title: Plasma levels of microparticles at 24 weeks of gestation do not predict subsequent pregnancy complications.
abstract: OBJECTIVE
  To discern whether plasma levels of microparticles (MPs) measured at 24 weeks of gestation predict late complications of pregnancy.
  
  
  METHODS
  Secondary analysis of samples obtained prospectively.
  
  
  METHODS
  Large academic medical center.
  
  
  METHODS
  Two hundred sixty-two healthy women selected from 642 nulliparous women with singleton pregnancies.
  
  
  METHODS
  Sampling for blood cell MPs and thrombophilias at 24 weeks of gestation and measurements of blood flow resistance in uterine, placental, and umbilical arteries at 24 and 31 to 33 weeks of gestation.
  
  
  METHODS
  Relationship between levels of MPs and late pregnancy complications, thrombophilias, and blood flow resistance.
  
  
  RESULTS
  Flow cytometry only detected MPs derived from endothelial cells (CD31(+)) and platelet (CD41(+)). No statistically significant correlation was found between levels of CD31(+) or CD41(+) MPs and subsequent occurrence of pregnancy-induced hypertension, preeclampsia, intrauterine growth restriction, or small for gestational age infants. Nor was there a statistically significant correlation with blood flow resistance parameters at 24 weeks of gestation (except for the left uterine artery) or at 31 to 33 weeks of gestation. Levels of these MPs in thrombophilic and nonthrombophilic women were similar.
  
  
  CONCLUSIONS
  Levels of circulating MPs at 24 weeks of gestation had no predictive value for subsequent development of pregnancy-induced hypertension, preeclampsia, intrauterine growth restriction, or small for gestational age infants.
authors.affiliation: Amalia Biron Research Institute of Thrombosis and Hemostasis, Sheba Medical Center, Tel Hashomer and Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel. ophiras@sheba.health.gov.il
authors.forename: Ophira
authors.initials: O
authors.lastname: Salomon
authors.forename: Ben-Zion
authors.initials: BZ
authors.lastname: Katz
authors.forename: Rima
authors.initials: R
authors.lastname: Dardik
authors.forename: Tami
authors.initials: T
authors.lastname: Livnat
authors.forename: David M
authors.initials: DM
authors.lastname: Steinberg
authors.forename: Reuven
authors.initials: R
authors.lastname: Achiron
authors.forename: Uri
authors.initials: U
authors.lastname: Seligsohn
mesh_terms: D000328:Adult; D055252:Cell-Derived Microparticles / Q000378:metabolism*; D005260:Female; D005434:Flow Cytometry / Q000379:methods*; D006801:Humans; D011247:Pregnancy; D011248:Pregnancy Complications / Q000097:blood* / Q000175:diagnosis*; D011262:Pregnancy Trimester, Second; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity