新生儿红细胞增多症是新生儿较常见疾病,对有症状的新生儿进行部分换血治疗已无争议[1]。但由于常因动脉穿刺困难,放血量不足导致达不到治疗目的,并且部分换血治疗者本身可引起贫血[2,3],使坏死性小肠结肠炎发病率增加[1],引起血容量不足和感染等合并症。因此,我们用低分子右旋 Neonatal polycythemia is a more common neonatal disease, symptomatic neonatal partial transfusional treatment has been no controversy [1]. However, due to difficulties often due to arterial puncture, lack of blood lead to reach the purpose of treatment, and part of the transfusion of blood treatment itself can cause anemia [2,3], so that the incidence of necrotizing enterocolitis increased [1], causing blood volume Insufficient and infection and other complications. Therefore, we use low molecular dextrorotatory