Presentation of Case A 37-year-old man was admitted to the hospital because of recurrent hematochezia of six days' duration. The patient was well until six days earlier, when hematochezia occurred. The next day he again passed fresh blood per rectum, with a loss of “several cups” of blood. He experienced orthostatic weakness, dizziness, nausea, and syncope and was taken to another hospital, where physical examination showed that the blood pressure was 100 mm Hg systolic. Fluids were given by vein, and his condition was hemodynamically stable thereafter. The hematocrit, determined after the administration of fluids, was 24 percent. On the.
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