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Increased postpartum hemorrhage rates in Australia
J B Ford1, C L Roberts, J M Simpson
1Department of Obstetrics and Gynaecology, Northern Clinical School, University of Sydney, New South Wales, Australia. jford@med.usyd.edu.au
Summary
Rising postpartum hemorrhage (PPH) rates are not linked to changes in maternal risk factors. Increased PPH may stem from altered management or reporting practices, not evolving patient profiles.
Area of Science:
- Obstetrics and Gynecology
- Maternal Health
- Epidemiology
Background:
- Postpartum hemorrhage (PPH) remains a significant cause of maternal morbidity and mortality globally.
- Trends in maternal demographics and obstetric interventions have shifted over recent decades.
- Understanding the drivers of PPH rate changes is crucial for effective clinical management and public health strategies.
Purpose of the Study:
- To investigate the association between evolving risk factor profiles of women and observed trends in postpartum hemorrhage (PPH) rates.
- To determine if changes in patient characteristics explain the rise in PPH incidence over time.
Main Methods:
- A population-based study utilized linked hospital discharge and birth records from New South Wales, Australia (1994-2002).
- Data encompassed 752,374 childbirths, analyzing trends in risk factors and PPH rates.
- Regression analyses were performed to compare predicted versus observed PPH rates, adjusting for covariates.
Main Results:
- Significant increases were observed in maternal age (≥35 years), overseas-born status, nulliparity, cesarean births, labor induction/epidural use, postterm delivery, and macrosomia.
- Observed PPH rates increased from 4.7 to 6.0 per 100 births (P<0.001).
- However, expected PPH rates, adjusted for these changing risk factors, remained statistically stable (P=0.28).
Conclusions:
- The observed rise in postpartum hemorrhage rates cannot be attributed to the changing risk factor profile of the birthing population.
- Alternative explanations, such as modifications in clinical management protocols or changes in the reporting of PPH cases, are suggested.
- Further research into obstetric practice and documentation is warranted to elucidate the causes of increasing PPH incidence.
