The Effect of Reduced Perfusion Pressure and Regional Sympathetic Vasoconstrictor Activation on the Rate of Absorption of85Kr from the Small Intestine of the Cat

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Abstract
Svanvik, J.The effect of reduced perfusion pressure and regional sympathetic vasoconstrictor activation on the rate of absorption of85Kr from the small intestine of the cat.Acta physiol. scand. 1973.89.239–248.The absorption from the small intestinal lumen to the intestinal blood stream of an easily diffusable substance,85Kr, was studied in the cat during different hemodynamic conditions. When reducing arterial inflow pressure to the intestine from about 100 to 30 mm Hg the absorption rate was reduced in proportion to the venous outflow although an earlier study demonstrated an almost unchanged villous blood flow during corresponding experimental conditions. Also when raising the venous outflow pressure absorption rate decreased in proportion to venous outflow while during neurogenic reductions of intestinal blood flow the absorption rate was not significantly changed. The results are discussed mainly with regard to the intestinal mucosal hemodynamics and countercurrent exchanger.

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