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

From: The efficacy of sonographic measurement of inferior vena cava diameter as an estimate of central venous pressure

Measurement time-point Study N Mean CVP or RAP Correlation coefficient p-value Comments
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  
  1. adata not available