no patients were included

Necrotizing enterocolitis (NEC) is a leading cause of mortality among preterm infants.The pathogenesis of NEC remains unclear with conflicting data regarding the role of red blood cell (RBC) transfusion and anemia. A meta-analysis of retrospective studies demonstrated an association between exposure to RBC transfusion and NEC(adjusted odds ratio, 2.0 [95% confidence interval, 1.6-2.5]). However, recent observational studies have found no association between RBC transfusion and NEC or have found RBC transfusion to be protective.

Improving understanding of the role of RBC transfusion and anemia in the development of NEC is important. Several studies characterizing the associations between transfusion, anemia, and NEC were potentially limited by small sample size, study design. As such, researchers have underscored the need for prospective study in which each RBC exposure, episode of anemia, and outcome of NEC can be systematically and consistently evaluated.

This prospective study examined whether RBC transfusion and anemia were associated with the rate of NEC. The primary objective was to test whether NEC was increased in infants receiving RBC transfusion compared with non transfused infants. Further, exposure to severe neonatal anemia was examined as an independent risk factor for NEC.

Inclusion Criteria:

• age between 1 min and 28 days
• the level blood bilirubin reached the criteria of transfusion therapy

Exclusion Criteria:

• congenital abnormalities
• receipt of transfusion before enrollment
• parents' decision not to participate
• infant not expected to survive beyond 7 days of life based on the assessment by the treating neonatologist

The level of blood bilirubin of the included neonatal infants reached the cirteria of transfusion therapy. Whether or not the transfusion therapy was dicided according to the parents' decision.