Elizabeth M Coviello1, Katherine L Grantz2, Chun-Chih Huang3, Tara E Kelly2, Helain J Landy4. 1. Department of Obstetrics and Gynecology, MedStar Washington Hospital Center, MedStar Georgetown University Hospital, Washington, DC; Department of Obstetrics and Gynecology, MedStar Georgetown University Hospital, Washington, DC. Electronic address: Elizabeth.coviello@gmail.com. 2. Department of Obstetrics and Gynecology, MedStar Georgetown University Hospital, Washington, DC. 3. Department of Biostatistics and Bioinformatics, MedStar Health Research Institute, Hyattsville, MD. 4. Department of Obstetrics and Gynecology, MedStar Georgetown University Hospital, Washington, DC; Division of Maternal Fetal Medicine, MedStar Georgetown University Hospital, Washington, DC.
Abstract
OBJECTIVE: Retained placenta complicates 2-3% of vaginal deliveries and is a known cause of postpartum hemorrhage. Treatment includes manual or operative placental extraction, potentially increasing risks of hemorrhage, infections, and prolonged hospital stays. We sought to evaluate risk factors for retained placenta, defined as more than 30 minutes between the delivery of the fetus and placenta, in a large US obstetrical cohort. STUDY DESIGN: We included singleton, vaginal deliveries ≥24 weeks (n = 91,291) from the Consortium of Safe Labor from 12 US institutions (2002-2008). Multivariable logistic regression analyses estimated the adjusted odds ratios (OR) and 95% confidence intervals (CI) for potential risk factors for retained placenta stratified by parity, adjusting for relevant confounding factors. Characteristics such as stillbirth, maternal age, race, and admission body mass index were examined. RESULTS: Retained placenta complicated 1047 vaginal deliveries (1.12%). Regardless of parity, significant predictors of retained placenta included stillbirth (nulliparous adjusted OR, 5.67; 95% CI, 3.10-10.37; multiparous adjusted OR, 4.56; 95% CI, 2.08-9.94), maternal age ≥30 years, delivery at 24 0/7 to 27 6/7 compared with 34 weeks or later and delivery in a teaching hospital. In nulliparous women, additional risk factors were identified: longer first- or second-stage labor duration, whereas non-Hispanic black compared with non-Hispanic white race was found to be protective. Body mass index was not associated with an increased risk. CONCLUSION: Multiple risk factors for retained placenta were identified, particularly the strong association with stillbirth. It is plausible that there could be something intrinsic about stillbirth that causes a retained placenta, or perhaps there are shared pathways of certain etiologies of stillbirth and a risk of retained placenta.
OBJECTIVE: Retained placenta complicates 2-3% of vaginal deliveries and is a known cause of postpartum hemorrhage. Treatment includes manual or operative placental extraction, potentially increasing risks of hemorrhage, infections, and prolonged hospital stays. We sought to evaluate risk factors for retained placenta, defined as more than 30 minutes between the delivery of the fetus and placenta, in a large US obstetrical cohort. STUDY DESIGN: We included singleton, vaginal deliveries ≥24 weeks (n = 91,291) from the Consortium of Safe Labor from 12 US institutions (2002-2008). Multivariable logistic regression analyses estimated the adjusted odds ratios (OR) and 95% confidence intervals (CI) for potential risk factors for retained placenta stratified by parity, adjusting for relevant confounding factors. Characteristics such as stillbirth, maternal age, race, and admission body mass index were examined. RESULTS: Retained placenta complicated 1047 vaginal deliveries (1.12%). Regardless of parity, significant predictors of retained placenta included stillbirth (nulliparous adjusted OR, 5.67; 95% CI, 3.10-10.37; multiparous adjusted OR, 4.56; 95% CI, 2.08-9.94), maternal age ≥30 years, delivery at 24 0/7 to 27 6/7 compared with 34 weeks or later and delivery in a teaching hospital. In nulliparous women, additional risk factors were identified: longer first- or second-stage labor duration, whereas non-Hispanic black compared with non-Hispanic white race was found to be protective. Body mass index was not associated with an increased risk. CONCLUSION: Multiple risk factors for retained placenta were identified, particularly the strong association with stillbirth. It is plausible that there could be something intrinsic about stillbirth that causes a retained placenta, or perhaps there are shared pathways of certain etiologies of stillbirth and a risk of retained placenta.
Authors: Mary E D'Alton; Alexander M Friedman; Peter S Bernstein; Haywood L Brown; William M Callaghan; Steven L Clark; William A Grobman; Sarah J Kilpatrick; Daniel F O'Keeffe; Douglas M Montgomery; Sindhu K Srinivas; George D Wendel; Katharine D Wenstrom; Michael R Foley Journal: Am J Obstet Gynecol Date: 2019-03-05 Impact factor: 8.661
Authors: Fiona C Denison; Kathryn F Carruthers; Jemma Hudson; Gladys McPherson; Graham Scotland; Sheonagh Brook-Smith; Cynthia Clarkson; Mathilde Peace; Jane Brewin; Gin Nie Chua; Nina Hallowell; Jane E Norman; Julia Lawton; John Norrie Journal: Health Technol Assess Date: 2019-12 Impact factor: 4.014
Authors: Fiona C Denison; John Norrie; Julia Lawton; Jane E Norman; Graham Scotland; Gladys C McPherson; Alison McDonald; Mark Forrest; Jemma Hudson; Jane Brewin; Mathilde Peace; Cynthia Clarkson; Sheonagh Brook-Smith; Susan Morrow; Nina Hallowell; Laura Hodges; Kathryn F Carruthers Journal: BMJ Open Date: 2017-09-18 Impact factor: 2.692