title: Interleukin-8 and glucose in amniotic fluid, fetal fibronectin in vaginal secretions and preterm labor index based on clinical variables are optimal predictive markers for preterm delivery in patients with intact membranes.
abstract: OBJECTIVE
  Various predictive markers for preterm delivery have been proposed in previous studies. We investigated which marker is most reliable.
  
  
  METHODS
  In 126 patients with preterm labor before 32 weeks of gestation and intact membranes, who had regular uterine contractions with cervical changes effaced > or =50%, we evaluated seven markers: interleukin (IL)-8, glucose, and granulocyte count in amniotic fluid (AF); fetal fibronectin (fFN) in vaginal secretions; IL-8 in cervical mucus; cervical length; and preterm labor index (PLI) based on clinical variables. The relationships of these variables to the occurrence of preterm delivery before 34 weeks were examined by logistic regression analysis.
  
  
  RESULTS
  Values for AF IL-8, AF granulocyte count, fFN in vaginal secretions, and PLI were significantly higher, while the value for AF glucose was significantly lower, in patients delivering before 34 weeks than those in patients delivering at or following 34 weeks (P < 0.0001 for all). The most sensitive marker for predicting delivery before 34 weeks was AF IL-8 (sensitivity, 67.8%). The most specific markers were AF IL-8 (specificity, 95.5%) and PLI (specificity, 95.5%). By the logistic regression analysis, AF IL-8, AF glucose, fFN in vaginal secretions and PLI showed independent relationships with delivery before 34 weeks (P = 0.0009, P = 0.0032, P = 0.0131 and P = 0.0038, respectively).
  
  
  CONCLUSIONS
  In preterm labor with intact membranes, AF IL-8, AF glucose, fFN in vaginal secretions and PLI were highly predictive markers for detecting preterm delivery before 34 weeks.
authors.affiliation: Department of Obstetrics and Gynecology, Toyama University, Toyama, Japan.
authors.forename: Satoshi
authors.initials: S
authors.lastname: Yoneda
authors.forename: Masatoshi
authors.initials: M
authors.lastname: Sakai
authors.forename: Yasushi
authors.initials: Y
authors.lastname: Sasaki
authors.forename: Arihiro
authors.initials: A
authors.lastname: Shiozaki
authors.forename: Takao
authors.initials: T
authors.lastname: Hidaka
authors.forename: Shigeru
authors.initials: S
authors.lastname: Saito
mesh_terms: D000293:Adolescent; D000328:Adult; D000653:Amniotic Fluid / Q000737:chemistry*; D015415:Biomarkers / Q000032:analysis; D005321:Extraembryonic Membranes; D005260:Female; D005326:Fetal Proteins / Q000032:analysis* / Q000378:metabolism; D005353:Fibronectins / Q000032:analysis* / Q000378:metabolism; D005947:Glucose / Q000032:analysis*; D006801:Humans; D016209:Interleukin-8 / Q000032:analysis*; D007752:Obstetric Labor, Premature / Q000175:diagnosis*; D011237:Predictive Value of Tests; D011247:Pregnancy; D012189:Retrospective Studies; D014621:Vagina / Q000737:chemistry* / Q000378:metabolism
chemical_list: D015415:Biomarkers; D005326:Fetal Proteins; D005353:Fibronectins; D016209:Interleukin-8; D005947:Glucose