Table 2 Summary of comparisons between measurement of the inferior vena cava (IVC) in adult patients mechanically ventilated in pressure control mode

M-SC

AI-SC

IVC Min (mm)

0.79;

− 0.01 to 0.93

3.0;

2.0 to 4.0

− 2.1;

− 3.8 to − 0.3

8.1;

6.3 to 9.8

IVC Max (mm)

0.78;

0.02 to 0.93

2.9;

1.9 to 3.9

− 2.3;

− 4.1 to − 0.5

8.1;

6.4 to 9.9

IVC-DI (%)

0.65;

0.27 to 0.83

− 3.1;

− 6.4 to 0.3

− 20.1;

− 25.9 to − 14.3

13.9;

8.1 to 19.7

M-TH

AI-TH

IVC Min (mm)

0.88;

− 0.06 to 0.96

2.4;

1.8 to 3.1

− 0.7;

− 1.8 to 0.4

5.6;

4.5 to 6.7

IVC Max (mm)

0.85;

− 0.08 to 0.96

2.5;

1.9 to 3.2

− 0.8;

− 2.0 to 0.3

5.9;

4.7 to 7.1

IVC-DI (%)

0.65;

0.25 to 0.84

− 2.0;

− 5.5 to 1.5

− 19.3;

− 25.4 to 13.3

15.4;

9.3 to 21.5

M-SC

M-TH

IVC Min (mm)

0.74;

0.41 to 0.88

1.1;

− 0.7 to 2.8

− 6.9;

− 9.9 to − 4.0

9.1;

6.1 to 12.0

IVC Max (mm)

0.69;

0.30 to 0.86

1.2;

− 0.5 to 3.0

− 7.0;

− 10.0 to -3.9

9.5;

6.4 to 12.5

IVC-DI (%)

0.54;

− 0.09 to 0.80

0.1;

− 4.0 to 4.2

− 19.0;

− 26.2 to − 11.9

19.3;

12.1 to 26.4

AI-SC

AI-TH

IVC Min (mm)

0.77;

0.46 to 0.90

0.4

− 6.9;

− 9.9 to − 4.9

7.8;

5.75 to 10.82

IVC Max (mm)

0.76;

0.45 to 0.90

0.9

− 6.0;

− 8.9 to − 4.1

7.8;

5.9 to 10.7

IVC-DI (%)

0.32;

− 0.63 to 0.72

2.0

− 25.7;

− 35.4 to − 19.3

29.7;

23.3 to 39.4