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Intestinal protein loss was determined in a group of patients with gastric resection by measuring the faecal radioactivity in the stools of 4 days, after intravenous administration of Cl3Cr51. The patients studied were divided in three groups: a) 10 healthy control subjects, b) 5 patients with gastrectomy BII without steatorrhoea, c) 15 patients with gastrectomy BII with steatorrhoea. In group (a) faecal radioactivity was 0.36 +/- 0.26% of the administrated dosis; in group (b) the value was 1.24 +/- 1.07% and in group (c) the activity was 1.40 +/- 1%. Statistically significative difference between groups (a) and (b) ((p less than 0.05) was found between groups (a) and (c) the difference was highly significative (p less than 0.001). However there was no significative difference between groups (b) and (c) (p less than 0.8). We think that serum protein intestinal loss may be, one of the causes of the hipoalbuminemia present in some patients who underwent partial gastrectomy because of gastroduodenal ulcer. Otherwise we did not find a relation between protein loss and steatorrhoea.

Unlabelled: In previous study in our laboratory, we had shown the effect of radiation on morphometry of small bowel of rats after 7 days of a single external doses of 1,000 rads with liver protection. Our aim was to determine the effect of the same procedure of gamma radiation in rats on the morphometry and D-Xylose absorption 7, 14 and 21 days after injury and compared with a control group matched by weight. The D-Xylose absorption was measured by plasmatic D-Xylose, 60' after an intragastric doses of the pentose (0.5 grs/kg of body weight)., Results: In the control group the mucosal thickness was 880 +/- 40 mu (X +/- SD), the vellous height was 640 +/- 37.6 mu and the xylosemia 15.91 +/- 11.39 mg%. At 7 days in the irradiated group (n: 11) the weight decreased 33.36 +/- 6.29% (Vs. control p less than .001), the mucosal thickness and the vellous height were 666 +/- 97 (p less than .001) and 466 +/- 66.9 mu (p less than .001) and the xylosemia 6.16 +/- 2.3 (p less than .05). The figures at 14 days (n: 16) showed improving and completed recovery at 21 days (n: 14). Irradiated rats were shown to be affected in weight, morphology and D-Xylose absorption, they began recovering after 7 days, and completed recovery at 21 days.