[Effect of transjugular portosystemic shunt on insulin resistance]

Patients with cirrhosis of the liver suffer from hyperinsulinaemia and a certain degree of insulin resistance. More frequently than in the rest of the population they have diabetes. Transjugular intrahepatic portosystemic shunts (TIPS) as a therapeutic method in complications of portal hypertension lead to rapid haemodynamic changes in the liver. The objective of the submitted work was to assess whether TIPS has an impact on insulinaemia and whether it influences insulin resistance in patients with cirrhosis of the liver.

The authors evaluated a group of 22 patients with cirrhosis of the liver (10 diabetics and 12 subjects without diabetes) indicated for TIPS. They investigated the insulin and C-peptide concentration in blood obtained by catheterization from the hepatic and portal vein before and after TIPS and in the peripheral blood before TIPS, 1 hour, 1 day, 1 week and 1 month after TIPS. The insulin resistance was examined by the method of the hyperinsulin euglycaemic clamp (HEC) before TIPS, 1 day, 1 week, and 1 month after TIPS. The levels of C-peptide and insulin were assessed by the IRMA method. The blood sugar level in HEC was measured by means of a Hemocue apparatus. The results were evaluated by the non-parametric Wilcoxon test for two dependent samples.

Both groups (diabetics and non-diabetics) were comparable as to age, sex, etiology of liver cirrhosis and indication for TIPS. After introduction of TIPS a change of insulin clearance occurred (p = 0.01) and a change of the insulin level in the hepatic vein immediately after TIPS (p = 0.02). Insulin clearance before TIPS was 37-90% (median 54%) and after TIPS it declined to 0-79% (median 38%) (p = 0.01). Already 1 hour after the operation the authors observed a rise of the insulin level in peripheral blood as compared with baseline values (p = 0.002). Statistically significant hyperinsulinaemia persisted one month after TIPS (p = 0.005). Values of C-peptide did not change significantly in time, neither in the hepatic vein nor in the peripheral blood. On examination of IR no statistically significant changes occurred after TIPS. On evaluation of different groups of diabetics and non-diabetics the IR was more marked in patients with DM (mean M = 1.7 mg/kg/min.) than in patients without DM (3.7 mg/kg/min.) (p = 0.03). The authors did not record significant changes of IR in time in different groups. Compensation of DM was not influenced by TIPS. The fasting blood sugar levels before TIPS and 1 month after TIPS were comparable.

After TIPS a rise of the insulin level in peripheral blood occurred due to the reduced insulin clearance in the liver. Despite hyperinsulinaemia which persisted for one month after the operation, the insulin resistance did not deteriorate. Compensation of diabetes was not affected by TIPS.