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ACUTE INTRAVASCULAR HEMOLYSIS

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Acute Hemolytic Transfusion Reaction

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Acute transfusion reactions usually occur within minutes. The most common cause of an acute hemolytic transfusion reaction (AHTR) is a transfusion of incompatible red cells. The recipient must have antibodies to an antigen on the transfused cells. Most often the reaction is due to ABO incompatible blood; however, other antibodies may also be responsible.

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During these reactions, the lysis of erythrocytes results in hemoglobinemia and hemoglobinuria. Other laboratory findings with AHTR are decreased hematocrit, increased lactate dehydrogenase (LDH), increased serum bilirubin, and decreased haptoglobin.

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Clinical symptoms of AHTR include abdominal, chest, flank, or back pain, hypotension, bronchospasm, pulmonary edema, shock, renal failure, and disseminated intravascular coagulation (DIC). There are several important steps in its management (Table 187-1).

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Table Graphic Jump Location
TABLE 187-1Management of Acute Intravascular Hemolysis
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Acute Hemolysis Induced by Cell Trauma

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There are multiple causes of trauma to red blood cells that can result in hemolysis. Common causes of trauma include severe cardiac valve disease, prosthetic cardiac valves, vascular grafts, intraaortic balloon pumps, ventricular assist devices. In addition, the mixing of packed red blood cells with hypotonic solution or excessive warming of packed red blood cells can result in hemolysis. Severe burns can also cause hemolysis to exposed red blood cells.

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Glucose-6-Phosphate Dehydrogenase Deficiency

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A glucose-6-phosphate dehydrogenase (G6PD)-deficient patient lacks the ability to protect red blood cells against oxidation. Numerous drugs, infections, and metabolic conditions have been shown to cause acute hemolysis of red blood cells in the G6PD-deficient patient (Table 187-2). Management of this reaction involves blood transfusions for hemolysis. Occasionally, dialysis is needed for acute renal failure. When a blood transfusion is given, the transfused red cells are generally not G6PD-deficient and will live a normal lifespan in the recipient's circulation. Most commonly there is spontaneous recovery from a hemolytic episode due to G6PD.

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Table Graphic Jump Location
TABLE 187-2Drugs, Food and Conditions that cause Hemolysis in G6PD

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