[Transcutaneous measurement of the central venous pressure (author's transl)]

The intrathoracic pressure rises when exhaling into a manometer to such an extent that finally the venous flow of blood to the right heart stops. It is supposed that this venous stop flow pressure (VSFP) is equal to the central venous pressure. In a clinical trial by two independent examiners in 97% of the cases a correlation within a range of 5 cm H2O was found (70 measurements). Thus the central venous pressure can be measured noninvasively with an ultrasound device.