IVC — collapsibility & RA pressure

Calculates the IVC collapsibility index from maximal and sniff diameters and estimates RA pressure with the ASE/EACVI matrix, using secondary signs to resolve the intermediate pattern. In ventilated patients it calculates the distensibility index for fluid responsiveness instead.

Upload a report, lab sheet or echo picture to fill this calculator automatically.

Breathing

RA pressure estimation from the IVC is validated in spontaneously breathing patients

IVC diameters

Subcostal view, perpendicular to the long axis, 1–2 cm from the RA junction (proximal to the hepatic veins)

IVC maximal diameter

Expiration · dilated > 21IVC minimal diameter

Sniff / inspiration

Secondary signs of raised RA pressure (for the intermediate pattern)

PASP (optional)

Adds the estimated RA pressure to the TR gradient

Peak TR velocity

m/s

Estimated RA pressure

Enter the maximal and minimal IVC diameters.

References

Rudski LG, et al. Guidelines for the echocardiographic assessment of the right heart in adults (ASE/EAE/CSE). J Am Soc Echocardiogr 2010;23:685-713.
Lang RM, et al. Recommendations for cardiac chamber quantification by echocardiography in adults (ASE/EACVI). J Am Soc Echocardiogr 2015;28:1-39.
Barbier C, et al. Respiratory changes in inferior vena cava diameter are helpful in predicting fluid responsiveness in ventilated septic patients. Intensive Care Med 2004;30:1740-1746.