[Gastrointestinal hemorrhage: how much evaluation is necessary?].

For this study data from a total of 362 patients covering a time period of 10 years (1979-1989) were analyzed. Referal to the medical outpatient clinic of Zurich occurred in over 90% of the cases for evaluation of incidental iron deficiency anemia or suspected of gastrointestinal bleeding because of melanea/hematemesis. The evaluation comprised endoscopy, in part radiography of the upper intestinal tract and rarely angiography and scintigraphic tracer studies. 95 patients (26%) had benign lesions in the gastro-intestinal tract, 88 patients (26%) had endoscopy without abnormal findings. Iron deficiency was thought to be due to hypermenorrhea in 45 patients (13%) and to other non-gastrointestinal causes in 43 patients (13%) by exclusion. A malignancy of the gastrointestinal tract was found in 25 patients (7%): 18 carcinomas of the colon, 6 carcinomas of the stomach and 1 metastasis of a melanoma to the coecum. In 80% of the patients with malignancies occult fecal blood was detected. In 154 patients (42%) extensive diagnostic investigation including sometimes even repeated endoscopy could not disclose the cause of blood loss. 88 (24%) of these patients had slight iron deficiencies (hemoglobin > 10 g/dl, hemoccult-test positive in 65% of cases), 66 (18%) had severe iron-deficiencies (hemoglobin < 10 g/dl, hemoccult-test positive in 90% of cases). Selective small bowel radiography was performed in 36 patients without any positive findings. Patients with gastro-intestinal bleeding of undetermined etiology present a diagnostic challenge for the general practitioner.(ABSTRACT TRUNCATED AT 250 WORDS)