tailieunhanh - Chapter 042. Gastrointestinal Bleeding (Part 4)

Approach to the Patient: Gastrointestinal Bleeding Measurement of the heart rate and blood pressure is the best way to assess a patient with GIB. Clinically significant bleeding leads to postural changes in heart rate or blood pressure, tachycardia, and, finally, recumbent hypotension. In contrast, the hemoglobin does not fall immediately with acute GIB, due to proportionate reductions in plasma and red cell volumes (., "people bleed whole blood"). Thus, hemoglobin may be normal or only minimally decreased at the initial presentation of a severe bleeding episode. . | Chapter 042. Gastrointestinal Bleeding Part 4 Approach to the Patient Gastrointestinal Bleeding Measurement of the heart rate and blood pressure is the best way to assess a patient with GIB. Clinically significant bleeding leads to postural changes in heart rate or blood pressure tachycardia and finally recumbent hypotension. In contrast the hemoglobin does not fall immediately with acute GIB due to proportionate reductions in plasma and red cell volumes . people bleed whole blood . Thus hemoglobin may be normal or only minimally decreased at the initial presentation of a severe bleeding episode. As extravascular fluid enters the vascular space to restore volume the hemoglobin falls but this process may take up to 72 h. Patients with slow chronic GIB may have very low hemoglobin values despite normal blood pressure and heart rate. With the development of iron-deficiency anemia the mean corpuscular volume will be low and red blood cell distribution width will be increased. Differentiation of Upper from Lower GIB Hematemesis indicates an upper GI source of bleeding above the ligament of Treitz . Melena indicates that blood has been present in the GI tract for at least 14 h. Thus the more proximal the bleeding site the more likely melena will occur. Hematochezia usually represents a lower GI source of bleeding although an upper GI lesion may bleed so briskly that blood does not remain in the bowel long enough for melena to develop. When hematochezia is the presenting symptom of UGIB it is associated with hemodynamic instability and dropping hemoglobin. Bleeding lesions of the small bowel may present as melena or hematochezia. Other clues to UGIB include hyperactive bowel sounds and an elevated blood urea nitrogen level due to volume depletion and blood proteins absorbed in the small intestine . A nonbloody nasogastric aspirate may be seen in up to 18 of patients with UGIB usually from a duodenal source. Even a bile-stained appearance does not exclude a bleeding .

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• Gastrointestinal Bleeding
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