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Necrotizing enterocolitis is uncommon among term infants. In this group, necrotizing enterocolitis has been associated with two risk factors: polycythemia and umbilical catheterization. During a randomized trial of partial plasma exchange transfusion for treatment of polycythemia, an increased risk of gastrointestinal problems was noted. Eight hyperviscous patients treated with partial plasma exchange transfusion, no symptomatically treated patients, and no control infants developed typical necrotizing enterocolitis (blood in the stools, pneumatosis, and systemic signs). The incidence of necrotizing enterocolitis was significantly greater among patients treated with exchange transfusion compared with patients treated symptomatically or control subjects (P less than .001).
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