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Figure 2 | Critical Care

Figure 2

From: Respiratory variation in inferior vena cava diameter: surrogate of central venous pressure or parameter of fluid responsiveness? Let the physiology reply

Figure 2

Relationship between inferior vena cava (IVC) diameter and central venous pressure (CVP), derived from Barbier and colleagues [5]. The pressure/diameter relationship shows an initial steep part where a minimal increase in CVP, in response to increased intrathoracic pressure, is associated with a large increase in IVC diameter and a flat part where the compliance of the IVC decreases, resulting in less IVC dilation and a larger increase in CVP. Dark arrow: effect of increased intrathoracic pressure in a preload-responsive patient. Gray arrow: effect of increased intrathoracic pressure in a preload-unresponsive patient.

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Critical Care

ISSN: 1364-8535