J.Jpn. Surg. Soc.. 57(9): 1571-1592, 1956

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EXPERIMENTAL STUDIES ON CIRCULATORY DISORDERS IN THE SMALL INTESTINE (ESPECIALLY ABOUT SURVIVAL RATE, PATHOLOGY AND INTESTINAL MOVEMENTS)

Survival rate, pathology of the intestine and changes of intestinal movements after legation or dissection in vessels of dogs between from vasa recta to the superior mesen­terial artery and vein, have been studied. The results are as follows.
(1) Dissection of vasa recta less than 5 cm was safe, but more than 6 cm caused death. Haemorrhagic infarkt was presented in pathological findings.
(2) In order to lengthen the range of dissection of vasa recta, dissection of 4 cm in two places and after 4 weeks dissection of 4 cm in the middle part were performed. However, dogs died of anaemic necrosis.
(3) In the above-described experiments, when the middle part remained 1 cm, death occurred. When than 2 cm, dogs survived.
(4) Dissection of the small intestinal artery in oral 1/3 of the intestine was safe, but that in anal 1/3 caused death from haemorrhagic infarkt. When the intestin perfused by the remaining artery was less than 20 cm dogs survived always.
(5) Dissection of the small intestinal vein in one place, even if in any place, dogs did not die. When dissection was performed in two or three places, death occurred in some cases, which the perfused intestine was more than 50 cm, the cause of death was a large quantity of bleeding in the intestinal lumen and the abdominal cavity.
(6) All dogs died within 24 hours after dissection of the superior mesenterial artery and vein. In arterial dissection haemorrhagic necrosis and perforative peritonitis were found and in venous dissection a large quantity of bleeding in the intestinal lumen and the abdominal cavity, without perforative peritonitis, were found.
(7) In creation of partial stenosis in the superior mesenterial artery when the was constricted to 1/2, survival was possible, but when to 1/3, dogs died.
(8) In the superior mesenterial vein, constriction of the circumference of 1/2, 1/3 and 1/4 did not cause death. Consequently, it is conceivable that in the superior mesenterial vein if only a very slight blood now was maintained dogs can survive.
(9) Changes of intestinal movements when partial stenosis of the superior mesenterial vasa was created with the use of Oettel's apparatus and Thiry-Vella's loop were observed. Both in 1/2 stenosis of the arterial circumference and 1/3 stenosis of the venous cireumference, changes of intestinal movements appeared for only a short time and normal movements recovered after one week.
(author's abstract)

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