J.Jpn. Surg. Soc.. 84(3): 223-231, 1983

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Original article

STUDIES ON INFERIOR MESENTERIC ARTERIAL STUMP BLOOD PRESSURE AND OF AORTOGRAPHIC FINDINGS OF SURGICAL CASES OF ABDOMINAL AORTIC ANEURYSM: IN RELATION TO ISCHEMIC COLITIS

In 18 cases with unruptured abdominal aortic aneurysm, preoperative aortographic fmdings and the mean ratio of inferior mesenteric arterial stump blood pressure to systemic blood pressure (IMA/Syst. Pr. Ratio) were analized. In all cases IMA was ligated at operation because IMA/Syst. Pr. Ratio was more than 0.4, and one developed ischemic colitis.
Preoperative aortogram was useful to identify meandering mesenteric artery and its flow direction to predict colon ischemia.lMA/Syst. Pr. Ratio following aortic reconstruction ranged from 0.41 to 1.0 with mean value of 0.70. In a case of ischemic colitis the ratio was the lowest value (0.5) except one case. Thus the ratio had diagnostic value to predict colon ischemia.
Aortogram and IMA/Syst. Pr. Ratio were summed up to evaluate collateral circulation to colonic blood supply. Hypogastric arteries played an important role in some cases with intact IMA, and meandering mesenteric artery frequently in caese with occluded IMA. Consequently, it is important to preserve hypogastric arterial blood flow especially in the cases with intact IMA.
In two cases whose internal iliac arteries were ligated bilateraly, IMA stump pressyrew as enough, and ischemic colitis was not encounered. The problemes of peripheral vascular reconstruction in these two cases were also discussed.

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