Intrasphincteric Nitric Oxide Reduces Sphincter of Oddi Motility in an Endoscopic Porcine Model

Hideaki Niiyama, Sanjay Jagannath, Sergey Kantsevoy, Marcia Cruz-Correa, Carolyn Magee, Anthony N. Kalloo

Research output: Contribution to journalArticlepeer-review

10 Scopus citations


Nitric oxide (NO), a potent nonadrenergic, noncholinergic mediator of gastrointestinal smooth muscle, causes relaxation of the category I pump like sphincter of Oddi (SO) (eg, opossum, rabbit) and category II resistor like SO (eg, pig, human). Topical administration of a NO donor induces SO relaxation in humans, and parenteral administration of sodium nitroprusside (SNP) decreases sphincter contractility in pig SO. The aim of this study is to evaluate the effect of intrasphincteric SNP injection on pig SO. Under general anesthesia, two pigs received intrasphincteric saline injection (1 ml) and six pigs received intrasphincteric SNP (0.5 μg/ml) injection into the SO. All injections were administered into the major papilla using a 5-mm sclerotherapy needle through the duodenoscope. Endoscopic biliary manometry was performed using the standard station pull-through technique and SO pressures were recorded before and after injection. Intrasphincteric saline injection did not significantly change the mean SO motility index (MI) (197 vs 198). However, intrasphincteric SNP reduced both the mean SO basal pressure (P = 0.002) and the mean SO MI (226 vs 109; P = 0.002). The effect of intrasphincteric SNP lasted up to 45 min and did not cause significant lowering of systemic blood pressure. This is the first study to demonstrate that intrasphincteric SNP results in significant reduction in both SO basal pressure and SO MI in the porcine model. The endoscopic intrasphincteric administration of NO donor drugs is technically feasible and without observed systemic side effects.

Original languageEnglish (US)
Pages (from-to)2187-2190
Number of pages4
JournalDigestive diseases and sciences
Issue number11
StatePublished - Nov 2003


  • Intrasphincteric injection
  • Manometry
  • Motility
  • Nitric oxide
  • Pig
  • Sphincter of Oddi

ASJC Scopus subject areas

  • Physiology
  • Gastroenterology


Dive into the research topics of 'Intrasphincteric Nitric Oxide Reduces Sphincter of Oddi Motility in an Endoscopic Porcine Model'. Together they form a unique fingerprint.

Cite this