Hospital discharge data is not accurate enough to monitor the incidence of postpartum hemorrhage

Postpartum haemorrhage in nulliparous women: incidence and risk factors in low and high risk women: A Dutch population-based cohort study on standard (≥500 ml) and severe (≥1000 ml) postpartum haemorrhage

To quantify the contribution of placenta accreta to the rate of postpartum hemorrhage and severe postpartum hemorrhage. All hospital deliveries in Canada (excluding Quebec) for the years 2009 and 2010 (N=570,637) were included in a retrospective cohort study using data from the Canadian Institute for Health Information. Placenta accreta included placental adhesion to the uterine wall, musculature, and surrounding organs (accreta, increta, or percreta). Severe postpartum hemorrhage included postpartum hemorrhage with blood transfusion, hysterectomy, or other procedures to control bleeding (including uterine suturing and ligation or embolization of pelvic arteries). Rates, rate ratios, population-attributable fractions (ie, incidence of postpartum hemorrhage attributable to placenta accreta), and 95% confidence intervals (CIs) were estimated. Logistic regression was used to quantify associations between placenta accreta and risk factors. The incidence of placenta accreta was 14.4 (95% CI 13.4-15.4) per 10,000 deliveries (819 cases among 570,637 deliveries), whereas the incidence of placenta accreta with postpartum hemorrhage was 7.2 (95% CI 6.5-8.0) per 10,000 deliveries. Postpartum hemorrhage among women with placenta accreta was predominantly third-stage hemorrhage (41% of all cases). Although placenta accreta was strongly associated with postpartum hemorrhage (rate ratio 8.3, 95% CI 7.7-8.9), its low frequency resulted in a small population-attributable fraction (1.0%, 95% CI 0.93-1.16). However, the strong association between placenta accreta and postpartum hemorrhage with hysterectomy (rate ratio 286, 95% CI 226-361) resulted in a population-attributable fraction of 29.0% (95% CI 24.3-34.3). Placenta accreta is too infrequent to account for the recent temporal increase in postpartum hemorrhage but contributes substantially to the proportion of postpartum hemorrhage with hysterectomy.

BackgroundLow-molecular-weight heparin (LMWH) is the drug of choice to prevent venous thrombosis in pregnancy, but the optimal dose for prevention while avoiding bleeding is unclear. This study investigated whether therapeutic...

In view of the current clinical inaccuracies and underestimations of postpartum hemorrhage amount, this study aims to investigate the incidence, etiology, clinical characteristics of postpartum hemorrhage in different modes of delivery based on the combination of volumetric method, gravimetric method and area method in evaluating blood loss. This retrospective cohort study was conducted in Hangzhou Women's Hospital from January 2020 to June 2021, including 725 cases of postpartum hemorrhage among 18,977 parturients. Based on different modes of delivery, the participants were divided into three groups: vaginal delivery, forceps delivery, and cesarean section, for comparison. Using an improved combined assessment method for blood loss, we retrospectively analyzed a cohort of parturients with postpartum hemorrhage who underwent vaginal delivery, forceps delivery, or cesarean section and were hospitalized in Hangzhou Women's Hospital from January 2020 to June 2021. (1) Among the 18,977 parturients, 725 cases of postpartum hemorrhage occurred, with an incidence rate of 3.8%, and severe postpartum hemorrhage accounted for 0.4% of the cases. (2) The incidence of postpartum hemorrhage was significantly higher in the forceps delivery group than in the vaginal delivery group (χ2 = 19.27, P<0.001), while the incidence of severe postpartum hemorrhage was significantly higher in the cesarean section group than in the vaginal delivery group (χ2 = 8.71, P = 0.003). (3) The causes of postpartum hemorrhage were statistically different among the different delivery modes, with varying underlying factors (P<0.001). (4) Patients with postpartum hemorrhage in different delivery modes showed statistically significant differences in age, body mass index (BMI), birth weight, gestational age, gravidity, parity, the decline of postpartum peripheral blood hemoglobin concentration, and estimated blood loss (P<0.05). (5) The proportion of blood transfusion was significantly higher in the cesarean section group than in the vaginal delivery and forceps delivery groups (χ2 = 231.03, P<0.001). This study is a single-center retrospective study, which may have led to selection bias in case selection. Additionally, the implementation of the combined three blood loss assessment methods may not have been strictly followed in all cases. Moreover, due to the mixing of bleeding with amniotic and irrigation fluids, the accuracy of evaluation may have been affected, leading to the possibility of inaccuracy of blood loss. Forceps delivery and cesarean section increase the risk of postpartum hemorrhage, but forceps delivery does not significantly increase the incidence of severe postpartum hemorrhage. Uterine atony remains the leading cause of postpartum hemorrhage, while birth canal laceration and placental factors are the second most common causes of postpartum hemorrhage in forceps delivery and cesarean section, respectively. In this study, the volumetric method, gravimetric method and area method were combined to quantitatively assess postpartum hemorrhage amount. The combined method has strong clinical practicability and is less affected by subjective factors, although it also has limitations. In the future, we still need to focus on the early prediction and identification of postpartum hemorrhage, and further improve the quantitative assessment of postpartum blood loss.

