reference values and correlation with body-composition
AIM: To determine the splanchnic blood flow and oxygen uptake in healthy-subjects and patients and to relate the findings to body-composition. METHODS: The total splanchnic blood flow (SBF) and oxygen uptake (SO₂U) were measured in 20 healthy volunteers (10 women) and 29 patients with suspected chronic intestinal ischemia (15 women), age 40-85 years, prior to and after a standard meal. The method is based on the Fick principle using the continuous infusion of an indicator (99mTechnetium-labelled mebrofenin) and catheterization of an artery and the hepatic vein. An angiography of the intestinal arteries was performed during the same investigation. A whole-body dual-energy x-ray absorptiometry scan was performed in healthy volunteers to determine body composition. RESULTS: Angiography revealed no atherosclerotic lesions in the intestinal arteries. The mean baseline SBF was 1087 mL/min (731-1390), and this value increased significantly to 1787 mL/min after the meal in healthy volunteers (P < 0.001). The baseline SBF in patients was 1080 mL/min, which increased to 1718 mL/min postprandially (P < 0.001). The baseline SBF was independent of age, sex, lean body mass and percentage of body fat. The mean meal-induced increase in SBF was equal to 282 mL/min + 5.4 mL/min × bodyweight, (P = 0.025). The SO₂U in healthy volunteers and patients was 50.7 mL/min and 48.0 mL/min, respectively, and these values increased to 77.5 mL/min and 75 mL/min postprandially, respectively. Both baseline and postprandial SO₂U were directly related to lean body mass. Age and sex exerted no impact on SO₂U. CONCLUSION: A direct correlation between body weight and the postprandial increase in SBF was observed. The effect of body weight should be considered in the diagnosis of chronic intestinal ischemia.
World Journal of Gastroenterology, 2013, Vol 19, Issue 6, p. 882-8
Absorptiometry, Photon; Adult; Aged; Aged, 80 and over; Body Composition; Body Weight; Case-Control Studies; Female; Humans; Imino Acids; Ischemia; Linear Models; Male; Mesenteric Arteries; Mesenteric Ischemia; Mesenteric Vascular Occlusion; Middle Aged; Organotechnetium Compounds; Oxygen Consumption; Postprandial Period; Predictive Value of Tests; Radiopharmaceuticals; Reference Values; Regional Blood Flow; Splanchnic Circulation; Vascular Diseases