Correlation between echocardiographic estimation of right atrial pressure and invasive measurement of central venous pressure in postoperative pediatric patients with congenital heart disease: a prospective observational study

The Egyptian Heart Journal

Table 5 Results of the linear regression between parameters of superior vena cava and invasively measured central venous pressure

Variable	R (Pearson correlation coefficient)	R square	P value
Superior vena cava systolic velocity	0.299	0.089	0.081
Superior vena cava systolic velocity time integral	− 0.207	0.043	0.232
Superior vena cava diastolic velocity	− 0.219	0.048	0.213
Superior vena cava diastolic velocity time integral	− 0.158	0.025	0.371
Superior vena cava reversal velocity	0.104	0.011	0.572
Superior vena cava reversal velocity time integral	0.044	0.002	0.810
Superior vena cava S velocity/D velocity ratio (SVC_S/D)	0.462	0.214	0.006
Superior vena cava S velocity/D velocity ratio (SVC_S/D)	0.462	0.214	Estimated central venous pressure = 7.46 + 2.08 × SVC_S/D

Pearson Chi-square or Fisher’s exact test
Categorical variable	P value
SVC S/D < 1.9	0.394