The dynamics of the catecholamines content in the blood serum of the patients, suffering gastroduodenal ulcer, complicated by hemorrhage, was analyzed. The biggest raising of the investigated index level was observed in patients while presence of gastric cancer, complicated by hemorrhage. These changes correlate with the blood loss severity enhancement, the state of unstable endoscopic hemostasis, high activity of the inducible NO-synthase of the peri-ulceral zone mucosa. The data obtained permit to prognosticate the pathological process and to improve the treatment program.
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