title: The role of serum apelin in retinopathy of prematurity.
abstract: OBJECTIVE
  To evaluate the role of serum apelin as a diagnostic tool in retinopathy of prematurity (ROP) disease.
  
  
  METHODS
  Thirty-eight preterm infants (60% male) with gestational age ranging from 30 to 36 weeks admitted to the neonatal intensive care unit, KJO Hospital, Saudi Arabia with proven diagnosis of ROP were included in the study. In addition, 27 preterm infants without ROP served as controls. All newborn infants in the study were subjected to adequate history taking, full clinical examination, and fundus examination by indirect ophthalmoscope (at 4-6 weeks) as well as determination of serum apelin at birth and at 4-6 weeks of age.
  
  
  RESULTS
  The study revealed that oxygen therapy longer than 7 days' duration, cesarean section (as a mode of delivery), sepsis, mechanical ventilation, blood transfusion, premature rupture of membranes, pneumothorax, perinatal asphyxia, cardiac problems, and neonatal jaundice were considered as risk factors related to development of ROP. Serum apelin levels were significantly lower in patients than controls (P<0.001) at time of diagnosis of the disease (4-6 weeks) while no significant differences were observed in levels at birth.
  
  
  CONCLUSIONS
  Serum apelin was found to be of significant diagnostic value in the occurrence of ROP.
authors.affiliation: Department of Pediatrics, Faculty of Medicine, Zagazig University, Zagazig.
authors.forename: Yasser F
authors.initials: YF
authors.lastname: Ali
authors.affiliation: Department of Pediatrics, Faculty of Medicine, Zagazig University, Zagazig.
authors.forename: Salah
authors.initials: S
authors.lastname: El-Morshedy
authors.affiliation: Department of Pediatrics, Al-Azhar Faculty of Medicine-Girls, Cairo.
authors.forename: Abdulbasit Abdulhalim
authors.initials: AA
authors.lastname: Imam
authors.affiliation: Department of Pediatrics, Faculty of Medicine, Zagazig University, Zagazig.
authors.forename: Nasser Ismai A
authors.initials: NI
authors.lastname: Abdelrahman
authors.affiliation: Pediatric Neurology Unit, Pediatric Department, Mansoura University, Mansoura, Egypt.
authors.forename: Riad M
authors.initials: RM
authors.lastname: Elsayed
authors.affiliation: Department of Pediatrics, Faculty of Medicine, Zagazig University, Zagazig.
authors.forename: Usama M
authors.initials: UM
authors.lastname: Alkholy
authors.affiliation: Department of Pediatrics, Faculty of Medicine, Zagazig University, Zagazig.
authors.forename: Nermin
authors.initials: N
authors.lastname: Abdalmonem
authors.affiliation: Department of Pediatrics, Faculty of Medicine, Zagazig University, Zagazig.
authors.forename: Mohammed M
authors.initials: MM
authors.lastname: Shehab
keywords: preterm infants; retinopathy of prematurity; serum apelin