title: [Causes of active phase arrest].
abstract: OBJECTIVE
  To evaluate factors affecting active phase arrest.
  
  
  METHODS
  Retrospective study from 1992 to 1994 was performed. A total of 166 pregnant women were included, 83 in to the active phase arrest group and 83 in normal group.
  
  
  RESULTS
  There were significant differences in the average birth weight and the prevalence of abnormal fetal presentation between the 2 groups. The time length of the latent phase was another factor influencing active phase arrest.
  
  
  CONCLUSIONS
  With normal pelvis, the high birth weight, abnormal presentation and prolonged latent phase were active phase arrest.
authors.affiliation: First Teaching Hospital, Beijing Medical University.
authors.forename: Y
authors.initials: Y
authors.lastname: Gao
authors.forename: B
authors.initials: B
authors.lastname: Wu
mesh_terms: D000328:Adult; D001724:Birth Weight; D036861:Delivery, Obstetric; D004420:Dystocia / Q000209:etiology*; D005260:Female; D006801:Humans; D007746:Labor Presentation; D007747:Labor Stage, First; D011247:Pregnancy; D012189:Retrospective Studies; D013997:Time Factors