Periinterventional Coagulation Management of Patients Undergoing a TIPS

Transjugular intrahepatic portosystemic shunt (TIPS) is a very effective procedure to treat complications of portal hypertension in liver cirrhosis. TIPS implantation is indicated in cirrhotic patients to treat or prevent portal hypertensive bleeding and to treat refractory ascites.

During this procedure an artificial connection between portal vein and hepatic vein is placed via an image-guided endovascular approach. Although the procedure is very effective and reasonably safe, several complications can occur.

Due to the underlying cirrhosis, morbidity and mortality of TIPS is high, with a 30-day mortality between 7 and 20%. Procedural site complications (transhepatic and transvenous access), bleeding, development of hepatic encephalopathy or other organ complications and stent complications comprise a considerable risk to the patients, however, the improvement of mortality, renal function and liver function outweighs the risks of the procedure. Optimal patient selection and preoperative preparation is crucial to avoid complications of this procedure.

In liver cirrhosis, coagulation disturbances are common. In hepatic insufficiency, a balanced reduction in the levels of most of pro- and anticoagulant proteins produced in the liver does not impair thrombin generation until levels are quite low. However, the ability of the coagulation system to tolerate or recover from an insult is markedly impaired in liver disease. This allows the coagulation system to be more easily tipped into a state favouring either haemorrhage or thrombosis. The American Gastroenterology Association has recently published best practice advices to manage coagulation in cirrhosis. This review concludes that commonly used global coagulation tests are not optimal to assess the risk of bleeding in cirrhosis. A randomized controlled trial showed, that the use of thrombelastography (TEG) to assess coagulation in cirrhosis resulted in a significantly lower usage of blood products with no increase in bleeding rates.

The bleeding risk for TIPS implantation is not well studied, ranging from 0.6-4.3% of fatal bleeding complications in older uncontrolled case series. No evidenced-based recommendations exist for the correction of coagulation abnormalities before TIPS - and the few existing recommendations are not backed with evidence but rather "eminence based". Currently, global tests of coagulation (prothrombin time and platelet count) are used to guide coagulation correction. Mostly, cut-offs without sufficient evidence (PT \>50%/ INR \>1.8 and platelets \>50 G/L) are used for correction of coagulation.

Also, the risk of stent thrombosis needs to be considered, therefore "blind" substitution of clotting factors or platelet transfusions is not advisable. Unfortunately, the study by De Pietri et al. (6) did only include one patient undergoing TIPS (in the standard of care (SOC) arm), therefore it is yet unknown, whether TEG is useful for guiding the correction of coagulation abnormalities in cirrhosis.

The aim of this trial is to assess, whether TEG guided pre-interventional assessment and correction of coagulation in cirrhotic patients is safe and effective

The study will be performed as a single-center, open-label, randomized prospective cohort study

• Bleeding [Time frame: 90 days]
• complications [Time frame: 90 days]
• Mortality [Time frame: 90 days]
• Modified TIPS Score (MOTS) [Time frame: 90 days]
• Factor XIII [Time frame: 2 days]