title: [Investigation on factors related to pyelic separation in early newborns].
abstract: OBJECTIVE
  To explore the relationship of pyelic separation with gestational age, body weight and sex in early newborns.
  
  
  METHODS
  A total of 320 neonates were examined by renal ultrasound 2-7 days after birth. The neonates included 180 boys and 140 girls, with a mean gestational age of 36±3 weeks (28-42 weeks) and a mean birth weight of 2430±1000 g (900-4870 g). Correlation analysis was performed between renal pelvis anteroposterior diameter (APD) and gestational age/body weight. The newborns were grouped based on gestational age, body weight and sex and the incidence of pyelic separation was compared among the groups.
  
  
  RESULTS
  Pyelic separation was found in 100 of the 320 newborns. The incidence of pyelic separation in boys (37.8%, 70 cases) was significantly higher than in girls (22.2%, 30 cases) (P<0.05). The incidence rates of pyelic separation on the left side, right side and both sides were 59%, 13% and 29% respectively in boys, and 53%, 7% and 40% respectively in girls. There was no significant difference in the location of renal pelvis separation between boys and girls (P>0.05). There significant difference in the incidence of pyelic separation between different gestational age groups (P>0.05). APD was positively correlated with gestational age and birth weight (P<0.05). The incidence of pyelic separation was negatively correlated with birth weight in all newborns except those who were macrosomic (P<0.05).
  
  
  CONCLUSIONS
  The incidence of pyelic separation in early newborns is closely associated with birth weight and sex. APD is positively correlated to gestational age and birth weight. Pyelic separation often occurs more frequently on the left side or both sides than on the right side.
authors.affiliation: Neonatal Intensive Care Unit, First Affiliated Hospital of Zhengzhou University, Zhengzhou 450052, China. jsbwn@yahoo.com.cn
authors.forename: Qian
authors.initials: Q
authors.lastname: Zhang
authors.forename: Yan
authors.initials: Y
authors.lastname: Li
authors.forename: Xiao
authors.initials: X
authors.lastname: He
authors.forename: Shu-Ling
authors.initials: SL
authors.lastname: Xu
authors.forename: Hong-Xiang
authors.initials: HX
authors.lastname: Guo
authors.forename: Xin-Ru
authors.initials: XR
authors.lastname: Cheng
mesh_terms: D001724:Birth Weight; D005260:Female; D005865:Gestational Age; D006801:Humans; D007231:Infant, Newborn; D007682:Kidney Pelvis / Q000473:pathology*; D008297:Male; D014513:Ureter / Q000473:pathology*