Sixteen patients underwent proximal gastric vagotomy (highly selective vagotomy) for chronic duodenal ulceration. All were subjected to preoperative and postoperative acid secretion studies. A reduction in the secretory response to pentagastrin and abolition of the response to meat extract occurred postoperatively.
Plasma gastrin levels in response to meat extract were studied by radioimmunoassay. Basal plasma gastrin levels were unaffected by vagotomy and it was found that the plasma gastrin response to meat extract was not impaired after operation if the postoperative insulin test was positive. Only if the insulin test was negative was the amount of gastrin released by meat extract reduced.
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