Sarka Lisonkova1, Azar Mehrabadi2, Victoria M Allen3, Emmanuel Bujold4, Joan M G Crane5, Laura Gaudet6, Robert J Gratton7, Noor Niyar N Ladhani8, Olufemi A Olatunbosun9, K S Joseph1. 1. Department of Obstetrics and Gynaecology, University of British Columbia and the Children's and Women's Hospital and Health Centre of British Columbia, Vancouver BC; School of Population and Public Health, University of British Columbia, Vancouver BC. 2. Department of Obstetrics and Gynaecology, University of British Columbia and the Children's and Women's Hospital and Health Centre of British Columbia, Vancouver BC. 3. Department of Obstetrics and Gynaecology, Dalhousie University, Halifax NS. 4. Centre de recherché en biologie de la reproduction et Centre de recherché du CHU de Québec, Université Laval, Québec QC. 5. Department of Obstetrics and Gynecology, Memorial University, St. John's NL. 6. Department of Obstetrics and Gynecology, University of Ottawa, Ottawa ON. 7. London Health Sciences Centre, Department of Obstetrics and Gynaecology, London Western University, London ON. 8. Sunnybrook Health Sciences Centre, Toronto ON. 9. Department of Obstetrics and Gynecology and Reproductive Sciences, University of Saskatchewan, Saskatoon SK.
Abstract
OBJECTIVE: Atonic postpartum hemorrhage rates have increased in many industrialized countries in recent years. We examined the blood loss, risk factors, and management of the third stage of labour associated with atonic postpartum hemorrhage. METHODS: We carried out a case-control study of patients in eight tertiary care hospitals in Canada between January 2011 and December 2013. Cases were defined as women with a diagnosis of atonic postpartum hemorrhage, and controls (without postpartum hemorrhage) were matched with cases by hospital and date of delivery. Estimated blood loss, risk factors, and management of the third stage labour were compared between cases and controls. Conditional logistic regression was used to adjust for confounding. RESULTS: The study included 383 cases and 383 controls. Cases had significantly higher mean estimated blood loss than controls. However, 16.7% of cases who delivered vaginally and 34.1% of cases who delivered by Caesarean section (CS) had a blood loss of < 500 mL and < 1000 mL, respectively; 8.2% of controls who delivered vaginally and 6.7% of controls who delivered by CS had blood loss consistent with a diagnosis of postpartum hemorrhage. Factors associated with atonic postpartum hemorrhage included known protective factors (e.g., delivery by CS) and risk factors (e.g., nulliparity, vaginal birth after CS). Uterotonic use was more common in cases than in controls (97.6% vs. 92.9%, P < 0.001). Delayed cord clamping was only used among those who delivered vaginally (7.7% cases vs. 14.6% controls, P = 0.06). CONCLUSION: There is substantial misclassification in the diagnosis of atonic postpartum hemorrhage, and this could potentially explain the observed temporal increase in postpartum hemorrhage rates.
OBJECTIVE:Atonic postpartum hemorrhage rates have increased in many industrialized countries in recent years. We examined the blood loss, risk factors, and management of the third stage of labour associated with atonic postpartum hemorrhage. METHODS: We carried out a case-control study of patients in eight tertiary care hospitals in Canada between January 2011 and December 2013. Cases were defined as women with a diagnosis of atonic postpartum hemorrhage, and controls (without postpartum hemorrhage) were matched with cases by hospital and date of delivery. Estimated blood loss, risk factors, and management of the third stage labour were compared between cases and controls. Conditional logistic regression was used to adjust for confounding. RESULTS: The study included 383 cases and 383 controls. Cases had significantly higher mean estimated blood loss than controls. However, 16.7% of cases who delivered vaginally and 34.1% of cases who delivered by Caesarean section (CS) had a blood loss of < 500 mL and < 1000 mL, respectively; 8.2% of controls who delivered vaginally and 6.7% of controls who delivered by CS had blood loss consistent with a diagnosis of postpartum hemorrhage. Factors associated with atonic postpartum hemorrhage included known protective factors (e.g., delivery by CS) and risk factors (e.g., nulliparity, vaginal birth after CS). Uterotonic use was more common in cases than in controls (97.6% vs. 92.9%, P < 0.001). Delayed cord clamping was only used among those who delivered vaginally (7.7% cases vs. 14.6% controls, P = 0.06). CONCLUSION: There is substantial misclassification in the diagnosis of atonic postpartum hemorrhage, and this could potentially explain the observed temporal increase in postpartum hemorrhage rates.
Authors: Roy Lauterbach; Chen Ben David; Gal Bachar; Nizar Khatib; Michael Y Divon; Yaniv Zipori; Ron Beloosesky; Zeev Weiner; Yuval Ginsberg Journal: Arch Gynecol Obstet Date: 2021-09-21 Impact factor: 2.344
Authors: Annu-Riikka S Rissanen; Riina M Jernman; Mika Gissler; Irmeli Nupponen; Mika E Nuutila Journal: BMC Pregnancy Childbirth Date: 2019-09-18 Impact factor: 3.007
Authors: Wedad M Almutairi; Susan M Ludington; Mary T Quinn Griffin; Christopher J Burant; Ahlam E Al-Zahrani; Fatmah H Alshareef; Hanan A Badr Journal: Nurs Rep Date: 2020-12-25