Sympathectomy has been used to study the role of the sympathetic nervous system in the control of gastric acid secretion. Conflicting results may reflect differences in the sympathectomy procedures used. In a previous study we showed a reduction of catecholamines by more than 90% in the gut wall of the rat after surgical upper abdominal sympathectomy.
Scand J Gastroenterol. 1985 Dec;20(10):1276-80.
http://www.ncbi.nlm.nih.gov/pubmed/4095497