title: Influence of the duration of the second stage of labor on fetal pH levels and oxidative status in uncomplicated pregnancies.
abstract: OBJECTIVE
  We examined the influence of the duration of the second stage of labor on fetal pH levels and oxidative status in uncomplicated pregnancies.
  
  
  METHODS
  Blood gases in the umbilical artery and serum uric acid and plasma malondialdehyde levels in the umbilical venous blood were measured at delivery in uncomplicated nulliparous women whose second stage of labor was 0-60 min (n = 38), 61-120 min (n = 14) and 121-180 min (n = 6).
  
  
  RESULTS
  There were no significant differences in the measured variables between the three groups.
  
  
  CONCLUSIONS
  The duration of the second stage of labor up to 3 h does not influence lipid peroxidation in the fetoplacental circulation in uncomplicated pregnancies.
authors.affiliation: Department of Obstetrics and Gynecology, Tokyo Rinkai Hospital, Tokyo, Japan.
authors.forename: S
authors.initials: S
authors.lastname: Suzuki
authors.forename: S
authors.initials: S
authors.lastname: Okudaira
mesh_terms: D000328:Adult; D001784:Blood Gas Analysis; D001786:Blood Glucose / Q000032:analysis; D005260:Female; D005312:Fetal Blood / Q000737:chemistry*; D006801:Humans; D006863:Hydrogen-Ion Concentration; D007748:Labor Stage, Second; D019344:Lactic Acid / Q000097:blood; D008315:Malondialdehyde / Q000097:blood; D011247:Pregnancy; D011446:Prospective Studies; D013997:Time Factors; D014469:Umbilical Arteries / Q000502:physiology; D014470:Umbilical Cord / Q000098:blood supply; D014471:Umbilical Veins / Q000502:physiology; D014527:Uric Acid / Q000097:blood
chemical_list: D001786:Blood Glucose; D014527:Uric Acid; D019344:Lactic Acid; D008315:Malondialdehyde