title: Effect of the duration of labor on postpartum postvoid residual bladder volume.
abstract: In order to investigate the possibility of protracted labor as a risk factor for postpartum urinary retention and to study the relation between duration of labor and postpartum day 1 postvoid residual bladder volume, the postpartum postvoid residual bladder volume (PVRBV) of a group of patients was studied using ultrasonography. Out of 707 patients investigated during a 2-month study period, a homogeneous group of 164 patients, with possible risk factors for postpartum urinary retention being controlled, was studied. The homogeneous group's postpartum day 1 postvoid residual bladder volumes were assessed by ultrasonography and analyzed with respect to the duration of labor. The incidence of postpartum urinary retention ( > or = 150 ml) was 11% in this homogeneous group. Labor duration longer than or equal to 800 min was associated with a higher incidence of postpartum urinary retention (chi2 test; p < 0.05). Moreover, there is a direct relationship between the duration of labor and PVRBV which is described by a quadratic regression curve. Protracted labor longer than or equal to 800 min is a risk factor for postpartum urinary retention. The PVRBV is directly related to the duration of labor.
authors.affiliation: Department of Obstetrics and Gynaecology, Prince of Wales Hospital, Chinese University of Hong Kong, Shatin, NT. yipsk@cuhk.edu.hk
authors.forename: S K
authors.initials: SK
authors.lastname: Yip
authors.forename: L Y
authors.initials: LY
authors.lastname: Hin
authors.forename: T K
authors.initials: TK
authors.lastname: Chung
mesh_terms: D005260:Female; D006801:Humans; D007743:Labor, Obstetric / Q000502:physiology*; D011247:Pregnancy; D011446:Prospective Studies; D011644:Puerperal Disorders; D012044:Regression Analysis; D012307:Risk Factors; D013997:Time Factors; D014463:Ultrasonography; D001743:Urinary Bladder / Q000000981:diagnostic imaging*; D016055:Urinary Retention / Q000000981:diagnostic imaging / Q000209:etiology*