What is the purpose of evaluating the inferior vena cava (IVC) in echocardiography?

Evaluating the inferior vena cava (IVC) in echocardiography is crucial for estimating right atrial pressure. The diameter of the IVC and its respiratory variations provide valuable information about the hemodynamic status of the patient. A dilated IVC that does not collapse with inspiration often indicates elevated right atrial pressure, which can occur in conditions such as heart failure or fluid overload.

The assessment of the IVC can thus serve as a non-invasive measure of right atrial pressure, aiding clinicians in understanding a patient's volume status and cardiac function. This evaluation is especially relevant in critically ill patients, where monitoring fluid management and cardiac filling pressures is essential for effective treatment planning.