Improvement of the splanchnic blood flow and hepatic vein oxygenation following revascularization in patients with chronic mesenteric ischaemia

Abstract

Objectives: Chronic mesenteric ischaemia (CMI) is an underdiagnosed but severe condition. Access to functional testing is often limited and the diagnosis is usually based primarily on symptoms and imaging. One of the functional tests available is measurement of the splanchnic blood flow (SBF). The purpose of the present investigation was to evaluate if changes in the splanchnic perfusion after revascularization can be detected by measuring the SBF and hepatic vein oxygenation.

Materials and methods: The SBF was measured in 10 patients before and after revascularization of the mesenteric arteries by either percutaneous transluminal angioplasty (n = 9) or open revascularization (n = 1). The SBF was measured indirectly using Fick's principle and using the tracer Tc-99m Mebrofenin along with assessment of hepatic blood oxygenation, before and after a standard meal, following catheterization of a hepatic vein and the femoral artery.

Results: Nine of 10 patients (90%) achieved a profound increase in SBF after revascularization (mean increase in postprandial response to meal stimulation from 71 ± 95 to 531 ± 295 ml/min, p = 0.001), and an increase in postprandial hepatic vein oxygen saturation (from 52 ± 14% to 59 ± 13%, p = 0.006). The symptoms of the patients diminished accordingly. One patient had no symptom relief, and no increase in postprandial SBF, but an angiographic result with no significant stenosis postrevascularization.

Conclusions: Revascularization increased the SBF and hepatic vein oxygen saturation significantly concurrent with symptom relief and according with the angiographic successful result in the vast majority of patients. A satisfying angiographic result post vascular intervention does not rule out CMI.

Keywords: angiography; atherosclerosis; chronic mesenteric ischaemia; clinical laboratory techniques, percutaneous transluminal angioplasty, splanchnic blood flow.

Figure 1

Total splanchnic blood flow (SBF) before and after revascularization with 95% confidence intervals. *p < 0.05.

Figure 2

Change in hepatic vein oxygen saturation compared to mean fasting values with 95% confidence intervals (n = 10). *p < 0.05.

Figure 3

Changes in fasting SBF (a), postprandial increase in SBF (b) and lowest hepatic vein saturation (c) pre and postrevascularization on a patient basis (n = 10). The patient with no symptom relief is indicated with a full dot. SBF, splanchnic blood flow.