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Relation of intestinal motility to venous outflow and saturation of blood O2 through mesenteric blood vessels.

The effects of tonic and rhythmic contraction of the gut on venous blood flow and oxygen saturation in venous blood through an intestinal segment were investigated in anesthetized dogs.Intestinal contraction caused periodicity not only in venous outflow but also in oxygen saturation in venous blood.(1) It was observed in tonic contraction that augmentation of venous outflow synchronized with reduction of oxygen saturation in venous blood and that diminution of venous outflow produced an increase of oxygen saturation in venous blood.(2) In rhythmic contraction, the correlation between venous outflow and oxygen saturation in venous blood could be classified into two patterns. In the first pattern fluctuations of venous outflow corresponded reciprocally to fluctuations of oxygen saturation, and in the second pattern both curves fluctuated parallel to each other.The mechanism of the correlation between venous outflow and oxygen saturation in venous blood in each type is discussed.