title: Outcomes of women presenting in active versus latent phase of spontaneous labor.
abstract: OBJECTIVE
  To evaluate outcome differences between women presenting in latent and active labor.
  
  
  METHODS
  We evaluated all low-risk women with term, singleton, vertex gestations who presented in active phase or latent phase labor at MetroHealth Medical Center from January 1993 to June 2001. Baseline characteristics were compared. Labor outcomes were assessed by logistic regression, controlling for parity.
  
  
  RESULTS
  A total of 6,121 active phase and 2,697 latent phase women met the study criteria. More latent phase women were nulliparous (51 compared with 28%). Latent phase women had more cesarean deliveries (nulliparas 14.2% compared with 6.7%, multiparas 3.1% compared with 1.4%). Controlling for parity, latent phase women had more active phase arrest (odds ratio [OR] 2.2), oxytocin use (OR 2.3), scalp pH performed (OR 2.2), intrauterine pressure catheter placed (OR = 2.2), fetal scalp electrocardiogram monitoring (OR = 1.7), and amnionitis (OR 2.7) (P < .001 for each).
  
  
  CONCLUSIONS
  It is uncertain whether inherent labor abnormalities resulted in latent phase presentation and subsequent physician intervention or early presentation and subsequent physician intervention are the cause of labor abnormalities.
authors.affiliation: Division of Maternal-Fetal Medicine, Department of Obstetrics and Gynecology, MetroHealth Medical Center, Case Western Reserve University, Cleveland, Ohio, USA. jbailit@metrohealth.org
authors.forename: Jennifer L
authors.initials: JL
authors.lastname: Bailit
authors.forename: LeRoy
authors.initials: L
authors.lastname: Dierker
authors.forename: May Hsieh
authors.initials: MH
authors.lastname: Blanchard
authors.forename: Brian M
authors.initials: BM
authors.lastname: Mercer
mesh_terms: D002585:Cesarean Section; D005260:Female; D006801:Humans; D007231:Infant, Newborn; D007745:Labor Onset; D007747:Labor Stage, First; D007744:Obstetric Labor Complications; D010298:Parity; D010343:Patient Admission; D011247:Pregnancy; D011256:Pregnancy Outcome