الفهرس 
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Abstract
The experimental work was done on twenty-eight mongrel clinically healthy dogs. The animals were allotted into three groups each of seven animals with the exception of group number three which have fourteen animals.
The group one was used as a control. The animals of group two were subjected to sudden occlusion of the cranial mesenteric artery. While the animals of group three were treated by resection of the infarced bowel. Blood picture, biochemical analysis and the histopathological examination were carried out on the animals of group II.
Experiments on doge showed that, the cranial mesenteric artery was accessible at 11 cm. from the mesenteric border. Occlusion at this seat prevented blood supply in jejunal arteries numbers from 7 to 16. Thus about 90 cm. of the jejunum became devascularized.
Results of experimental work demonstrated significant and early elevation in serum levels of inorganic phosphate and amlyase, lactic dehydrogenase and alkaline phophatase enzymatic activities.
• Under the condition of the experiment, cranial mesenteric artery
ligation was fatal within nine to eleven days, after totoal occlusion and caused progressive destruction of the bowel from the mucosa outwards, but no perforation. These observations emphasize the urgency with which treatment must proceed when acute mesenteric ischemia is suspected.
Resection of the infarced bowel was carried out on the third and sixth days after occlusion of the cranial mesenteric artery and gave a rate of success about 71% and 14% respectively.
It could be concluded that intestinal ischemia with ensuing gangrene has been a serious clinical problem causing marked changes of various biochemical blood parameters. Delay in the.diagnosis has inevitably led to either massive gut resection or death. from the obtained results we recommended rapid surgical interference to remove the infarced portion of the intestine. The surgical approach to this catastrophe is considered as immediate survival and preservative of a nutritionally adequate length of the small intestine.