Sympathetic discharge to mesenteric organs and the liver

Evidence for substantial mesenteric organ norepinephrine spillover

Anders Åneman, Graeme Eisenhofer, Lars Olbe, Jan Dalenbäck, Peter Nitescu, Lars Fändriks, Peter Friberg

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64 Citations (Scopus)

Abstract

This study used sampling of blood from the portal vein, in addition to arterial and hepatic sites, to estimate separately spillovers of norepinephrine from mesenteric organs and the liver in seven patients undergoing upper abdominal surgery. Conventional measurements in arterial and hepatic venous plasma provided a measure of net hepatomesenteric NE spillover (403 pmol/ml) that indicated a 13% contribution of these organs to total body spillover of NE into systemic plasma (3,071±518 pmol/min). The net hepatomesenteric spillover of NE into systemic plasma was much lower than the spillover of NE from mesenteric organs into portal venous plasma (1,684±418 pmol/min). This and the hepatic spillover of NE into systemic plasma (212±72 pmol/min) indicated a considerable combined spillover of NE from hepatomesenteric organs (1,896±455 pmol/min). The sum of the latter estimate with the difference between total body and net hepatomesenteric NE spillovers provided an adjusted total body spillover of NE into both systemic and portal venous plasma (4,564±902 pmol/min). Mesenteric organs made a 37% contribution, and the liver made a 5% contribution to the adjusted total body spillover of NE. Thus, a substantial proportion of total body sympathetic outflow is directed towards mesenteric organs; this is obscured by efficient hepatic extraction of NE (86±6%) when measurements are restricted to arterial and hepatic venous plasma.

Original languageEnglish
Pages (from-to)1640-1646
Number of pages7
JournalJournal of Clinical Investigation
Volume97
Issue number7
Publication statusPublished - 1 Apr 1996

Keywords

  • liver
  • portal system
  • portal vein
  • splanchnic circulation
  • sympathetic nervous system

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