Postpartum hemorrhage is a significant contributor to maternal morbidity and mortality. We evaluated maternal and perinatal outcome of primary massive postpartum hemorrhage. In a restrospective case analysis of 33 women with intractable postpartum hemorrhage initially managed either by hysterectomy or a conservative approach in a tertiary referral center between January 1, 1991 to December 30, 1998, we reviewed the procedures used as a primary or secondary attempt to arrest the hemorrhage. Medical and surgical measures were successful in controlling hemorrhage in 21 (63.6%) of the 33 women. Hemorrhage was successfully arrested by conservative surgery in 13 cases, and by medical management in 8 cases. Emergency hysterectomy was performed in 12 cases (0.7 per 1000 deliveries) No maternal deaths occurred, but there were 2 early neonatal deaths (6.1 %). Atony of the uterus was the main cause of hemorrhage (n=15). Genital tract laceration was associated with a worse prognosis, but the time lapse between delivery and surgery appears to be the main prognostic factor. Uterine atony and morbid adherent placenta are major causes of massive obstetric hemorrhage. In our series, morbidity was high, but there was no mortality. Obstetricians should identify women at risk which is especially associated with a prior cesarean delivery, a current placenta previa and high parity. Early intervention and proper procedure could minimize the complications.

A double centre retrospective study into rates of postpartum haemorrhage in women on low molecular weight heparin

Postpartum hemorrhage (PPH) is a major cause of maternal mortality and morbidity worldwide. The purpose of this study was to evaluate if meconium-stained amniotic fluid (MSAF) is a risk factor for PPH after vaginal delivery. We retrospectively analyzed medical records of all patients who had a vaginal delivery at Fujian Provincial Maternity and Children's Hospital, between 1st January 2013 to 31st December 2018. Women with cesarean deliveries, multiple pregnancies, abnormal coagulation profile, and those with concomitant liver or kidney disorders were excluded. Patients were classified into MSAF (n=13686) and clear amniotic fluid (AF) (n=41511) groups. The incidence of PPH was significantly higher at 2.7% (370/13686) in the MSAF group as compared to 2.18% (904/41511) in the clear AF group (p=0.0004). There was no difference in the incidence of severe PPH between the two groups. Statistically significant difference in the incidence of PPH between MSAF and clear AF was seen in the maternal age groups of 30-34 and 35-39 years, gestational age>40weeks and >3 gravidity (p<0.05). Our study demonstrates that MSAF is a significant risk factor for minor and moderate PPH. Presence of meconium could therefore alert clinicians to expect PPH and make arrangements for further patient management. Further basic research is required to evaluate the mechanism by which meconium influences the incidence of PPH.

The Influence of Postpartum Hemorrhage on Patient Reported Outcomes Among Women with Von Willebrand Disease: The Pregnancy and Inherited Bleeding Disorders Study (PRIDES)

The Influence of Postpartum Hemorrhage on the Quality of Life Among Pregnant Hemophilia a and B Carriers: The Pregnancy and Inherited Bleeding Disorders Study (PRIDES)

Incidence, étiologies et facteurs de risque de l’hémorragie du post-partum : étude en population dans 106 maternités françaises

Épidémiologie de l’hémorragie du post-partum

BackgroundMost estimates of postpartum hemorrhage (PPH) are calculated from studies that use administrative or medical birth databases, and only a few from prospective observational studies.Our principal objective was to estimate the incidence of PPH according to their severity (mild or severe) in vaginal deliveries (>500 mL, ≥1000 mL) and cesareans (>1000 mL and ≥1500 mL). The secondary objectives were to describe the incidence of PPH according to maternity unit characteristics, causes, and types of PPH management.MethodsThis prospective observational study took place in French maternity wards. Women who gave birth at a term ≥ 22 weeks were eligible for the study. 182 maternity units participated in a study with prospective data collection from 1 February, 2011, to 31 July, 2011. The main outcome measure was PPH incidence.ResultsPPH incidence after vaginal delivery was 3.36 % [95 % CI: 3.25–3.47 %] and after cesareans 2.83 % [95 % CI: 2.63–3.04 %]. The incidence of severe PPH after vaginal delivery was 1.11 % [95 % CI: 1.05–1.18 %] and after cesareans 1.00 % [95 % CI: 0.88–1.13 %]. This incidence rate varied according to maternity unit characteristics. The principal cause of PPH for both modes of delivery was uterine atony (57.7 % for vaginal births and 66.3 % for cesareans). Vascular embolization was more frequent among women with cesareans (10.0 vs. 2.9 %), who also required transfusions more often (44.4 vs 12.7 %).ConclusionsThe incidence of PPH was lower than the rate expected from the literature. Effective treatment of uterine atony and optimizing the identification of blood loss remain important priorities.Electronic supplementary materialThe online version of this article (doi:10.1186/s12884-016-1008-7) contains supplementary material, which is available to authorized users.

