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Endoscopy of the upper gastrointestinal tract was performed on 84 patients with end-stage chronic renal failure undergoing hemodialysis. Gastric acid secretion and fasting plasma gastrin levels were also examined in these patients. Hemorrhagic gastritis was most frequently observed (23 cases) followed by erosive gastritis (18 cases). No patients had gastric ulcers. Duodenal ulcers were observed in only two patients. Gastrointestinal bleeding was observed in 15 cases (17.9%). Thirteen of these 15 cases had hemorrhagic gastritis, one of which had a duodenal ulcer as a complication. Fasting plasma gastrin levels (359.6 +/- 336.5 pg/ml) were significantly higher than those of normal subjects (35.2 +/- 37.1 pg/ml), but no acceleration in gastric acid secretion was observed either in the basal condition (BAO 0.8 +/- 0.7 mEq/h) or following tetragastrin stimulation (MAO 9.0 +/- 6.9 mEq/h). Our results were inconsistent with the previous reports that high frequencies of peptic ulcers and increased gastric acid secretion were observed in patients with chronic renal failure. Our data suggest that the defensive factors rather than the aggressive factors of the gastroduodenal mucosa may be involved in chronic renal failure.
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