title: Do placental histologic findings of chorion-decidual hemorrhage or inflammation in spontaneous preterm birth influence outcomes in the subsequent pregnancy?
abstract: BACKGROUND
  Spontaneous preterm birth (SPTB) is the common endpoint of different underlying etiologies, including chorion-decidual bleeding and inflammation. However, specific histologic findings from a prior pregnancy do not always inform clinical management in subsequent pregnancies secondary to few prior studies having evaluated the relationship between prior pregnancy pathology and subsequent outcomes in patients with SPTB.
  
  
  METHODS
  Included subjects had: 1) a SPTB with available placental pathology and 2) a subsequent consecutive delivery at >20 weeks gestational age at our institution. For included subjects archived placenta and membrane paraffin blocks from the index SPTB were cut, stained with Prussian Blue and evaluated by a perinatal pathologist for the presence of hemosiderin. The association between histologic findings and subsequent pregnancy outcomes were evaluated through logistic and linear regression.
  
  
  RESULTS
  A total of 131 subjects were included, of whom 39.7% had a recurrent SPTB. Funisitis at the time of preterm delivery significantly increased the risk of early (<34 weeks) recurrent preterm birth (OR 3.38, p = 0.016), though this may have been confounded by gestational age at delivery. Several histologic features were significantly associated with reductions in birth weight in the subsequent pregnancies, even if they did not increase the risk of recurrent preterm birth.
  
  
  CONCLUSIONS
  The presence of chorion-decidual bleeding or inflammation in a prior pregnancy can signal an increased risk in a future pregnancy beyond the recurrent risk of SPTB itself.
  
  
  CONCLUSIONS
  Placental histologic findings after SPTB maybe associated with differences in birth weight in a subsequent pregnancy.
authors.affiliation: Division of Maternal-Fetal Medicine, Department of Obstetrics and Gynecology, University of Rochester School of Medicine, 601 Elmwood Ave, Rochester, NY 14642, USA. Electronic address: David.Hackney@UHhospitals.org.
authors.forename: D N
authors.initials: DN
authors.lastname: Hackney
authors.affiliation: Division of Maternal-Fetal Medicine, Department of Obstetrics and Gynecology, University of Rochester School of Medicine, 601 Elmwood Ave, Rochester, NY 14642, USA. Electronic address: Radhika.Tirumala@rochestergeneral.org.
authors.forename: R
authors.initials: R
authors.lastname: Tirumala
authors.affiliation: Division of Maternal-Fetal Medicine, Department of Obstetrics and Gynecology, University of Rochester School of Medicine, 601 Elmwood Ave, Rochester, NY 14642, USA. Electronic address: Linda_Salamone@URMC.Rochester.edu.
authors.forename: L J
authors.initials: LJ
authors.lastname: Salamone
authors.affiliation: Division of Maternal-Fetal Medicine, Department of Obstetrics and Gynecology, University of Rochester School of Medicine, 601 Elmwood Ave, Rochester, NY 14642, USA. Electronic address: RichardK_Miller@URMC.Rochester.edu.
authors.forename: R K
authors.initials: RK
authors.lastname: Miller
authors.affiliation: Department of Pathology, University of Rochester School of Medicine, 601 Elmwood Ave, Rochester, NY 14642, USA. Electronic address: Philip_Katzman@URMC.Rochester.edu.
authors.forename: P J
authors.initials: PJ
authors.lastname: Katzman
mesh_terms: D000328:Adult; D001724:Birth Weight; D002821:Chorioamnionitis / Q000473:pathology; D002823:Chorion / Q000473:pathology*; D003656:Decidua / Q000473:pathology*; D005260:Female; D005865:Gestational Age; D006470:Hemorrhage / Q000150:complications*; D006801:Humans; D007231:Infant, Newborn; D007249:Inflammation / Q000150:complications; D007752:Obstetric Labor, Premature / Q000473:pathology; D010920:Placenta / Q000473:pathology*; D010922:Placenta Diseases / Q000473:pathology*; D011247:Pregnancy; D011256:Pregnancy Outcome; D047928:Premature Birth / Q000473:pathology; D012189:Retrospective Studies
keywords: Chorioamnioitis; Chorion-decidual hemorrhage; Hemosiderin; Intrauterine growth restriction; Placental pathology; Preterm birth