3

1

 and/or decrease in FVC and FEV₁ together with a FEV₁/FVC ratio ≥ LLN suggestive of a restrictive ventilatory defect in 4/12 children

2

2

Decrease in carbon monoxide transfer factor (T_LCO)

3/8

2

1

Hypoxemia

2/14

1

1

Decrease in inspiratory muscle strength (SNIP)

2/13

2

0

Decrease in 6-min-walking distance

11/15

9

2

Desaturation at the end of a 6-min-walk test

1/16

1

0