December 9, 2009Academic Emergency Medicine174 citations

Inferior Vena Cava Percentage Collapse During Respiration Is Affected by the Sampling Location: An Ultrasound Study in Healthy Volunteers

DWDavid J. WallaceUniversity of Pittsburgh MAMichael AllisonBaylor College of Medicine MSMichael B. StoneRutgers, The State University of New Jersey

Structured PICO

Does the sampling location affect the measurement of respiratory variation in IVC collapse in healthy volunteers?

Population

Healthy volunteers

Intervention

Ultrasound measurement of inferior vena cava (IVC) percentage collapse during respiration at different sampling locations (left renal vein, 2 cm caudal to hepatic vein inlet, and junction of right atrium and IVC)

Outcome

Equivalence of respiratory variation in IVC collapse measurements across different sampling locationssurrogate

Clinicians should avoid measuring percentage collapse of the IVC at the junction of the right atrium and IVC, as it yields results that are not equivalent to other standard measurement sites.

Abstract

Measurements of respiratory variation in IVC collapse in healthy volunteers are equivalent at the level of the left renal vein and at 2 cm caudal to the hepatic vein inlet. Measurements taken at the junction of the right atrium and IVC are not equivalent to the other sites; clinicians should avoid measuring percentage collapse of the IVC at this location.

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