title: Prolonged labour attributed to large fetus.
abstract: The aim of this study is to assess the interactive dynamics of power, passenger and passage in relation to an adverse course of labour. The design was a community-based follow-up of all women with singleton pregnancies experiencing spontaneous term labour. Median of first stage was 2.6 h for multiparas and 3.7 h for primiparas. Median of second stage was 20 min for multiparas and 91 min for primiparas. Heavy birth weight significantly influenced a prolonged late first stage OR 6.6 (CI 2.1-21) and second stage of labour OR 4. 5 (CI 1.5-14) among primiparas. The attributable proportions of heavy birth weight for prolonged labour were 19-21%. Large paediatric head circumference showed a positive correlation to prolonged late first stage OR 3.2 (CI 1.2-9) and intervention OR 7.2 (CI 1.8-35), with an attributable proportion of 22%. For multiparas no significant association were found. To conclude, this study indicates that heavy birth weight and large head circumference contribute to 1/5th of the prolongation of labour and interventions among primiparas.
authors.affiliation: Obstetrics and Gynecology, Department of Clinical Science, Umeâ University, Sweden. ulf.hogberg@obstgyn.umu.se
authors.forename: U
authors.initials: U
authors.lastname: Högberg
authors.forename: M
authors.initials: M
authors.lastname: Lekâs Berg
mesh_terms: D001827:Body Height; D004420:Dystocia / Q000209:etiology; D005260:Female; D020567:Fetal Weight; D006801:Humans; D007747:Labor Stage, First; D007748:Labor Stage, Second; D007744:Obstetric Labor Complications / Q000209:etiology*; D010298:Parity; D011247:Pregnancy; D013997:Time Factors