Which abnormal Doppler finding is associated with a transjugular intrahepatic portosystemic shunt (TIPS)?

The correct answer highlights a significant aspect of evaluating a transjugular intrahepatic portosystemic shunt (TIPS) via Doppler ultrasound. When assessing a TIPS, a stent velocity below 60 cm/sec is considered abnormal as it may indicate inadequate blood flow through the shunt. In the context of TIPS, adequate flow is crucial to ensure that the shunt is functioning properly, and velocities that fall below this threshold can be indicative of problems such as stent occlusion or malposition.

In addition, stent velocities of 200 cm/sec would typically be higher than the expected range; while this may indicate patent flow, it does not directly correlate to a complication. The presence of hepatopetal flow within the stent is also a sign of proper TIPS function, as it suggests that blood is flowing towards the liver, which is desirable. Lastly, hepatofugal flow is typically associated with portal hypertension, but in the context of the left portal vein, it does not specifically relate to TIPS function assessment.

By understanding that velocities below the defined threshold suggest compromised shunt function, it becomes clearer why this finding is critical in monitoring patients with TIPS. Proper Doppler assessment is essential for managing potential complications in