Utility of color Doppler ultrasonography predicting tips dysfunction.

Area of Science:

• Medical Imaging
• Interventional Radiology
• Hepatology

Background:

• Transjugular intrahepatic portosystemic shunt (TIPS) dysfunction diagnosis traditionally relies on portal pressure gradient (PPG) measurement.
• Color Doppler ultrasonography (CDUS) has shown potential as a non-invasive alternative for assessing TIPS dysfunction, but results have been inconsistent.

Purpose of the Study:

• To develop and validate CDUS criteria for accurately assessing TIPS dysfunction.
• To establish a predictive rule using CDUS parameters to guide clinical decisions regarding TIPS monitoring.

Main Methods:

• A retrospective analysis of 117 simultaneous CDUS and hemodynamic evaluations in 34 patients with TIPS.
• Development of a predictive model using logistic regression based on CDUS parameters (mean maximum flow velocity at the portal vein - mVPmax, and direction of flow in intrahepatic portal vein branches - FD).
• Validation of the predictive model in an independent prospective cohort of 119 paired evaluations in 55 patients.

Main Results:

• TIPS dysfunction was identified in 57 of 117 retrospective studies.
• Multivariate analysis identified mVPmax and FD as independent predictors of TIPS dysfunction.
• The derived prediction rule demonstrated high sensitivity (90% retrospective, 87% prospective) and a low negative likelihood ratio (0.23), indicating its utility in ruling out dysfunction.

Conclusions:

• The combination of mVPmax and FD via CDUS effectively correlates with TIPS dysfunction.
• This CDUS-based predictive rule exhibits high sensitivity and a good negative likelihood ratio, allowing for the safe avoidance of invasive TIPS catheterization in approximately half of the patients.
• The validated criteria are applicable to both bare and polytetrafluoroethylene (PTFE)-covered stents.