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Ultrasound Imaging and Central Venous Pressure in Spontaneously Breathing Patients: a Comparison of Ultrasound-based Measures of Internal Jugular Vein and Inferior Vena Cava

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Abstract

Background: Ultrasound evaluation of inferior vena cava and internal jugular vein dia-meters predicts the intravascular volume status in critical patients. The aim of the present study was to determine which ultrasound-derived index is most strongly associated with central venous pressure (CVP). Furthermore, we determined the utility of selected variables in predicting low volume status (CVP < 8 mmHg).

Methods: All patients underwent a transthoracic echocardiogram, vascular ultrasound examination, invasive central venous pressure, and intra-abdominal pressure determination. The following indexes were calculated: inferior vena cava diameter, internal jugular vein maximum diameter, collapsibility index, and internal jugular vein ratio.

Results: 41 spontaneously breathing patients were recruited. Central venous pressure significantly correlated with inferior vena cava diameter ( r = 0.35, P = 0.02), internal jugular vein ratio ( r = 0.35, P = 0.03), and internal jugular vein maximum diameter ( r = 0.58, P < 0.001). The inferior vena cava collapsibility index did not show any association. The areas under the receiver operating characteristic curves to discriminate a low central venous pressure (< 8 mmHg) were the following: internal jugular vein diameter 0.80 (95% CI: 0.63-0.90); inferior vena cava diameter 0.66 (95% CI: 0.49-0.80); and internal jugular vein ratio 0.68 (95% CI: 0.51-0.82).

Conclusions: The internal jugular vein diameter, the internal jugular vein ratio, and the inferior vena cava diameter showed a significant correlation with central venous pressure. In particular, the internal jugular vein diameter showed good accuracy in predicting a low central venous pressure.

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