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The correlation of the inferior vena cava (IVC) diameter and the internal jugular vein (IJV) diameter with Central Venous Pressure (CVP) was already tested.  Few reports compared IVC and IJV ultrasound measures in the same population. No data there are on the correlation of the internal jugular vein diameter and CVP in ventilated patients.

intensive care medicine experimental

A cross-sectional study on the comparison of five ultrasound measurements to estimate central venous pressure in spontaneously breathing and ventilated patients