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Postprandial Portal Venous Blood Flow and Portal Plasma Vasoactive Intestinal Peptide in Man

Postprandial portal blood flow (PBF) has previously been studied in animal models, but data thus far accumulated in man are scarce. Experimental data indicate that local intestinal neurogenic mechanisms and specific neurogenic transmitters are involved in the postprandial splanchnic hyperemic response.' Subsequently, much interest has been focused on the role of vasoactive intestinal peptide (VIP) in the regulation of intestinal blood flow. Current reports suggest that VIP is a neurotransmitter in the noncholinergic, nonadrenegic vasodilation in the intestinal mucosa in the cat.' VIP-containing nerve fibers have been demonstrated in the wall of the portal vein in several species and may participate in the regulation of PBF.' The aim of this study was to investigate postprandial PBF and postprandial portal VIP.