title: [Risk factors for patent ductus arteriosus in early preterm infants: a case-control study].
abstract: OBJECTIVE
  To investigate the risk factors for the occurrence of patent ductus arteriosus (PDA) and to provide a clinical basis for reducing the occurrence of PDA in early preterm infants.
  
  
  METHODS
  A total of 136 early preterm infants (gestational age≤32 weeks) who were hospitalized between January 2013 and December 2014 and diagnosed with hemodynamicalhy significant PDA (hs-PDA) were enrolled as the case group. Based on the matched case-control principle, 136 early preterm infants without hs-PDA were selected among those who were hospitalized within the same period at a ratio of 1:1 and enrolled as the control group. The two groups were matched for sex and gestational age. The basic information of neonates and maternal conditions during the pregnancy and perinatal periods were collected. Logistic regression analysis was performed to identify the risk factors for the development of PDA.
  
  
  RESULTS
  Univariate analysis showed that neonatal infectious diseases, neonatal respiratory distress syndrome, decreased platelet count within 24 hours after birth, and low birth weight were associated with the development of hs-PDA (P<0.05). Multivariate conditional logistic regression analysis revealed that neonatal infectious diseases (OR=2.368) and decreased platelet count within 24 hours after birth (OR=0.996) were independent risk factors for hs-PDA.
  
  
  CONCLUSIONS
  Neonatal infectious diseases and decreased platelet count within 24 hours after birth increase the risk of hs-PDA in early preterm infants.
authors.affiliation: First Hospital of Jilin University, Changchun 130000, China. wuhui97@126.com.
authors.forename: Jin-Feng
authors.initials: JF
authors.lastname: Du
authors.forename: Tian-Tian
authors.initials: TT
authors.lastname: Liu
authors.forename: Hui
authors.initials: H
authors.lastname: Wu
mesh_terms: D016022:Case-Control Studies; D004374:Ductus Arteriosus, Patent / Q000209:etiology*; D005260:Female; D006801:Humans; D007231:Infant, Newborn; D007234:Infant, Premature; D016015:Logistic Models; D008297:Male; D010976:Platelet Count; D012307:Risk Factors