Severe postpartum hemorrhage is an obstetric emergency that needs immediate intervention and is a leading cause of maternal death. Despite its significant health burden, little is known, about its magnitude and risk factors, especially after cesarean delivery in Ethiopia. This study aimed to evaluate the incidence and predictors of severe postpartum hemorrhage following cesarean section. This study was conducted on 728 women who underwent cesarean section. We retrospectively collected data from the medical records, including baseline characteristics, obstetrics, and perioperative data. Potential predictors were investigated using multivariate logistic regression analyses, adjusted odd ratios, and a 95% confidence interval to see associations. A p-value < 0.05 is considered statistically significant. The incidence of severe postpartum hemorrhage was 26 (3.6%). The independently associated factors were previous CS scar ≥ 2 (AOR 4.08: 95% CI 1.20–13.86), antepartum hemorrhage (AOR 2.89: 95% CI 1.01–8.16), severe preeclampsia (AOR 4.52: 95% CI 1.24–16.46), maternal age ≥ 35 years (AOR 2.77: 95% CI 1.02–7.52), general anesthesia (AOR 4.05: 95% CI 1.37–11.95) and classic incision (AOR 6.01: 95% CI 1.51–23.98). One in 25 women who gave birth during cesarean section experienced severe postpartum hemorrhage. Considering appropriate uterotonic agents and less invasive hemostatic interventions for high-risk mothers would help to decrease its overall rate and related morbidity.

BackgroundThe incidence of severe postpartum hemorrhage (PPH) is increasing. Regional variation may be attributed to variation in provision of care, and as such contribute to this increasing incidence. We assessed reasons for regional variation in severe PPH in the Netherlands.MethodsWe used the Netherlands Perinatal Registry and the Dutch Maternal Mortality Committee to study severe PPH incidences (defined as blood loss ≥ 1000 mL) across both regions and neighborhoods of cities among all deliveries between 2000 and 2008. We first calculated crude incidences. We then used logistic multilevel regression analyses, with hospital or midwife practice as second level to explore further reasons for the regional variation.ResultsWe analyzed 1599867 deliveries in which the incidence of severe PPH was 4.5%. Crude incidences of severe PPH varied with factor three between regions while between neighborhoods variation was even larger. We could not explain regional variation by maternal characteristics (age, parity, ethnicity, socioeconomic status), pregnancy characteristics (singleton, gestational age, birth weight, pre-eclampsia, perinatal death), medical interventions (induction of labor, mode of delivery, perineal laceration, placental removal) and health care setting.ConclusionsIn a nationwide study in The Netherlands, we observed wide practice variation in PPH. This variation could not be explained by maternal characteristics, pregnancy characteristics, medical interventions or health care setting. Regional variation is either unavoidable or subsequent to regional variation of a yet unregistered variable.Electronic supplementary materialThe online version of this article (doi:10.1186/s12884-015-0473-8) contains supplementary material, which is available to authorized users.

To investigate the incidence of severe postpartum haemorrhage among nulliparous women with a spontaneous onset of labour at term from 2000 to 2020. Population-based cohort study. National, using the Medical Birth Registry of Norway. Women (n = 330 244) who gave birth to their first singleton child in a cephalic presentation after a spontaneous onset of labour at term. Cross-tabulations and regression analysis with generalised linear models were used to assess time trends and adjust for potential confounding factors. We also stratified the analyses by maternal age groups, obstetric interventions, mode of delivery and institution size. Time trends were analysed using periods of 5 or 6 years as a unit, and the period from 2000 to 2004 was used as the reference. Severe postpartum haemorrhage (PPH) was defined as blood loss of >1500 mL within 24 h and/or in combination with blood transfusion. Severe PPH occurred in 7601/330 244 (2.30%) women. The incidence increased from 1.24% in 2000-2004 to 3.83% in 2015-2020 (adjusted relative risk, aRR 2.90; 95% CI 2.70-3.12). Changes in maternal characteristics or obstetric interventions did not explain the increase, and we found similar increases across institutions of all sizes. The incidence of severe PPH among nulliparous women increased almost threefold over 21 years. The current high incidence warrants urgent efforts to assess unknown risk factors, the health care provided and health system factors that may contribute to the increase, to inform improvements in care.