Table 2 Published correlations between ultrasound measurements of maximum IVC and CVP or RAP among spontaneously ventilating patients

Entire respiratory cycle

Taniguchi et al., [19]

90

8.0

0.67

<0.05

Yildirimturk et al., [15]

22

9.7

0.62

<0.005

Patients with normal sinus rhythm only; When all patients (n = 39) included, r = 0.51 (p < 0.005).

Patel et al., [16]

36

11.0

0.56

<0.001

Brennan et al., [18]

91

7.0

0.50

^a

Ommen et al., [30]

71

^a

0.86

<0.001

Moreno et al., [17]

65

^a

0.40

^a

End-expiration

Citilcioglu et al., [25]

34

7.7

^a

0.002

Tsutsui et al., [22]

71

13.0

0.40

<0.0001

Zhang et al., [21]

40

3.0

0.59

<0.01

Prekker et al., [26]

65

7.0

0.76

<0.05

Study reports median CVP/RAP

De Lorenzo et al., [27]

57

10.4

0.47

<0.05

43 % of patient received mechanical ventilation

Nagdev et al., [28]

73

10.5

0.66

<0.05

19 % of patients received mechanical ventilation

Nagueh et al., [31]

23

9.0

0.40

0.05

Kircher et al., [3]

83

^a

0.48

^a

Mintz et al., [20]

50

^a

0.72

<0.001

End-inspiration

Citilcioglu et al., [25]

34

7.7

^a

0.001

Tsutsui et al., [22]

71

13.0

0.49

<0.0001

minimum diameter during sniff

De Lorenzo et al., [27]

29

10.4

0.69

<0.05

extrapolated from data provided

Nagdev et al., [28]

73

10.5

0.78

<0.05

Kircher et al., [3]

83

^a

0.71

^a

Simonson et al., [32]

27

^a

0.56

^a

minimum diameter during inspiration

Simonson et al., [32]

27

^a

0.35

^a