Abstract
Sonographic measurement of respiratory variation of inferior vena cava (IVC) diameter has been used as a non-invasive measure of volume status. The diameter, shape and location of the IVC changes as it courses inferiorly. Unintended movement of the probe relative to the IVC during the respiratory cycle or anatomical movement of the IVC during contraction of the diaphragm has potential to introduce error into IVC measurements by changing the sampling location of the IVC. To quantify these changes, we performed serial measurements of the IVC imaged on abdominal CT in multiple planes and locations.
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