TIPS evaluation
Updates to Article Attributes
TIPS evaluation is useful to ensure that the shunt is working properly and that no stenosis has occurred within the stent. Ultrasound is often used as a first line-line modality.
Radiographic features
Ultrasound
The normal TIPS should show colour Doppler flow throughout its length. The in-stent velocities are typically higher than in a native portal vein 1.
Trending stent velocities over multiple exams adds specificity to a single evaluation. If there is a concern for a stenosis based on a combination of abnormal findings, venography can be pursued.
Normal
- normal TIPS velocity: 90-190 cm/sec
- normal portal vein velocity before entering the TIPS: ~30 cm/sec
- phasic waveform
- the portal vein branches normally reverse their flow into the shunt
Stenosis
- colour Doppler aliasing at the site of the stenosis
- velocity of >190 cm/sec at a stenotic segment
- velocity of <90 cm/sec in nonstenotic segments
- velocity <30 cm/sec in the pre-stent portal vein (accessory sign)
- complete occlusion: lack of colour Doppler flow
Always be sure to thoroughly evaluate the hepatic vein distal to the stent as well.
3D and 4D ultrasound techniques to evaluate TIPS flow volumes are being developed as a possible improvement over using velocities 3.
Venography
To be added. If you have some interventional radiology experience and would like to add to this article, click "Edit Article" above.
-<p><strong>TIPS evaluation</strong> is useful to ensure that the shunt is working properly and that no stenosis has occurred within the stent. Ultrasound is often used as a first line modality.</p><h4>Radiographic features</h4><h5>Ultrasound</h5><p>The normal TIPS should show colour Doppler flow throughout its length. The in-stent velocities are typically higher than in a native portal vein <sup>1</sup>.</p><p>Trending stent velocities over multiple exams adds specificity to a single evaluation. If there is concern for a stenosis based on a combination of abnormal findings, venography can be pursued.</p><h6>Normal</h6><ul>- +<p><strong>TIPS evaluation</strong> is useful to ensure that the shunt is working properly and that no stenosis has occurred within the stent. Ultrasound is often used as a first-line modality.</p><h4>Radiographic features</h4><h5>Ultrasound</h5><p>The normal <a title="Transjugular intrahepatic portosystemic shunt (TIPS)" href="/articles/transjugular-intrahepatic-portosystemic-shunt-tips-4">TIPS</a> should show colour Doppler flow throughout its length. The in-stent velocities are typically higher than in a native <a title="Portal vein (PV)" href="/articles/portal-vein">portal vein</a> <sup>1</sup>.</p><p>Trending stent velocities over multiple exams adds specificity to a single evaluation. If there is a concern for a stenosis based on a combination of abnormal findings, venography can be pursued.</p><h6>Normal</h6><ul>