Søndenaa K, Nesvik I, Nygaard K, Sauer T. Mucosal surface area of a reversed intestinal segment in rats.
Scand J Gastroenterol 1991;
26:1240-6. [PMID:
1763294 DOI:
10.3109/00365529108998620]
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Abstract
Only scarce knowledge exists of morphologic changes after antiperistaltic reversal of the small intestine. Previous animal models using a reversed segment of the small intestine after massive intestinal resection have been mostly concerned with assessing absorption. A rat model was therefore developed for the purpose of studying mucosal surface area in the small intestine after reversal of an intestinal segment. A reversal of 10 cm, representing a length of about 10%, was found suitable for the investigation. Marked dilatation of the reversed segment occurred. A pronounced increase in mucosal surface area caused by mucosal hyperplasia was observed. The mucosal surface area in an anastomosed, but not reversed, segment also increased markedly compared with a group undergoing no operation, although less than in the reversed segment. We conclude that a reversed intestinal segment will increase mucosal surface area in an optimal length used for this purpose. This increase is possibly caused by prolonged exposure to intestinal chyme.
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