Wireless surveillance for transjugular intrahepatic portosystemic shunts (TIPS): a feasibility study

Area of Science:

• Hepatology
• Biomedical Engineering
• Medical Devices

Background:

• Shunt surveillance is crucial for patients with cirrhosis and transjugular intrahepatic portosystemic shunts (TIPS).
• Current noninvasive methods like Doppler ultrasound have limitations in detecting shunt failure compared to direct pressure measurements.
• A need exists for accurate, noninvasive methods to monitor portosystemic pressure gradients in TIPS patients.

Purpose of the Study:

• To evaluate the accuracy of implanted wireless pressure sensors in measuring the portosystemic pressure gradient across a TIPS.
• To determine if wireless sensor technology can provide a reliable alternative to existing surveillance methods.

Main Methods:

• Two wireless microelectromechanical system (MEMS) pressure sensors were implanted in a swine model to measure the portosystemic pressure gradient across a TIPS.
• Catheter-based pressure transducers were used as the gold standard for concurrent pressure measurements.

Main Results:

• Wireless MEMS pressure sensor measurements demonstrated high accuracy, with portal and systemic pressure readings within +/-2 mm Hg (mean, 0.86 mm Hg) of the gold standard.
• The wireless system successfully transmitted accurate portosystemic pressure gradient data.

Conclusions:

• Implanted wireless pressure sensors show promise for accurate and noninvasive surveillance of shunt function in patients with TIPS.
• This technology may improve the follow-up and management of patients with portal hypertension and TIPS.